Fetch translations from Transifex

ical4android: fix for events without dtend/duration

.gitlab-ci.yml

@@ -0,0 +1,21 @@
+image: registry.gitlab.com/bitfireat/davdroid:latest
+
+before_script:
+  - git submodule update --init --recursive
+  - export GRADLE_USER_HOME=`pwd`/.gradle; chmod +x gradlew
+  - emulator64-arm -avd test -no-skin -no-audio -no-window & wait-for-emulator.sh
+  - wget -q https://f-droid.org/repo/org.dmfs.tasks_103.apk && adb install org.dmfs.tasks_103.apk
+
+cache:
+  paths:
+     - .gradle/wrapper
+     - .gradle/caches
+
+test:
+  script:
+    - ./gradlew check mergeAndroidReports
+  artifacts:
+    paths:
+      - app/build/outputs/lint-results-debug.html
+      - app/build/reports
+      - build/reports

.gitmodules

@@ -1,13 +1,12 @@
 [submodule "dav4android"]
 	path = dav4android
-	url = https://gitlab.com/bitfireAT/dav4android.git
+	url = ../dav4android.git
 [submodule "ical4android"]
 	path = ical4android
-	url = https://gitlab.com/bitfireAT/ical4android.git
+	url = ../ical4android.git
 [submodule "vcard4android"]
 	path = vcard4android
-	url = https://gitlab.com/bitfireAT/vcard4android.git
-[submodule "MemorizingTrustManager"]
-	path = MemorizingTrustManager
-	url = https://github.com/ge0rg/MemorizingTrustManager
-	ignore = dirty
+	url = ../vcard4android.git
+[submodule "cert4android"]
+	path = cert4android
+	url = ../cert4android.git

README.md

@@ -1,4 +1,7 @@
 
+[![build status](https://gitlab.com/bitfireAT/davdroid/badges/master/build.svg)](https://gitlab.com/bitfireAT/davdroid/commits/master)
+
+
 DAVdroid
 ========
 
@@ -13,6 +16,7 @@ Help and discussion: [DAVdroid forums](https://davdroid.bitfire.at/forums)
 
 Parts of DAVdroid have been outsourced into these libraries:
 
+* [cert4android](https://gitlab.com/bitfireAT/cert4android) – custom certificate management
 * [dav4android](https://gitlab.com/bitfireAT/dav4android) – WebDAV/CalDav/CardDAV framework
 * [ical4android](https://gitlab.com/bitfireAT/ical4android) – iCalendar processing and Calendar Provider access
 * [vcard4android](https://gitlab.com/bitfireAT/vcard4android) – VCard processing and Contacts Provider access
@@ -28,7 +32,5 @@ Those libraries are used by DAVdroid (alphabetically):
 * [dnsjava](http://www.xbill.org/dnsjava/) – [BSD License](http://www.xbill.org/dnsjava/dnsjava-current/LICENSE)
 * [ez-vcard](https://code.google.com/p/ez-vcard/) – [New BSD License](http://opensource.org/licenses/BSD-3-Clause)
 * [iCal4j](http://ical4j.sourceforge.net/) – [New BSD License](http://sourceforge.net/p/ical4j/ical4j/ci/default/tree/LICENSE)
-* [MemorizingTrustManager](https://github.com/ge0rg/MemorizingTrustManager) – [MIT License](https://raw.githubusercontent.com/ge0rg/MemorizingTrustManager/master/LICENSE.txt)
 * [okhttp](https://square.github.io/okhttp/) – [Apache License, Version 2.0](https://square.github.io/okhttp/#license)
 * [Project Lombok](http://projectlombok.org/) – [MIT License](http://opensource.org/licenses/mit-license.php)
-* [SLF4J](http://www.slf4j.org/) – [MIT License](http://www.slf4j.org/license.html)

app/build.gradle

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013 – 2016 Ricki Hirner (bitfire web engineering).
+ * Copyright (c) Ricki Hirner (bitfire web engineering).
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the GNU Public License v3.0
  * which accompanies this distribution, and is available at
@@ -9,18 +9,56 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 23
-    buildToolsVersion '23.0.2'
+    compileSdkVersion 24
+    buildToolsVersion '24.0.3'
 
     defaultConfig {
         applicationId "at.bitfire.davdroid"
-        minSdkVersion 14
-        targetSdkVersion 22
-
-        versionCode 90
-        versionName "1.0"
+        resValue "string", "packageID", applicationId
 
+        versionCode 127
         buildConfigField "long", "buildTime", System.currentTimeMillis() + "L"
+
+        minSdkVersion 15
+        targetSdkVersion 24
+
+        buildConfigField "boolean", "customCerts", "false"
+        buildConfigField "at.bitfire.vcard4android.GroupMethod", "settingContactGroupMethod", "null"
+    }
+
+    productFlavors {
+        standard {
+            versionName "1.3.4"
+            buildConfigField "boolean", "customCerts", "true"
+        }
+        gplay {
+            versionName "1.3.4-gplay"
+            buildConfigField "boolean", "customCerts", "true"
+        }
+        icloud {
+            applicationId "at.bitfire.cloudsync"
+            resValue "string", "packageID", applicationId
+
+            versionName "1.3.4-cloud"
+            buildConfigField "at.bitfire.vcard4android.GroupMethod", "settingContactGroupMethod", "at.bitfire.vcard4android.GroupMethod.GROUP_VCARDS"
+        }
+    }
+
+    sourceSets {
+        standard.java.srcDirs = [ "src/davdroid/java" ]
+        standard.res.srcDirs = [ "src/davdroid/res" ]
+
+        gplay.java.srcDirs = [ "src/gplay/java", "src/davdroid/java" ]
+        gplay.res.srcDirs = [ "src/gplay/res", "src/davdroid/res" ]
+    }
+
+    signingConfigs {
+        bitfire {
+            keyAlias 'bitfire'
+            keyPassword '***REMOVED***'
+            storeFile file('/home/rfc2822/Entwicklung/GooglePlay/bitfire.jks')
+            storePassword '***REMOVED***'
+        }
     }
 
     buildTypes {
@@ -30,6 +68,7 @@ android {
         release {
             minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+            signingConfig signingConfigs.bitfire
         }
     }
 
@@ -40,8 +79,8 @@ android {
         disable 'IconColors'
         disable 'IconLauncherShape'
         disable 'IconMissingDensityFolder'
-        disable 'MissingTranslation'
-        disable 'OldTargetApi'      // Android 6 permission model not implemented yet
+        disable 'ImpliedQuantity', 'MissingQuantity'
+        disable 'MissingTranslation', 'ExtraTranslation'	// translations from Transifex are not always up to date
         disable 'Recycle'           // doesn't understand Lombok's @Cleanup
         disable 'RtlEnabled'
         disable 'RtlHardcoded'
@@ -52,28 +91,41 @@ android {
         exclude 'META-INF/LICENSE.txt'
         exclude 'META-INF/NOTICE.txt'
     }
-}
 
-configurations.all {
-    exclude module: 'commons-logging'       // undocumented part of Android
+    defaultConfig {
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
 }
 
 dependencies {
-    provided 'org.projectlombok:lombok:1.16.6'
-
+    compile project(':cert4android')
     compile project(':dav4android')
     compile project(':ical4android')
     compile project(':vcard4android')
 
-    compile 'com.android.support:appcompat-v7:23.+'
-    compile 'com.android.support:cardview-v7:23.+'
-    compile 'com.android.support:design:23.+'
-    compile 'com.android.support:preference-v7:23.+'
+    compile 'com.android.support:appcompat-v7:24.+'
+    compile 'com.android.support:cardview-v7:24.+'
+    compile 'com.android.support:design:24.+'
+    compile 'com.android.support:preference-v14:24.+'
 
     compile 'com.github.yukuku:ambilwarna:2.0.1'
-    compile project(':MemorizingTrustManager')
 
-    androidTestCompile 'com.squareup.okhttp3:mockwebserver:3.2.0'
+    compile 'com.squareup.okhttp3:logging-interceptor:3.4.1'
     compile 'dnsjava:dnsjava:2.1.7'
     compile 'org.apache.commons:commons-lang3:3.4'
+    compile 'org.apache.commons:commons-collections4:4.1'
+    provided 'org.projectlombok:lombok:1.16.10'
+
+    // for tests
+    androidTestCompile('com.android.support.test:runner:0.5') {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    }
+    androidTestCompile('com.android.support.test:rules:0.5') {
+        exclude group: 'com.android.support', module: 'support-annotations'
+    }
+    androidTestCompile 'junit:junit:4.12'
+    androidTestCompile 'com.squareup.okhttp3:mockwebserver:3.4.1'
+
+    testCompile 'junit:junit:4.12'
+    testCompile 'com.squareup.okhttp3:mockwebserver:3.4.1'
 }

app/proguard-rules.txt

@@ -1,36 +1,37 @@
 
 # ProGuard usage for DAVdroid:
-# 	shrinking		yes - main reason for using ProGuard
-# 	optimization		no - too risky
-# 	obfuscation		no - DAVdroid is open-source
-# 	preverification		no (Android default)
+#       shrinking        yes (main reason for using ProGuard)
+#       optimization     yes
+#       obfuscation      no (DAVdroid is open-source)
+#       preverification  no
 
 -dontobfuscate
 
+-optimizations !code/simplification/arithmetic,!code/simplification/cast,!field/*,!class/merging/*
+-optimizationpasses 5
+-allowaccessmodification
+-dontpreverify
+
 # ez-vcard
--dontwarn com.fasterxml.jackson.**		# Jackson JSON Processor (for jCards) not used
--dontwarn freemarker.**				# freemarker templating library (for creating hCards) not used
--dontwarn org.jsoup.**				# jsoup library (for hCard parsing) not used
+-dontwarn ezvcard.io.json.**            # JSON serializer (for jCards) not used
+-dontwarn freemarker.**                 # freemarker templating library (for creating hCards) not used
+-dontwarn org.jsoup.**                  # jsoup library (for hCard parsing) not used
 -dontwarn sun.misc.Perf
--keep class ezvcard.property.** { *; }		# keep all VCard properties (created at runtime)
+-keep class ezvcard.property.** { *; }  # keep all VCard properties (created at runtime)
 
 # ical4j: ignore unused dynamic libraries
 -dontwarn aQute.**
--dontwarn groovy.**				# Groovy-based ContentBuilder not used
+-dontwarn groovy.**                       # Groovy-based ContentBuilder not used
 -dontwarn org.codehaus.groovy.**
--dontwarn org.apache.commons.logging.**		# Commons logging is not available
--dontwarn net.fortuna.ical4j.model.**		# ignore warnings from Groovy dependency
--keep class net.fortuna.ical4j.model.** { *; }	# keep all model classes (properties/factories, created at runtime)
+-dontwarn net.fortuna.ical4j.model.**     # ignore warnings from Groovy dependency
+-keep class net.fortuna.ical4j.** { *; }  # keep all model classes (properties/factories, created at runtime)
 
 # okhttp
--dontwarn java.nio.file.**		# not available on Android
+-dontwarn java.nio.file.**   # not available on Android
 -dontwarn org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
 
-# MemorizingTrustManager
--dontwarn de.duenndns.ssl.MemorizingTrustManager
-
 # dnsjava
--dontwarn sun.net.spi.nameservice.**		# not available on Android
+-dontwarn sun.net.spi.nameservice.**   # not available on Android
 
 # DAVdroid + libs
--keep class at.bitfire.** { *; }	# all DAVdroid code is required
+-keep class at.bitfire.** { *; }       # all DAVdroid code is required

app/src/androidTest/java/at/bitfire/davdroid/ArrayUtilsTest.java

@@ -1,39 +0,0 @@
-/*
- * Copyright © 2013 – 2015 Ricki Hirner (bitfire web engineering).
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the GNU Public License v3.0
- * which accompanies this distribution, and is available at
- * http://www.gnu.org/licenses/gpl.html
- */
-package at.bitfire.davdroid;
-
-import junit.framework.TestCase;
-
-import java.util.Arrays;
-
-
-public class ArrayUtilsTest extends TestCase {
-	
-	public void testPartition() {
-		// n == 0
-		assertTrue(Arrays.deepEquals(
-				new Long[0][0],
-				ArrayUtils.partition(new Long[] { }, 5)));
-				
-		// n < max
-		assertTrue(Arrays.deepEquals(
-				new Long[][] { { 1l, 2l } },
-				ArrayUtils.partition(new Long[] { 1l, 2l }, 5)));
-		
-		// n == max
-		assertTrue(Arrays.deepEquals(
-				new Long[][] { { 1l, 2l }, { 3l, 4l } },
-				ArrayUtils.partition(new Long[] { 1l, 2l, 3l, 4l }, 2)));
-		
-		// n > max
-		assertTrue(Arrays.deepEquals(
-				new Long[][] { { 1l, 2l, 3l, 4l, 5l }, { 6l, 7l, 8l, 9l, 10l }, { 11l } },
-				ArrayUtils.partition(new Long[] { 1l, 2l, 3l, 4l, 5l, 6l, 7l, 8l, 9l, 10l, 11l }, 5)));
-	}
-	
-}

app/src/androidTest/java/at/bitfire/davdroid/SSLSocketFactoryCompatTest.java

@@ -9,36 +9,43 @@
 package at.bitfire.davdroid;
 
 import android.os.Build;
-import android.test.InstrumentationTestCase;
+import android.support.test.runner.AndroidJUnit4;
 
-import junit.framework.TestCase;
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
 
 import java.io.IOException;
 import java.net.Socket;
 
 import javax.net.ssl.SSLSocket;
 
-import de.duenndns.ssl.MemorizingTrustManager;
-import okhttp3.OkHttpClient;
+import at.bitfire.cert4android.CustomCertManager;
 import okhttp3.mockwebserver.MockWebServer;
 
-public class SSLSocketFactoryCompatTest extends InstrumentationTestCase {
+import static android.support.test.InstrumentationRegistry.getTargetContext;
+import static junit.framework.TestCase.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+public class SSLSocketFactoryCompatTest {
 
     SSLSocketFactoryCompat factory;
     MockWebServer server = new MockWebServer();
 
-    @Override
-    protected void setUp() throws Exception {
-        factory = new SSLSocketFactoryCompat(new MemorizingTrustManager(getInstrumentation().getTargetContext().getApplicationContext()));
+    @Before
+    public void startServer() throws Exception {
+        factory = new SSLSocketFactoryCompat(new CustomCertManager(getTargetContext().getApplicationContext(), true));
         server.start();
     }
 
-    @Override
-    protected void tearDown() throws Exception {
+    @After
+    public void stopServer() throws Exception {
         server.shutdown();
     }
 
 
+    @Test
     public void testUpgradeTLS() throws IOException {
         Socket s = factory.createSocket(server.getHostName(), server.getPort());
         assertTrue(s instanceof SSLSocket);

app/src/androidTest/java/at/bitfire/davdroid/TestConstants.java

@@ -1,27 +0,0 @@
-/*
- * Copyright © 2013 – 2015 Ricki Hirner (bitfire web engineering).
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the GNU Public License v3.0
- * which accompanies this distribution, and is available at
- * http://www.gnu.org/licenses/gpl.html
- */
-
-package at.bitfire.davdroid;
-
-import android.util.Log;
-
-import java.net.URI;
-import java.net.URISyntaxException;
-
-public class TestConstants {
-	public static final String ROBOHYDRA_BASE = "http://192.168.0.11:3000/";
-
-	public static URI roboHydra;
-	static {
-		try {
-			roboHydra = new URI(ROBOHYDRA_BASE);
-		} catch(URISyntaxException e) {
-			Log.wtf("davdroid.test.Constants", "Invalid RoboHydra base URL");
-		}
-	}
-}

app/src/androidTest/java/at/bitfire/davdroid/model/CollectionInfoTest.java

@@ -0,0 +1,119 @@
+/*
+ * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+package at.bitfire.davdroid.model;
+
+import android.content.ContentValues;
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.io.IOException;
+
+import at.bitfire.dav4android.DavResource;
+import at.bitfire.dav4android.exception.DavException;
+import at.bitfire.dav4android.exception.HttpException;
+import at.bitfire.dav4android.property.ResourceType;
+import at.bitfire.davdroid.HttpClient;
+import at.bitfire.davdroid.model.ServiceDB.Collections;
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+public class CollectionInfoTest {
+
+    MockWebServer server = new MockWebServer();
+
+    @Test
+    public void testFromDavResource() throws IOException, HttpException, DavException {
+        // r/w address book
+        server.enqueue(new MockResponse()
+                .setResponseCode(207)
+                .setBody("<multistatus xmlns='DAV:' xmlns:CARD='urn:ietf:params:xml:ns:carddav'>" +
+                        "<response>" +
+                        "   <href>/</href>" +
+                        "   <propstat><prop>" +
+                        "       <resourcetype><collection/><CARD:addressbook/></resourcetype>" +
+                        "       <displayname>My Contacts</displayname>" +
+                        "       <CARD:addressbook-description>My Contacts Description</CARD:addressbook-description>" +
+                        "   </prop></propstat>" +
+                        "</response>" +
+                        "</multistatus>"));
+
+        DavResource dav = new DavResource(HttpClient.create(null), server.url("/"));
+        dav.propfind(0, ResourceType.NAME);
+        CollectionInfo info = CollectionInfo.fromDavResource(dav);
+        assertEquals(CollectionInfo.Type.ADDRESS_BOOK, info.type);
+        assertFalse(info.readOnly);
+        assertEquals("My Contacts", info.displayName);
+        assertEquals("My Contacts Description", info.description);
+
+        // read-only calendar, no display name
+        server.enqueue(new MockResponse()
+                .setResponseCode(207)
+                .setBody("<multistatus xmlns='DAV:' xmlns:CAL='urn:ietf:params:xml:ns:caldav' xmlns:ICAL='http://apple.com/ns/ical/'>" +
+                        "<response>" +
+                        "   <href>/</href>" +
+                        "   <propstat><prop>" +
+                        "       <resourcetype><collection/><CAL:calendar/></resourcetype>" +
+                        "       <current-user-privilege-set><privilege><read/></privilege></current-user-privilege-set>" +
+                        "       <CAL:calendar-description>My Calendar</CAL:calendar-description>" +
+                        "       <CAL:calendar-timezone>tzdata</CAL:calendar-timezone>" +
+                        "       <ICAL:calendar-color>#ff0000</ICAL:calendar-color>" +
+                        "   </prop></propstat>" +
+                        "</response>" +
+                        "</multistatus>"));
+
+        dav = new DavResource(HttpClient.create(null), server.url("/"));
+        dav.propfind(0, ResourceType.NAME);
+        info = CollectionInfo.fromDavResource(dav);
+        assertEquals(CollectionInfo.Type.CALENDAR, info.type);
+        assertTrue(info.readOnly);
+        assertNull(info.displayName);
+        assertEquals("My Calendar", info.description);
+        assertEquals(0xFFFF0000, (int)info.color);
+        assertEquals("tzdata", info.timeZone);
+        assertTrue(info.supportsVEVENT);
+        assertTrue(info.supportsVTODO);
+    }
+
+    @Test
+    public void testFromDB() {
+        ContentValues values = new ContentValues();
+        values.put(Collections.ID, 1);
+        values.put(Collections.SERVICE_ID, 1);
+        values.put(Collections.URL, "http://example.com");
+        values.put(Collections.READ_ONLY, 1);
+        values.put(Collections.DISPLAY_NAME, "display name");
+        values.put(Collections.DESCRIPTION, "description");
+        values.put(Collections.COLOR, 0xFFFF0000);
+        values.put(Collections.TIME_ZONE, "tzdata");
+        values.put(Collections.SUPPORTS_VEVENT, 1);
+        values.put(Collections.SUPPORTS_VTODO, 1);
+        values.put(Collections.SYNC, 1);
+
+        CollectionInfo info = CollectionInfo.fromDB(values);
+        assertEquals(1, info.id);
+        assertEquals(1, (long)info.serviceID);
+        assertEquals("http://example.com", info.url);
+        assertTrue(info.readOnly);
+        assertEquals("display name", info.displayName);
+        assertEquals("description", info.description);
+        assertEquals(0xFFFF0000, (int)info.color);
+        assertEquals("tzdata", info.timeZone);
+        assertTrue(info.supportsVEVENT);
+        assertTrue(info.supportsVTODO);
+        assertTrue(info.selected);
+    }
+
+}

app/src/androidTest/java/at/bitfire/davdroid/resource/DavResourceFinderTest.java

@@ -1,90 +0,0 @@
-package at.bitfire.davdroid.resource;
-
-import android.test.InstrumentationTestCase;
-
-import java.io.IOException;
-import java.net.URI;
-
-import at.bitfire.dav4android.exception.DavException;
-import at.bitfire.dav4android.exception.HttpException;
-import at.bitfire.davdroid.ui.setup.DavResourceFinder;
-import at.bitfire.davdroid.ui.setup.LoginCredentials;
-import okhttp3.HttpUrl;
-import okhttp3.mockwebserver.MockResponse;
-import okhttp3.mockwebserver.MockWebServer;
-
-public class DavResourceFinderTest extends InstrumentationTestCase {
-
-    MockWebServer server = new MockWebServer();
-
-    @Override
-    protected void setUp() throws Exception {
-        server.start();
-    }
-
-    @Override
-    protected void tearDown() throws Exception {
-        server.shutdown();
-    }
-
-
-    public void testGetCurrentUserPrincipal() throws IOException, HttpException, DavException {
-        HttpUrl url = server.url("/dav");
-        LoginCredentials credentials = new LoginCredentials(url.uri(), "admin", "12345", true);
-        DavResourceFinder finder = new DavResourceFinder(getInstrumentation().getTargetContext().getApplicationContext(), credentials);
-
-        // positive test case
-        server.enqueue(new MockResponse()       // PROPFIND response
-                .setResponseCode(207)
-                .setHeader("Content-Type", "application/xml;charset=utf-8")
-                .setBody("<multistatus xmlns='DAV:'>" +
-                        "  <response>" +
-                        "    <href>/dav</href>" +
-                        "    <propstat>" +
-                        "      <prop>" +
-                        "        <current-user-principal><href>/principals/myself</href></current-user-principal>" +
-                        "      </prop>" +
-                        "      <status>HTTP/1.0 200 OK</status>" +
-                        "    </propstat>" +
-                        "  </response>" +
-                        "</multistatus>"));
-        server.enqueue(new MockResponse()       // OPTIONS response
-                .setResponseCode(200)
-                .setHeader("DAV", "addressbook"));
-        URI principal = finder.getCurrentUserPrincipal(url, DavResourceFinder.Service.CARDDAV);
-        assertEquals(url.resolve("/principals/myself").uri(), principal);
-
-        // negative test case: no current-user-principal
-        server.enqueue(new MockResponse()
-                .setResponseCode(207)
-                .setHeader("Content-Type", "application/xml;charset=utf-8")
-                .setBody("<multistatus xmlns='DAV:'>" +
-                        "  <response>" +
-                        "    <href>/dav</href>" +
-                      "      <status>HTTP/1.0 200 OK</status>" +
-                        "  </response>" +
-                        "</multistatus>"));
-        assertNull(finder.getCurrentUserPrincipal(url, DavResourceFinder.Service.CARDDAV));
-
-        // negative test case: requested service not available
-        server.enqueue(new MockResponse()       // PROPFIND response
-                .setResponseCode(207)
-                .setHeader("Content-Type", "application/xml;charset=utf-8")
-                .setBody("<multistatus xmlns='DAV:'>" +
-                        "  <response>" +
-                        "    <href>/dav</href>" +
-                        "    <propstat>" +
-                        "      <prop>" +
-                        "        <current-user-principal><href>/principals/myself</href></current-user-principal>" +
-                        "      </prop>" +
-                        "      <status>HTTP/1.0 200 OK</status>" +
-                        "    </propstat>" +
-                        "  </response>" +
-                        "</multistatus>"));
-        server.enqueue(new MockResponse()       // OPTIONS response
-                .setResponseCode(200)
-                .setHeader("DAV", "addressbook"));
-        assertNull(finder.getCurrentUserPrincipal(url, DavResourceFinder.Service.CALDAV));
-    }
-
-}

app/src/androidTest/java/at/bitfire/davdroid/ui/setup/DavResourceFinderTest.java

@@ -0,0 +1,206 @@
+/*
+ * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+package at.bitfire.davdroid.ui.setup;
+
+import android.support.test.runner.AndroidJUnit4;
+import android.test.InstrumentationTestCase;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import java.io.IOException;
+import java.net.URI;
+
+import at.bitfire.dav4android.DavResource;
+import at.bitfire.dav4android.exception.DavException;
+import at.bitfire.dav4android.exception.HttpException;
+import at.bitfire.dav4android.property.AddressbookHomeSet;
+import at.bitfire.dav4android.property.ResourceType;
+import at.bitfire.davdroid.App;
+import at.bitfire.davdroid.HttpClient;
+import at.bitfire.davdroid.ui.setup.DavResourceFinder;
+import at.bitfire.davdroid.ui.setup.DavResourceFinder.Configuration.ServiceInfo;
+import at.bitfire.davdroid.ui.setup.LoginCredentials;
+import okhttp3.OkHttpClient;
+import okhttp3.mockwebserver.Dispatcher;
+import okhttp3.mockwebserver.MockResponse;
+import okhttp3.mockwebserver.MockWebServer;
+import okhttp3.mockwebserver.RecordedRequest;
+
+import static android.support.test.InstrumentationRegistry.getTargetContext;
+import static junit.framework.TestCase.assertFalse;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNull;
+import static org.junit.Assert.assertTrue;
+
+public class DavResourceFinderTest {
+
+    MockWebServer server = new MockWebServer();
+
+    DavResourceFinder finder;
+    OkHttpClient client;
+    LoginCredentials credentials;
+
+    private static final String
+            PATH_NO_DAV = "/nodav",
+
+            PATH_CALDAV = "/caldav",
+            PATH_CARDDAV = "/carddav",
+            PATH_CALDAV_AND_CARDDAV = "/both-caldav-carddav",
+
+            SUBPATH_PRINCIPAL = "/principal",
+            SUBPATH_ADDRESSBOOK_HOMESET = "/addressbooks",
+            SUBPATH_ADDRESSBOOK = "/addressbooks/private-contacts";
+
+    @Before
+    public void initServerAndClient() throws Exception {
+        server.setDispatcher(new TestDispatcher());
+        server.start();
+
+        credentials = new LoginCredentials(URI.create("/"), "mock", "12345");
+        finder = new DavResourceFinder(getTargetContext(), credentials);
+
+        client = HttpClient.create(null);
+        client = HttpClient.addAuthentication(client, credentials.userName, credentials.password);
+    }
+
+    @After
+    public void stopServer() throws Exception {
+        server.shutdown();
+    }
+
+    @Test
+    public void testRememberIfAddressBookOrHomeset() throws IOException, HttpException, DavException {
+        ServiceInfo info;
+
+        // before dav.propfind(), no info is available
+        DavResource dav = new DavResource(client, server.url(PATH_CARDDAV + SUBPATH_PRINCIPAL));
+        finder.rememberIfAddressBookOrHomeset(dav, info = new ServiceInfo());
+        assertEquals(0, info.collections.size());
+        assertEquals(0, info.homeSets.size());
+
+        // recognize home set
+        dav.propfind(0, AddressbookHomeSet.NAME);
+        finder.rememberIfAddressBookOrHomeset(dav, info = new ServiceInfo());
+        assertEquals(0, info.collections.size());
+        assertEquals(1, info.homeSets.size());
+        assertEquals(server.url(PATH_CARDDAV + SUBPATH_ADDRESSBOOK_HOMESET + "/").uri(), info.homeSets.iterator().next());
+
+        // recognize address book
+        dav = new DavResource(client, server.url(PATH_CARDDAV + SUBPATH_ADDRESSBOOK));
+        dav.propfind(0, ResourceType.NAME);
+        finder.rememberIfAddressBookOrHomeset(dav, info = new ServiceInfo());
+        assertEquals(1, info.collections.size());
+        assertEquals(server.url(PATH_CARDDAV + SUBPATH_ADDRESSBOOK + "/").uri(), info.collections.keySet().iterator().next());
+        assertEquals(0, info.homeSets.size());
+    }
+
+    @Test
+    public void testProvidesService() throws IOException {
+        assertFalse(finder.providesService(server.url(PATH_NO_DAV), DavResourceFinder.Service.CALDAV));
+        assertFalse(finder.providesService(server.url(PATH_NO_DAV), DavResourceFinder.Service.CARDDAV));
+
+        assertTrue(finder.providesService(server.url(PATH_CALDAV), DavResourceFinder.Service.CALDAV));
+        assertFalse(finder.providesService(server.url(PATH_CALDAV), DavResourceFinder.Service.CARDDAV));
+
+        assertTrue(finder.providesService(server.url(PATH_CARDDAV), DavResourceFinder.Service.CARDDAV));
+        assertFalse(finder.providesService(server.url(PATH_CARDDAV), DavResourceFinder.Service.CALDAV));
+
+        assertTrue(finder.providesService(server.url(PATH_CALDAV_AND_CARDDAV), DavResourceFinder.Service.CALDAV));
+        assertTrue(finder.providesService(server.url(PATH_CALDAV_AND_CARDDAV), DavResourceFinder.Service.CARDDAV));
+    }
+
+    @Test
+    public void testGetCurrentUserPrincipal() throws IOException, HttpException, DavException {
+        assertNull(finder.getCurrentUserPrincipal(server.url(PATH_NO_DAV), DavResourceFinder.Service.CALDAV));
+        assertNull(finder.getCurrentUserPrincipal(server.url(PATH_NO_DAV), DavResourceFinder.Service.CARDDAV));
+
+        assertEquals(
+                server.url(PATH_CALDAV + SUBPATH_PRINCIPAL).uri(),
+                finder.getCurrentUserPrincipal(server.url(PATH_CALDAV), DavResourceFinder.Service.CALDAV)
+        );
+        assertNull(finder.getCurrentUserPrincipal(server.url(PATH_CALDAV), DavResourceFinder.Service.CARDDAV));
+
+        assertEquals(
+                server.url(PATH_CARDDAV + SUBPATH_PRINCIPAL).uri(),
+                finder.getCurrentUserPrincipal(server.url(PATH_CARDDAV), DavResourceFinder.Service.CARDDAV)
+        );
+        assertNull(finder.getCurrentUserPrincipal(server.url(PATH_CARDDAV), DavResourceFinder.Service.CALDAV));
+    }
+
+
+    // mock server
+
+    public class TestDispatcher extends Dispatcher {
+
+        @Override
+        public MockResponse dispatch(RecordedRequest rq) throws InterruptedException {
+            if (!checkAuth(rq)) {
+                MockResponse authenticate = new MockResponse().setResponseCode(401);
+                authenticate.setHeader("WWW-Authenticate", "Basic realm=\"test\"");
+                return authenticate;
+            }
+
+            String path = rq.getPath();
+
+            if ("OPTIONS".equalsIgnoreCase(rq.getMethod())) {
+                String dav = null;
+                if (path.startsWith(PATH_CALDAV))
+                    dav = "calendar-access";
+                else if (path.startsWith(PATH_CARDDAV))
+                    dav = "addressbook";
+                else if (path.startsWith(PATH_CALDAV_AND_CARDDAV))
+                    dav = "calendar-access, addressbook";
+                MockResponse response = new MockResponse().setResponseCode(200);
+                if (dav != null)
+                       response.addHeader("DAV", dav);
+                return response;
+
+            } else if ("PROPFIND".equalsIgnoreCase(rq.getMethod())) {
+                String props = null;
+                switch (path) {
+                    case PATH_CALDAV:
+                    case PATH_CARDDAV:
+                        props = "<current-user-principal><href>" + path + SUBPATH_PRINCIPAL + "</href></current-user-principal>";
+                        break;
+
+                    case PATH_CARDDAV + SUBPATH_PRINCIPAL:
+                        props = "<CARD:addressbook-home-set>" +
+                                "   <href>" + PATH_CARDDAV + SUBPATH_ADDRESSBOOK_HOMESET + "</href>" +
+                                "</CARD:addressbook-home-set>";
+                        break;
+                    case PATH_CARDDAV + SUBPATH_ADDRESSBOOK:
+                        props = "<resourcetype>" +
+                                "   <collection/>" +
+                                "   <CARD:addressbook/>" +
+                                "</resourcetype>";
+                        break;
+                }
+                App.log.info("Sending props: " + props);
+                return new MockResponse()
+                        .setResponseCode(207)
+                        .setBody("<multistatus xmlns='DAV:' xmlns:CARD='urn:ietf:params:xml:ns:carddav'>" +
+                                "<response>" +
+                                "   <href>" + rq.getPath() + "</href>" +
+                                "   <propstat><prop>" + props + "</prop></propstat>" +
+                                "</response>" +
+                                "</multistatus>");
+            }
+
+            return new MockResponse().setResponseCode(404);
+        }
+
+        private boolean checkAuth(RecordedRequest rq) {
+            return "Basic bW9jazoxMjM0NQ==".equals(rq.getHeader("Authorization"));
+        }
+    }
+
+}

app/src/davdroid/java/at/bitfire/davdroid/ui/DefaultAccountsDrawerHandler.java

@@ -0,0 +1,48 @@
+package at.bitfire.davdroid.ui;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.net.Uri;
+import android.support.annotation.NonNull;
+import android.view.MenuItem;
+
+import at.bitfire.davdroid.App;
+import at.bitfire.davdroid.BuildConfig;
+import at.bitfire.davdroid.Constants;
+import at.bitfire.davdroid.R;
+
+public class DefaultAccountsDrawerHandler implements IAccountsDrawerHandler {
+
+    @Override
+    public boolean onNavigationItemSelected(@NonNull Activity activity, MenuItem item) {
+        switch (item.getItemId()) {
+            case R.id.nav_about:
+                activity.startActivity(new Intent(activity, AboutActivity.class));
+                break;
+            case R.id.nav_app_settings:
+                activity.startActivity(new Intent(activity, AppSettingsActivity.class));
+                break;
+            case R.id.nav_twitter:
+                activity.startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://twitter.com/davdroidapp")));
+                break;
+            case R.id.nav_website:
+                activity.startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri));
+                break;
+            case R.id.nav_faq:
+                activity.startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("faq/").build()));
+                break;
+            case R.id.nav_forums:
+                activity.startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("forums/").build()));
+                break;
+            case R.id.nav_donate:
+                if (BuildConfig.FLAVOR != App.FLAVOR_GOOGLE_PLAY)
+                    activity.startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("donate/").build()));
+                break;
+	    default:
+                return false;
+        }
+
+        return true;
+    }
+
+}

app/src/davdroid/java/at/bitfire/davdroid/ui/setup/DefaultLoginCredentialsFragment.java

@@ -8,27 +8,33 @@
 
 package at.bitfire.davdroid.ui.setup;
 
+import android.app.Activity;
+import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
+import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
-import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.EditText;
 import android.widget.LinearLayout;
 import android.widget.RadioButton;
 
+import org.apache.commons.lang3.StringUtils;
+
 import java.net.IDN;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.util.logging.Level;
 
+import at.bitfire.dav4android.Constants;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.ui.widget.EditPassword;
 
-public class LoginCredentialsFragment extends Fragment implements CompoundButton.OnCheckedChangeListener {
+public class DefaultLoginCredentialsFragment extends Fragment implements CompoundButton.OnCheckedChangeListener {
 
     RadioButton radioUseEmail;
     LinearLayout emailDetails;
@@ -39,9 +45,9 @@ public class LoginCredentialsFragment extends Fragment implements CompoundButton
     LinearLayout urlDetails;
     EditText editBaseURL, editUserName;
     EditPassword editUrlPassword;
-    CheckBox checkPreemptiveAuth;
 
 
+    @Nullable
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         View v = inflater.inflate(R.layout.login_credentials_fragment, container, false);
@@ -56,13 +62,35 @@ public class LoginCredentialsFragment extends Fragment implements CompoundButton
         editBaseURL = (EditText)v.findViewById(R.id.base_url);
         editUserName = (EditText)v.findViewById(R.id.user_name);
         editUrlPassword = (EditPassword)v.findViewById(R.id.url_password);
-        checkPreemptiveAuth = (CheckBox)v.findViewById(R.id.preemptive_auth);
 
         radioUseEmail.setOnCheckedChangeListener(this);
         radioUseURL.setOnCheckedChangeListener(this);
 
-        if (savedInstanceState == null)
-            radioUseEmail.setChecked(true);
+        if (savedInstanceState == null) {
+            // first call
+
+            Activity activity = getActivity();
+            Intent intent = (activity != null) ? activity.getIntent() : null;
+            if (intent != null) {
+                // we've got initial login data
+                String  url = intent.getStringExtra(LoginActivity.EXTRA_URL),
+                        username = intent.getStringExtra(LoginActivity.EXTRA_USERNAME),
+                        password = intent.getStringExtra(LoginActivity.EXTRA_PASSWORD);
+
+                if (url != null) {
+                    radioUseURL.setChecked(true);
+                    editBaseURL.setText(url);
+                    editUserName.setText(username);
+                    editUrlPassword.setText(password);
+                } else {
+                    radioUseEmail.setChecked(true);
+                    editEmailAddress.setText(username);
+                    editEmailPassword.setText(password);
+                }
+
+            } else
+                radioUseEmail.setChecked(true);
+        }
 
         final Button login = (Button)v.findViewById(R.id.login);
         login.setOnClickListener(new View.OnClickListener() {
@@ -83,6 +111,7 @@ public class LoginCredentialsFragment extends Fragment implements CompoundButton
             boolean loginByEmail = buttonView == radioUseEmail;
             emailDetails.setVisibility(loginByEmail ? View.VISIBLE : View.GONE);
             urlDetails.setVisibility(loginByEmail ? View.GONE : View.VISIBLE);
+            (loginByEmail ? editEmailAddress : editBaseURL).requestFocus();
         }
     }
 
@@ -109,7 +138,7 @@ public class LoginCredentialsFragment extends Fragment implements CompoundButton
                 valid = false;
             }
 
-            return valid ? new LoginCredentials(uri, email, password, true) : null;
+            return valid ? new LoginCredentials(uri, email, password) : null;
 
         } else if (radioUseURL.isChecked()) {
             URI uri = null;
@@ -118,11 +147,16 @@ public class LoginCredentialsFragment extends Fragment implements CompoundButton
             Uri baseUrl = Uri.parse(editBaseURL.getText().toString());
             String scheme = baseUrl.getScheme();
             if ("https".equalsIgnoreCase(scheme) || "http".equalsIgnoreCase(scheme)) {
-                String host = IDN.toASCII(baseUrl.getHost());
-                if (host.isEmpty()) {
+                String host = baseUrl.getHost();
+                if (StringUtils.isEmpty(host)) {
                     editBaseURL.setError(getString(R.string.login_url_host_name_required));
                     valid = false;
-                }
+                } else
+                    try {
+                        host = IDN.toASCII(host);
+                    } catch(IllegalArgumentException e) {
+                        Constants.log.log(Level.WARNING, "Host name not conforming to RFC 3490", e);
+                    }
 
                 String path = baseUrl.getEncodedPath();
                 int port = baseUrl.getPort();
@@ -149,10 +183,20 @@ public class LoginCredentialsFragment extends Fragment implements CompoundButton
                 valid = false;
             }
 
-            return valid ? new LoginCredentials(uri, userName, password, checkPreemptiveAuth.isChecked()) : null;
+            return valid ? new LoginCredentials(uri, userName, password) : null;
         }
 
         return null;
     }
 
+
+    public static class Factory implements ILoginCredentialsFragment {
+
+        @Override
+        public Fragment getFragment() {
+            return new DefaultLoginCredentialsFragment();
+        }
+
+    }
+
 }

app/src/davdroid/res/drawable/ic_settings_action.xml

@@ -0,0 +1,5 @@
+<vector android:alpha="0.54" android:height="24dp"
+    android:viewportHeight="24.0" android:viewportWidth="24.0"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M19.43,12.98c0.04,-0.32 0.07,-0.64 0.07,-0.98s-0.03,-0.66 -0.07,-0.98l2.11,-1.65c0.19,-0.15 0.24,-0.42 0.12,-0.64l-2,-3.46c-0.12,-0.22 -0.39,-0.3 -0.61,-0.22l-2.49,1c-0.52,-0.4 -1.08,-0.73 -1.69,-0.98l-0.38,-2.65C14.46,2.18 14.25,2 14,2h-4c-0.25,0 -0.46,0.18 -0.49,0.42l-0.38,2.65c-0.61,0.25 -1.17,0.59 -1.69,0.98l-2.49,-1c-0.23,-0.09 -0.49,0 -0.61,0.22l-2,3.46c-0.13,0.22 -0.07,0.49 0.12,0.64l2.11,1.65c-0.04,0.32 -0.07,0.65 -0.07,0.98s0.03,0.66 0.07,0.98l-2.11,1.65c-0.19,0.15 -0.24,0.42 -0.12,0.64l2,3.46c0.12,0.22 0.39,0.3 0.61,0.22l2.49,-1c0.52,0.4 1.08,0.73 1.69,0.98l0.38,2.65c0.03,0.24 0.24,0.42 0.49,0.42h4c0.25,0 0.46,-0.18 0.49,-0.42l0.38,-2.65c0.61,-0.25 1.17,-0.59 1.69,-0.98l2.49,1c0.23,0.09 0.49,0 0.61,-0.22l2,-3.46c0.12,-0.22 0.07,-0.49 -0.12,-0.64l-2.11,-1.65zM12,15.5c-1.93,0 -3.5,-1.57 -3.5,-3.5s1.57,-3.5 3.5,-3.5 3.5,1.57 3.5,3.5 -1.57,3.5 -3.5,3.5z"/>
+</vector>

app/src/davdroid/res/layout/login_credentials_fragment.xml

@@ -94,13 +94,6 @@
                     android:layout_height="wrap_content"
                     android:hint="@string/login_password"/>
 
-                <CheckBox
-                    android:id="@+id/preemptive_auth"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:text="@string/login_auth_preemptive"
-                    android:checked="true"/>
-
             </LinearLayout>
 
         </RadioGroup>

app/src/davdroid/res/values-ca/strings.xml

@@ -10,12 +10,13 @@
   <!--DavService-->
   <!--AppSettingsActivity-->
   <!--AccountActivity-->
+  <!--PermissionsActivity-->
   <!--AddAccountActivity-->
   <string name="login_type_email">Entra amb una adreça de correu electrònic</string>
   <string name="login_type_url">Entra amb una URL i un nom d\'usuari</string>
-  <string name="login_auth_preemptive">Autentificació preferent (recomanat però incompatible amb l\'autentificació Digest)</string>
   <!--AccountSettingsActivity-->
   <!--collection management-->
   <!--ExceptionInfoFragment-->
   <!--sync errors and DebugInfoActivity-->
+  <!--cert4android-->
 </resources>

app/src/davdroid/res/values-cs/strings.xml

@@ -0,0 +1,246 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!--common strings-->
+  <string name="app_name">DAVdroid</string>
+  <string name="help">Pomoc</string>
+  <string name="manage_accounts">Spravovat účty</string>
+  <string name="please_wait">Chvíli strpení ...</string>
+  <string name="send">Odeslat</string>
+  <!--startup dialogs-->
+  <string name="startup_battery_optimization">Optimalizace využití baterie</string>
+  <string name="startup_battery_optimization_message">Android může po několika dnech vypnout/prodloužit interval synchronizování DAVdroid. Chcete-li tomuto zabránit, vypněte optimalizaci baterie.</string>
+  <string name="startup_battery_optimization_disable">Vypnout pro DAVdroid</string>
+  <string name="startup_dont_show_again">Již nezobrazovat</string>
+  <string name="startup_development_version">DAVdroid preview vydání</string>
+  <string name="startup_development_version_message">Toto je vývojová verze aplikace DAVdroid. Mějte na paměti, že vše nemusí správně fungovat. Budeme rádi za konstruktivní zpětnou vazbu, která pomůže vylepšit DAVdroid.</string>
+  <string name="startup_development_version_give_feedback">Dát zpětnou vazbu</string>
+  <string name="startup_donate">Open Source informace</string>
+  <string name="startup_donate_message">Jsme velice rádi že používáte DAVdroid, software s otevřeným zdrojovým kódem (GPLv3). Vývoj této aplikace je náročný a trval již několik tisíc hodin, velice nás potěší přispějete-li na jeho vývoj.</string>
+  <string name="startup_donate_now">Zobrazit stránku pro obdarování</string>
+  <string name="startup_donate_later">Možná později</string>
+  <string name="startup_google_play_accounts_removed">Informace o chybě DRM Obchodu Play</string>
+  <string name="startup_google_play_accounts_removed_message">Za určitých podmínek může dojít po restartu nebo aktualizaci aplikace DAVdroid k vymazání účtů kvůli chybě DRM Obchodu Play. Pokud jste postiženi touto chybou (ale pouze v tomto případě), nainstalujte prosím z Obchodu Play aplikaci \"DAVdroid JB Workaround\".</string>
+  <string name="startup_google_play_accounts_removed_more_info">Více informací</string>
+  <string name="startup_opentasks_not_installed">OpenTasks není nainstalován</string>
+  <string name="startup_opentasks_not_installed_message">Aplikace OpenTasks není dostupná, proto nebude DAVdroid moci synchronizovat seznam úkolů.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Po instalaci OpenTasks musíte PŘEINSTALOVAT DAVdroid a přidat znovu své účty (Android chyba).</string>
+  <string name="startup_opentasks_not_installed_install">Nainstalovat OpenTasks</string>
+  <!--AboutActivity-->
+  <string name="about_license_terms">Licenční podmínky</string>
+  <string name="about_license_info_no_warranty">Tento program je distribuován BEZ JAKÉKOLIV ZÁRUKY. Je to volně dostupný software a lze jej za určitých podmínek dále distribuovat.</string>
+  <!--global settings-->
+  <string name="logging_davdroid_file_logging">DAVdroid logování do souboru</string>
+  <string name="logging_to_external_storage">Logování do externího úložiště: %s</string>
+  <string name="logging_to_external_storage_warning">Smazat logy jak nejdříve možno!</string>
+  <string name="logging_couldnt_create_file">Nelze vytvořit externí soubor logu: %s</string>
+  <string name="logging_no_external_storage">Externí úložiště nenalezeno</string>
+  <!--AccountsActivity-->
+  <string name="navigation_drawer_open">Otevřít panel navigace</string>
+  <string name="navigation_drawer_close">Zavřít panel navigace</string>
+  <string name="navigation_drawer_subtitle">CalDAV/CardDAV adapter synchronizace</string>
+  <string name="navigation_drawer_about">O aplikaci / Licence</string>
+  <string name="navigation_drawer_settings">Nastavení</string>
+  <string name="navigation_drawer_news_updates">Novinky &amp; aktualizace</string>
+  <string name="navigation_drawer_external_links">Externí odkazy</string>
+  <string name="navigation_drawer_website">Webová stránka</string>
+  <string name="navigation_drawer_faq">FAQ</string>
+  <string name="navigation_drawer_forums">Komunita</string>
+  <string name="navigation_drawer_donate">Obdarovat</string>
+  <string name="account_list_empty">Vítejte v aplikaci DAVdroid!\n\nNyní můžete přidat CalDAV/CardDAV účet.</string>
+  <!--DavService-->
+  <string name="dav_service_refresh_failed">Vyhledání služby selhalo</string>
+  <string name="dav_service_refresh_couldnt_refresh">Nelze obnovit seznam sbírky</string>
+  <!--AppSettingsActivity-->
+  <string name="app_settings">Nastavení</string>
+  <string name="app_settings_user_interface">Uživatelské prostředí</string>
+  <string name="app_settings_reset_hints">Resetovat nápovědu</string>
+  <string name="app_settings_reset_hints_summary">Znovu povolí vypnuté texty nápovědy</string>
+  <string name="app_settings_reset_hints_success">Budou zobrazovány všechny texty nápovědy</string>
+  <string name="app_settings_connection">Připojení</string>
+  <string name="app_settings_override_proxy">Přepsat proxy nastavení</string>
+  <string name="app_settings_override_proxy_on">Použít vlastní proxy nastavení</string>
+  <string name="app_settings_override_proxy_off">Použít výchozí systémová proxy nastavení</string>
+  <string name="app_settings_override_proxy_host">HTTP proxy hostname</string>
+  <string name="app_settings_override_proxy_port">HTTP proxy port</string>
+  <string name="app_settings_security">Zabezpečení</string>
+  <string name="app_settings_distrust_system_certs">Nedůvěřovat systémovým certifikátům</string>
+  <string name="app_settings_distrust_system_certs_on">Systémovým a uživatelem přidaným CA nebude důvěřováno</string>
+  <string name="app_settings_distrust_system_certs_off">Systémovým a uživatelem přidaným CA bude důvěřováno (doporučeno)</string>
+  <string name="app_settings_reset_certificates">Resetovat (ne)důvěryhodné certifikáty</string>
+  <string name="app_settings_reset_certificates_summary">Resetovat důvěryhodnost všech vlastních certifikátů</string>
+  <string name="app_settings_reset_certificates_success">Všechny vlastní certifikáty byly resetovány</string>
+  <string name="app_settings_debug">Ladění</string>
+  <string name="app_settings_log_to_external_storage">Logovat do externího souboru</string>
+  <string name="app_settings_log_to_external_storage_on">Logování do externího úložiště (pokud dostupné)</string>
+  <string name="app_settings_log_to_external_storage_off">Logování do externího souboru je vypnuto</string>
+  <string name="app_settings_show_debug_info">Zobrazit ladící informace</string>
+  <string name="app_settings_show_debug_info_details">Zobrazit/sdílet software a detaily konfigurace</string>
+  <!--AccountActivity-->
+  <string name="account_synchronize_now">Synchronizovat nyní</string>
+  <string name="account_synchronizing_now">Probíhá synchronizace</string>
+  <string name="account_settings">Nastavení účtu</string>
+  <string name="account_delete">Smazat účet</string>
+  <string name="account_delete_confirmation_title">Opravdu smazat účet?</string>
+  <string name="account_delete_confirmation_text">Všechny místní kopie adresáře, kalendářů a úkolů budou smazány.</string>
+  <string name="account_refresh_address_book_list">Obnovit seznam adresářů</string>
+  <string name="account_create_new_address_book">Vytvořit nový adresář</string>
+  <string name="account_refresh_calendar_list">Obnovit seznam kalendářů</string>
+  <string name="account_create_new_calendar">Vytvořit nový kalendář</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">DAVdroid oprávnění</string>
+  <string name="permissions_calendar">Oprávnění pro kalendáře</string>
+  <string name="permissions_calendar_details">Pro synchronizaci CalDAV událostí s místním kalendářem potřebuje DAVdroid oprávnění přistupovat ke kalendářům.</string>
+  <string name="permissions_calendar_request">Vyžádat oprávnění kalendáře</string>
+  <string name="permissions_contacts">Oprávnění pro kontakty</string>
+  <string name="permissions_contacts_details">Pro synchronizaci CardDAV adresářů s místními kontakty potřebuje DAVdroid oprávnění přistupovat ke kontaktům.</string>
+  <string name="permissions_contacts_request">Vyžádat oprávnění kontaktů</string>
+  <string name="permissions_opentasks">Oprávnění pro OpenTasks</string>
+  <string name="permissions_opentasks_details">Pro synchronizaci CalDAV událostí s místním seznamem úkolů potřebuje DAVdroid oprávnění přistupovat k OpenTasks.</string>
+  <string name="permissions_opentasks_request">Vyžádat oprávnění OpenTasks</string>
+  <!--AddAccountActivity-->
+  <string name="login_title">Přidat účet</string>
+  <string name="login_type_email">Přihlášení s emailovou adresou</string>
+  <string name="login_email_address">Emailová adresa</string>
+  <string name="login_email_address_error">Vyžadován platný email</string>
+  <string name="login_password">Heslo</string>
+  <string name="login_password_required">Vyžadováno heslo</string>
+  <string name="login_type_url">Přihlášení s URL a uživatelským jménem</string>
+  <string name="login_url_must_be_http_or_https">URL musí začínat na http(s)://</string>
+  <string name="login_url_host_name_required">Vyžadováno hostname</string>
+  <string name="login_user_name">Uživatelské jméno</string>
+  <string name="login_user_name_required">Vyžadováno uživatelské jméno</string>
+  <string name="login_base_url">Základní URL</string>
+  <string name="login_login">Login</string>
+  <string name="login_back">Zpět</string>
+  <string name="login_create_account">Vytvořit účet</string>
+  <string name="login_account_name">Jméno účtu</string>
+  <string name="login_account_name_info">Pro jméno účtu použijte svou emailovou adresu, protože Android bude brát jméno účtu jako údaj pro ORGANIZÁTORA vytvořených událostí. Nelze mít dva účty stejného jména.</string>
+  <string name="login_account_contact_group_method">Metoda seskupování kontaktů:</string>
+  <string name="login_account_name_required">Vyžadováno jméno účtu</string>
+  <string name="login_account_not_created">Účet nelze vytvořit</string>
+  <string name="login_configuration_detection">Vyhledání konfigurace</string>
+  <string name="login_querying_server">Chvíli strpení, probíhá dotazování serveru...</string>
+  <string name="login_no_caldav_carddav">Nelze nalézt službu CalDAV nebo CardDAV.</string>
+  <string name="login_view_logs">Prohlížet logy</string>
+  <!--AccountSettingsActivity-->
+  <string name="settings_title">Nastavení: %s</string>
+  <string name="settings_authentication">Ověření</string>
+  <string name="settings_username">Uživatelské jméno</string>
+  <string name="settings_enter_username">Zadat uživatelské jméno</string>
+  <string name="settings_password">Heslo</string>
+  <string name="settings_password_summary">Aktualizovat heslo dle svého serveru.</string>
+  <string name="settings_enter_password">Vložit své heslo:</string>
+  <string name="settings_sync">Synchronizace</string>
+  <string name="settings_sync_interval_contacts">Interval synchronizace kontaktů</string>
+  <string name="settings_sync_summary_manually">Pouze manuálně</string>
+  <string name="settings_sync_summary_periodically" tools:ignore="PluralsCandidate">Každých %d minut a ihned při lokálních změnách</string>
+  <string name="settings_sync_summary_not_available">Nedostupný</string>
+  <string name="settings_sync_interval_calendars">Interval synchronizace kalendáře</string>
+  <string name="settings_sync_interval_tasks">Interval synchronizace úkolů</string>
+  <string-array name="settings_sync_interval_seconds">
+    <item>-1</item>
+    <item>300</item>
+    <item>600</item>
+    <item>900</item>
+    <item>3600</item>
+    <item>7200</item>
+    <item>14400</item>
+    <item>86400</item>
+  </string-array>
+  <string-array name="settings_sync_interval_names">
+    <item>Pouze manuálně</item>
+    <item>Každých 5 minut</item>
+    <item>Každých 10 minut</item>
+    <item>Každých 15 minut</item>
+    <item>Každou hodinu</item>
+    <item>Každé 2 hodiny</item>
+    <item>Každé 4 hodiny</item>
+    <item>Jednou za den</item>
+  </string-array>
+  <string name="settings_sync_wifi_only">Synchronizovat pouze přes WiFi</string>
+  <string name="settings_sync_wifi_only_on">Synchronizace omezena na WiFi připojení</string>
+  <string name="settings_sync_wifi_only_off">Druh připojení není brán v potaz</string>
+  <string name="settings_sync_wifi_only_ssid">Omezení WiFi SSID</string>
+  <string name="settings_sync_wifi_only_ssid_on">Synchronizace pouze přes %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Použít všechna WiFi připojení</string>
+  <string name="settings_sync_wifi_only_ssid_message">Zadejte jméno WiFi sítě (SSID) pro omezení synchronizace na tutu síť, nebo ponechte prázdné pro použití všech WiFi připojení.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">Metoda seskupování kontaktů</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>Skupiny jsou oddělené soubory VCard</item>
+    <item>Skupiny jsou kategorie na kontakt</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
+  <string name="settings_sync_time_range_past">Časový limit pro staré události</string>
+  <string name="settings_sync_time_range_past_none">Synchronizovat všechny události</string>
+  <plurals name="settings_sync_time_range_past_days">
+    <item quantity="one">Ignorovat události starší než 1 den</item>
+    <item quantity="few">Ignorovat události starší než %d dny</item>
+    <item quantity="other">Ignorovat události starší než %d dnů</item>
+  </plurals>
+  <string name="settings_sync_time_range_past_message">Události z minulosti starší než vyznačený počet dnů budou ignorovány (lze zadat 0). Ponechte prázdné pro synchronizaci všech událostí.</string>
+  <string name="settings_manage_calendar_colors">Spravovat barvy kalendářů</string>
+  <string name="settings_manage_calendar_colors_on">Barvy kalendářů spravuje DAVdroid</string>
+  <string name="settings_manage_calendar_colors_off">Barvy kalendářů nespravuje DAVdroid</string>
+  <string name="settings_version_update">Aktualizace verze DAVdroid</string>
+  <string name="settings_version_update_settings_updated">Vnitřní nastavení byla aktualizována.</string>
+  <string name="settings_version_update_install_hint">Při problémech odinstalujte a znovu nainstalujte DAVdroid.</string>
+  <!--collection management-->
+  <string name="create_addressbook">Vytvořit adresář</string>
+  <string name="create_addressbook_display_name_hint">Můj adresář</string>
+  <string name="create_calendar">Vytvořit CalDAV sbírku</string>
+  <string name="create_calendar_display_name_hint">Můj kalendář</string>
+  <string name="create_calendar_time_zone">Časová zóna:</string>
+  <string name="create_calendar_type">Typ sbírky:</string>
+  <string name="create_calendar_type_only_events">Kalendář (pouze události)</string>
+  <string name="create_calendar_type_only_tasks">Seznam úkolů (pouze úkoly)</string>
+  <string name="create_calendar_type_events_and_tasks">Kombinovaná (události a úkoly)</string>
+  <string name="create_collection_color">Nastavit barvu sbírky</string>
+  <string name="create_collection_creating">Vytváření sbírky</string>
+  <string name="create_collection_display_name">Zobrazit jméno (nadpis) této sbírky:</string>
+  <string name="create_collection_display_name_required">Nadpis je vyžadován</string>
+  <string name="create_collection_description">Popis (volitelný):</string>
+  <string name="create_collection_home_set">Domácí sbírka:</string>
+  <string name="create_collection_create">Vytvořit</string>
+  <string name="delete_collection">Smazat sbírku</string>
+  <string name="delete_collection_confirm_title">Jste si jisti?</string>
+  <string name="delete_collection_confirm_warning">Tato sbírka (%s) a všechna její data budou odstraněna ze serveru.</string>
+  <string name="delete_collection_deleting_collection">Mazání sbírky</string>
+  <!--ExceptionInfoFragment-->
+  <string name="exception">Došlo k chybě.</string>
+  <string name="exception_httpexception">Došlo k HTTP chybě.</string>
+  <string name="exception_ioexception">Došlo k I/O chybě.</string>
+  <string name="exception_show_details">Zobrazit detaily</string>
+  <!--sync errors and DebugInfoActivity-->
+  <string name="debug_info_title">Ladící informace</string>
+  <string name="sync_error_permissions">DAVdroid oprávnění</string>
+  <string name="sync_error_permissions_text">Vyžadována dodatečná oprávnění</string>
+  <string name="sync_error_calendar">Synchronizace kalendáře selhala (%s)</string>
+  <string name="sync_error_contacts">Synchronizace adresáře selhala (%s)</string>
+  <string name="sync_error_tasks">Synchronizace úkolu selhala (%s)</string>
+  <string name="sync_error">Chyba při %s</string>
+  <string name="sync_error_http_dav">Chyba serveru při %s</string>
+  <string name="sync_error_local_storage">Chyba databáze při %s</string>
+  <string-array name="sync_error_phases">
+    <item>příprava synchronizace</item>
+    <item>dotazování možností</item>
+    <item>zpracovávání místně smazaných záznamů</item>
+    <item>příprava vytvořených/upravených záznamů</item>
+    <item>nahrávání vytvořených/upravených záznamů</item>
+    <item>kontrola stavu synchronizace</item>
+    <item>výpis místních záznamů</item>
+    <item>výpis vzdálených záznamů</item>
+    <item>porovnání místních/vzdálených záznamů</item>
+    <item>stahování vzdálených záznamů</item>
+    <item>uzavírání procesu</item>
+    <item>ukládání stavu synchronizace</item>
+  </string-array>
+  <string name="sync_error_unauthorized">Chybné uživatelské jméno/heslo</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: Zabezpečení připojení</string>
+  <string name="trust_certificate_unknown_certificate_found">DAVdroid nalezl neznámý certifikát. Chcete mu důvěřovat?</string>
+</resources>

app/src/davdroid/res/values-da/strings.xml

@@ -19,7 +19,8 @@
   <string name="startup_google_play_accounts_removed_message">Under visse tekniske omstændigheder kan DRM fra Play Store bevirke, at alle DAVdroid-konti er væk efter en genstart eller opgradering af DAVdroid. Hvis du er udsat for dette problem (og ellers ikke), opfordres du til at installere DAVDroid JB Workaround\" fra Play Store.</string>
   <string name="startup_google_play_accounts_removed_more_info">Yderligere oplysninger</string>
   <string name="startup_opentasks_not_installed">OpenTasks ikke installeret</string>
-  <string name="startup_opentasks_not_installed_message">OpenTasks-app\'en er ikke installeret eller kan ikke tilgås, så DAVdroid vil ikke være i stand til at opdatere opgavelister. Geninstaller DAVdroid og tilføj dine konti igen efter installation af OpenTasks.</string>
+  <string name="startup_opentasks_not_installed_message">OpenTasks er ikke til rådighedm så DAVdroid vil ikke kunne synkronisere opgavelister.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Efter at have installeret OpenTasks, vil du være nødt til at GENINSTALLERE DAVdroid og dine konti igen (en fejl i Android).</string>
   <string name="startup_opentasks_not_installed_install">Installer OpenTasks</string>
   <!--AboutActivity-->
   <string name="about_license_terms">Licensforhold</string>
@@ -53,12 +54,6 @@
   <string name="app_settings_reset_hints_summary">Genaktiverer hjælp, som er blevet lukket tidligere</string>
   <string name="app_settings_reset_hints_success">Al vejledning vil blive vist igen</string>
   <string name="app_settings_security">Sikkerhed</string>
-  <string name="app_settings_reset_trusted_certificates">Nulstil verificerede certifikater</string>
-  <string name="app_settings_reset_trusted_certificates_summary">Glemmer alle certifikater, der er blevet godkendt tidligere</string>
-  <plurals name="app_settings_reset_trusted_certificates_success">
-    <item quantity="one">Ikke-accepteret certifikat</item>
-    <item quantity="other">%d kke-accepterede certifikater</item>
-  </plurals>
   <string name="app_settings_debug">Debugging</string>
   <string name="app_settings_log_to_external_storage">Log til ekstern fil</string>
   <string name="app_settings_log_to_external_storage_on">Logger til eksternt lager (hvis muligt)</string>
@@ -76,6 +71,17 @@
   <string name="account_create_new_address_book">Opret ny adressebog</string>
   <string name="account_refresh_calendar_list">Opdater kalenderliste</string>
   <string name="account_create_new_calendar">Opret ny kalender</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">DAVdroid adgangsrettigheder</string>
+  <string name="permissions_calendar">Kalenderadgange</string>
+  <string name="permissions_calendar_details">For at synkronisere CalDAV-begivenheder med dine lokale kalendere, skal DAVdroid have adgang til dine kalendere.</string>
+  <string name="permissions_calendar_request">Anmod om kalenderadgang</string>
+  <string name="permissions_contacts">Kontakter: Adgangsrettigheder</string>
+  <string name="permissions_contacts_details">DAVdroid er nødt til at have adgang til dine kontakter, hvis CardDAV-adressebøger skal kunne synkronisere med dine kontakter.</string>
+  <string name="permissions_contacts_request">Anmod om adgang til kontakter</string>
+  <string name="permissions_opentasks">OpenTasks: Adgangsrettigheder</string>
+  <string name="permissions_opentasks_details">DAVdroid er nødt til at have adgang til OpenTasks, hvis CalDAV-opgaver skal kunne synkronisere med dine lokale opgavelister.</string>
+  <string name="permissions_opentasks_request">Anmod om adgang til OpenTasks</string>
   <!--AddAccountActivity-->
   <string name="login_title">Tilføj konto</string>
   <string name="login_type_email">Log ind med emailadresse</string>
@@ -89,12 +95,12 @@
   <string name="login_user_name">Brugernavn</string>
   <string name="login_user_name_required">Brugernavn påkrævet</string>
   <string name="login_base_url">Basis-URL</string>
-  <string name="login_auth_preemptive">Forhåndsgodkendelse (preemptive authentication - anbefalet, men ikke kompatiblelt med Digest auth)</string>
   <string name="login_login">Login</string>
   <string name="login_back">Tilbage</string>
   <string name="login_create_account">Opret konto</string>
   <string name="login_account_name">Kontonavn</string>
   <string name="login_account_name_info">Brug emailadressen som kontonavn, for Android vil bruge kontonavnet til ORGANIZER-feltet for aktiviteter, som du opretter. Du kan ikke have to konti med samme navn.</string>
+  <string name="login_account_contact_group_method">Gruppering af kontakter:</string>
   <string name="login_account_name_required">Kontonavn påkrævet</string>
   <string name="login_account_not_created">Konto kunne ikke oprettes</string>
   <string name="login_configuration_detection">Check konfiguration</string>
@@ -109,9 +115,6 @@
   <string name="settings_password">Adgangskode</string>
   <string name="settings_password_summary">Opdater adgangskoden, så den svarer til din server.</string>
   <string name="settings_enter_password">Indtast adgangskode:</string>
-  <string name="settings_preemptive">Forhåndsgodkendelse</string>
-  <string name="settings_preemptive_on">Loginoplysninger sendes ved hver anmodning (anbefalet)</string>
-  <string name="settings_preemptive_off">Loginoplysninger sendes efter server anmoder om dem</string>
   <string name="settings_sync">Synkronisering</string>
   <string name="settings_sync_interval_contacts">Synkroniseringsinterval for kontakter</string>
   <string name="settings_sync_summary_manually">Kun manuelt</string>
@@ -139,6 +142,24 @@
     <item>En gang hver 4. time</item>
     <item>En gang om dagen</item>
   </string-array>
+  <string name="settings_sync_wifi_only">Synkroniser kun over WiFi</string>
+  <string name="settings_sync_wifi_only_on">Synkronisering er begrænset til WiFi-forbindelser</string>
+  <string name="settings_sync_wifi_only_off">Forbindelsestypen har ingen betydning</string>
+  <string name="settings_sync_wifi_only_ssid">Begræsning til WiFi-SSID</string>
+  <string name="settings_sync_wifi_only_ssid_on">Vil kun blive synkroniseret over %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Alle WiFi-forbindelse vil kunne bruges</string>
+  <string name="settings_sync_wifi_only_ssid_message">Indtast navnet på et WiFi-netværk (SSID) for at begrænse synkronisering til dette netværk, eller efterlad feltet blank for at acceptere alle WiFi-forbindelser.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">Gruppering af kontakter</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>Grupper er særskilte VCards</item>
+    <item>Grupper er kategorier pr. kontakt</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
   <string name="settings_sync_time_range_past">Tidsafgrænsning for tidligere begivenheder</string>
   <string name="settings_sync_time_range_past_none">Alle begivenheder vil blive synkroniseret</string>
   <plurals name="settings_sync_time_range_past_days">
@@ -146,6 +167,9 @@
     <item quantity="other">Begivenheder, der er mere end %d dage gamle, vil blive ignoreret</item>
   </plurals>
   <string name="settings_sync_time_range_past_message">Begivenheder, som er mere end dette antal dage gamle vil blive ignoreret (kan også være 0). Hvis feltet ikke er udfyldt, vil alle begivenheder blive synkroniseret.</string>
+  <string name="settings_manage_calendar_colors">Administrer farver for kalender</string>
+  <string name="settings_manage_calendar_colors_on">Kalenderfarver administreres af DAVdroid</string>
+  <string name="settings_manage_calendar_colors_off">Kalenderfarver sættes ikke fra DAVdroid</string>
   <string name="settings_version_update">Versionsopdatering af DAVdroid</string>
   <string name="settings_version_update_settings_updated">Interne indstillinger er blevet opdateret.</string>
   <string name="settings_version_update_install_hint">Problemer? Afinstaller DAVdroid og geninstaller.</string>
@@ -177,6 +201,8 @@
   <string name="exception_show_details">Vis detaljer</string>
   <!--sync errors and DebugInfoActivity-->
   <string name="debug_info_title">Debug-info</string>
+  <string name="sync_error_permissions">DAVdroid-rettigheder</string>
+  <string name="sync_error_permissions_text">Yderligere adgang påkrævet</string>
   <string name="sync_error_calendar">Synkronisering af kalenderen lykkedes ikke (%s)</string>
   <string name="sync_error_contacts">Synkronisering af adressebogen lykkedes ikke (%s)</string>
   <string name="sync_error_tasks">Synkronisering af opgaver lykkedes ikke (%s)</string>
@@ -185,16 +211,18 @@
   <string name="sync_error_local_storage">Databasefejl under %s</string>
   <string-array name="sync_error_phases">
     <item>forbereder synkronisering</item>
-    <item>checker funktioner</item>
+    <item>checker understøttelse</item>
     <item>behandler poster, der er slettet lokalt</item>
-    <item>behandler poster, der er oprettet/ændret lokalt</item>
-    <item>uploader poster, der er oprettet/ændret lokalt</item>
+    <item>behandler poster, der er blevet oprettet/redigeret</item>
+    <item>uploader poster, der er blevet oprettet/redigeret</item>
     <item>checker synkroniseringsstatus</item>
-    <item>oplister lokale poster</item>
-    <item>oplister poster på server</item>
+    <item>laver liste af lokale poster</item>
+    <item>laver lister af poster på server</item>
     <item>sammenligner poster lokalt og på server</item>
     <item>downloader poster på server</item>
+    <item>efterbehandler</item>
     <item>gemmer synkroniseringsstatus</item>
   </string-array>
   <string name="sync_error_unauthorized">Fejl i brugernavn/adgangskode</string>
+  <!--cert4android-->
 </resources>

app/src/davdroid/res/values-es/strings.xml

@@ -7,7 +7,11 @@
   <string name="please_wait">Por favor, espere...</string>
   <string name="send">Enviar</string>
   <!--startup dialogs-->
+  <string name="startup_battery_optimization">Optimización de batería</string>
+  <string name="startup_battery_optimization_message">Android puede desactivar/reducir la sincronización de DAVdroid después de unos días. Para prevenir esto, desactiva la optimización.</string>
+  <string name="startup_battery_optimization_disable">Apagar para DAVdroid</string>
   <string name="startup_dont_show_again">No mostrar de nuevo</string>
+  <string name="startup_development_version">Versión candidata final de DAVdroid</string>
   <string name="startup_development_version_message">Esta es una versión de desarrollo de DAVdroid. Tenga presente que puede que no todo funcione como espera. Por favor, denos una retroalimentación constructiva para mejorar DAVdroid.</string>
   <string name="startup_development_version_give_feedback">Dar retroalimentación</string>
   <string name="startup_donate">Información de código abierto</string>
@@ -18,9 +22,12 @@
   <string name="startup_google_play_accounts_removed_message">Bajo ciertas condiciones, el DRM de Play Store puede causar que todas las cuentas de DAVdroid se desconfiguren tras un reinicio o una actualización de DAVdroid. Si esto le afecta (y sólo en ese caso), por favor, instale \"DAVdroid JB Workaround\" desde Play Store.</string>
   <string name="startup_google_play_accounts_removed_more_info">Más información</string>
   <string name="startup_opentasks_not_installed">OpenTasks no está instalado</string>
-  <string name="startup_opentasks_not_installed_message">La aplicación OpenTasks no está instalada o accesible, por lo que DAVdroid no podrá sincronizar las listas de tareas. Reinstale DAVdroid y añada sus cuentas de nuevo después de instalar OpenTasks.</string>
+  <string name="startup_opentasks_not_installed_message">La aplicación OpenTasks no está disponible. DAVdroid no podrá sincronizar listas de tareas.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Tras instalar OpenTasks, tendrás que re-instalar DAVdroid y añadir tus cuentas de nuevo (por un error de Android).</string>
   <string name="startup_opentasks_not_installed_install">Instalar OpenTasks</string>
   <!--AboutActivity-->
+  <string name="about_license_terms">Términos de la licencia</string>
+  <string name="about_license_info_no_warranty">Este programa viene sin NINGÚN TIPO DE GARANTÍA. Es software libre, y cualquier contribución es bienvenida y redistribuida bajo ciertas condiciones.</string>
   <!--global settings-->
   <string name="logging_davdroid_file_logging">Archivo de registro de DAVdroid</string>
   <string name="logging_to_external_storage">Registrar en almacenamiento externo: %s</string>
@@ -28,34 +35,62 @@
   <string name="logging_couldnt_create_file">No se puede crear el archivo de registro externo: %s</string>
   <string name="logging_no_external_storage">Almacenamiento externo no encontrado</string>
   <!--AccountsActivity-->
+  <string name="navigation_drawer_open">Abrir panel de navegación</string>
+  <string name="navigation_drawer_close">Cerrar panel de navegación</string>
   <string name="navigation_drawer_subtitle">Adaptador de sincronización CalDAV/CardDAV</string>
   <string name="navigation_drawer_about">Acerca de / Licencia</string>
   <string name="navigation_drawer_settings">Ajustes</string>
+  <string name="navigation_drawer_news_updates">Noticias y actualizaciones</string>
   <string name="navigation_drawer_external_links">Enlaces externos</string>
   <string name="navigation_drawer_website">Sitio web</string>
   <string name="navigation_drawer_faq">Preguntas frequentes</string>
   <string name="navigation_drawer_forums">Comunidad</string>
   <string name="navigation_drawer_donate">Donar</string>
-  <string name="account_list_empty">Bienvenido a DAVdroid!\n\nAhora puede añadir una cuenta CalDAV/CardDAV.</string>
+  <string name="account_list_empty">Bienvenido a DAVdroid!\n\nAhora puedes añadir una cuenta CalDAV/CardDAV.</string>
   <!--DavService-->
+  <string name="dav_service_refresh_failed">Falló la detección del servicio</string>
+  <string name="dav_service_refresh_couldnt_refresh">No se pudo refrescar lista de colección</string>
   <!--AppSettingsActivity-->
   <string name="app_settings">Ajustes</string>
   <string name="app_settings_user_interface">Interfaz de usuario</string>
+  <string name="app_settings_reset_hints">Restablecer advertencias</string>
+  <string name="app_settings_reset_hints_summary">Habilita las advertencias que han sido rechazadas con anterioridad</string>
+  <string name="app_settings_reset_hints_success">Todas las advertencias se mostrarán nuevamente</string>
   <string name="app_settings_security">Seguridad</string>
-  <string name="app_settings_reset_trusted_certificates">Restablecer certificados de confianza</string>
-  <string name="app_settings_reset_trusted_certificates_summary">Olvidar todos los certificados aceptados previamente</string>
+  <string name="app_settings_distrust_system_certs">Invalidar los certificados del sistema</string>
+  <string name="app_settings_distrust_system_certs_on">Los CA del sistema y los añadidos por el usuario no serán válidos</string>
+  <string name="app_settings_distrust_system_certs_off">Los CA del sistema y los añadidos por el usuario serán usados y de confianza (recomendado)</string>
+  <string name="app_settings_reset_certificates">Reiniciar certificados (in)validados</string>
+  <string name="app_settings_reset_certificates_summary">Reinicia la validez de todos los certificados particulares</string>
+  <string name="app_settings_reset_certificates_success">Todos los certificados particulares han sido limpiados</string>
   <string name="app_settings_debug">Depuración</string>
+  <string name="app_settings_log_to_external_storage">Registrar en fichero externo</string>
+  <string name="app_settings_log_to_external_storage_on">Registro en almacenamiento externo (si está disponible)</string>
+  <string name="app_settings_log_to_external_storage_off">El archivo de registro externo está deshabilitado</string>
+  <string name="app_settings_show_debug_info">Mostrar la información de depuración</string>
+  <string name="app_settings_show_debug_info_details">Ver/compartir detalles de software y configuración</string>
   <!--AccountActivity-->
   <string name="account_synchronize_now">Sincronizar ahora</string>
   <string name="account_synchronizing_now">Sincronizando...</string>
   <string name="account_settings">Ajustes de cuenta</string>
   <string name="account_delete">Eliminar cuenta</string>
-  <string name="account_delete_confirmation_title">¿Seguro que desea eliminar la cuenta?</string>
-  <string name="account_delete_confirmation_text">Todas las copias locales de sus contactos, calendarios y tareas serán eliminadas.</string>
+  <string name="account_delete_confirmation_title">¿Seguro que deseas eliminar la cuenta?</string>
+  <string name="account_delete_confirmation_text">Todas las copias locales de tus contactos, calendarios y tareas serán eliminadas.</string>
   <string name="account_refresh_address_book_list">Refrescar contactos</string>
   <string name="account_create_new_address_book">Crear nueva lista de contactos</string>
   <string name="account_refresh_calendar_list">Refrescar calendario</string>
   <string name="account_create_new_calendar">Crear nuevo calendario</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">Permisos de DAVdroid</string>
+  <string name="permissions_calendar">Permisos de calendario</string>
+  <string name="permissions_calendar_details">Para sincronizar eventos CalDAV con tus calendarios locales, DAVdroid necesita acceder a los mismos.</string>
+  <string name="permissions_calendar_request">Solicitar permisos sobre calendario</string>
+  <string name="permissions_contacts">Permisos de contactos</string>
+  <string name="permissions_contacts_details">Para sincronizar libretas de contactos CadDAV con tus contactos locales, DAVdroid necesita acceder a los mismos.</string>
+  <string name="permissions_contacts_request">Solicitar permisos sobre contactos</string>
+  <string name="permissions_opentasks">Permisos de OpenTasks</string>
+  <string name="permissions_opentasks_details">Para sincronizar listas de tareas CalDAV con tus listas de tareas locales, DAVdroid necesita acceder a OpenTasks.</string>
+  <string name="permissions_opentasks_request">Solicitar permisos sobre OpenTasks</string>
   <!--AddAccountActivity-->
   <string name="login_title">Añadir cuenta</string>
   <string name="login_type_email">Acceder con cuenta de correo</string>
@@ -69,17 +104,17 @@
   <string name="login_user_name">Nombre de usuario</string>
   <string name="login_user_name_required">Nombre de usuario requerido</string>
   <string name="login_base_url">URL base</string>
-  <string name="login_auth_preemptive">Autenticación preferente (recomendado, pero incompatible con Digest auth)</string>
   <string name="login_login">Registrar</string>
   <string name="login_back">Volver</string>
   <string name="login_create_account">Crear cuenta</string>
   <string name="login_account_name">Nombre de cuenta</string>
-  <string name="login_account_name_info">Use su dirección de correo como nombre de su cuenta puesto que Android usará el nombre de la cuenta como campo de \"organizador\" en los eventos que cree. No puede tener dos cuentas con el mismo nombre.</string>
+  <string name="login_account_name_info">Usa tu dirección de correo como nombre de cuenta puesto que Android usará el nombre de la cuenta como campo de \"organizador\" en los eventos que cree. No puedes tener dos cuentas con el mismo nombre.</string>
+  <string name="login_account_contact_group_method">Método de contacto de grupo:</string>
   <string name="login_account_name_required">Nombre de cuenta requerido</string>
   <string name="login_account_not_created">La cuenta no pudo ser creada</string>
   <string name="login_configuration_detection">Detectar configuración</string>
-  <string name="login_querying_server">Por favor espere, consultando al servidor...</string>
-  <string name="login_no_caldav_carddav">No se pudo encontrar servicio CalDAV o CardDAV.</string>
+  <string name="login_querying_server">Por favor espera, consultando al servidor...</string>
+  <string name="login_no_caldav_carddav">No se pudo encontrar el servicio CalDAV o CardDAV.</string>
   <string name="login_view_logs">Ver registros</string>
   <!--AccountSettingsActivity-->
   <string name="settings_title">Ajustes: %s</string>
@@ -89,9 +124,6 @@
   <string name="settings_password">Contraseña</string>
   <string name="settings_password_summary">Actualiza la contraseña de acuerdo a tu servidor.</string>
   <string name="settings_enter_password">Introduce tu contraseña:</string>
-  <string name="settings_preemptive">Autenticación preferente</string>
-  <string name="settings_preemptive_on">Las credenciales se envían en cada petición (recomendado)</string>
-  <string name="settings_preemptive_off">Las credenciales se envían después de que el servidor las pida</string>
   <string name="settings_sync">Sincronización</string>
   <string name="settings_sync_interval_contacts">Intervalo de sincronización de contactos</string>
   <string name="settings_sync_summary_manually">Solo manualmente</string>
@@ -119,13 +151,34 @@
     <item>Cada 4 horas</item>
     <item>Una vez al día</item>
   </string-array>
+  <string name="settings_sync_wifi_only">Sincronizar sólo sobre WiFi</string>
+  <string name="settings_sync_wifi_only_on">La sincronización está restringida a conexiones WiFi</string>
+  <string name="settings_sync_wifi_only_off">Tipo de conexión no tenido en cuenta</string>
+  <string name="settings_sync_wifi_only_ssid">Restricción WiFi SSID</string>
+  <string name="settings_sync_wifi_only_ssid_on">Sólo se sincronizará sobre %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Todas las conexiones WiFi pueden ser usadas</string>
+  <string name="settings_sync_wifi_only_ssid_message">Introduce el nombre de una red WiFi (SSID) para restringir la sincronización a esta red, o deja el campo en blanco para usar todas las conexiones WiFi.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">Método de contacto de grupo</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIAS</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>Los groups tienen VCards separadas</item>
+    <item>Los groups tienen una categoría por contacto</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
   <string name="settings_sync_time_range_past">Límite de tiempo de eventos pasados</string>
   <string name="settings_sync_time_range_past_none">Todos los eventos serán sincronizados</string>
   <plurals name="settings_sync_time_range_past_days">
     <item quantity="one">Los eventos anteriores a un día serán ignorados</item>
     <item quantity="other">Los eventos anteriores a %d días serán ignorados</item>
   </plurals>
-  <string name="settings_sync_time_range_past_message">Los eventos anteriores a este número de días serán ignorados (puede ser 0). Deje en blanco el campo para sincronizar todos los eventos.</string>
+  <string name="settings_sync_time_range_past_message">Los eventos anteriores a este número de días serán ignorados (puede ser 0). Deja en blanco el campo para sincronizar todos los eventos.</string>
+  <string name="settings_manage_calendar_colors">Colores de calendario</string>
+  <string name="settings_manage_calendar_colors_on">Los colores de los calendarios son administrados por DAVdroid</string>
+  <string name="settings_manage_calendar_colors_off">Los colores de los calendarios no son establecidos por DAVdroid</string>
   <string name="settings_version_update">Actualización de la versión de Android</string>
   <string name="settings_version_update_settings_updated">Los ajustes internos han sido actualizados.</string>
   <string name="settings_version_update_install_hint">¿Problemas? Desinstala y vuelve a instalar DAVdroid.</string>
@@ -144,9 +197,10 @@
   <string name="create_collection_display_name">Nombre mostrado (título):</string>
   <string name="create_collection_display_name_required">Título requerido</string>
   <string name="create_collection_description">Descripción (opcional):</string>
+  <string name="create_collection_home_set">Establecer localización:</string>
   <string name="create_collection_create">Crear</string>
   <string name="delete_collection">Eliminar colección</string>
-  <string name="delete_collection_confirm_title">¿Está seguro/a?</string>
+  <string name="delete_collection_confirm_title">¿Estás seguro/a?</string>
   <string name="delete_collection_confirm_warning">Esta colección (%s) y toda su información será eliminada del servidor.</string>
   <string name="delete_collection_deleting_collection">Eliminando colección</string>
   <!--ExceptionInfoFragment-->
@@ -156,6 +210,8 @@
   <string name="exception_show_details">Mostrar detalles</string>
   <!--sync errors and DebugInfoActivity-->
   <string name="debug_info_title">Información de depuración</string>
+  <string name="sync_error_permissions">Permisos de DAVdroid</string>
+  <string name="sync_error_permissions_text">Permisos adicionales requeridos</string>
   <string name="sync_error_calendar">La sincronización de calendario falló (%s)</string>
   <string name="sync_error_contacts">La sincronización de agenda falló (%s)</string>
   <string name="sync_error_tasks">La sincronización de tareas falló (%s)</string>
@@ -163,17 +219,21 @@
   <string name="sync_error_http_dav">Error de servidor al %s</string>
   <string name="sync_error_local_storage">Error de base de datos al %s</string>
   <string-array name="sync_error_phases">
-    <item>preparar sincronización</item>
-    <item>consultar capacidades</item>
-    <item>procesar entradas borradas localmente</item>
-    <item>preparar entradas creadas/modificadas</item>
-    <item>cargar entradas creadas/modificadas</item>
-    <item>comprobar estado de sincronización</item>
-    <item>listar entradas locales</item>
-    <item>listar entradas remotas</item>
-    <item>comparar entradas locaesl/remotas</item>
-    <item>descargar entradas remotas</item>
-    <item>guardar estado de sincronización</item>
+    <item>preparando sincronización</item>
+    <item>buscando capacidades</item>
+    <item>procesando entradas borradas localmente</item>
+    <item>preparando entradas creadas/modificadas</item>
+    <item>cargando entradas creadas/modificadas</item>
+    <item>comprobando estado de sincronización</item>
+    <item>enumerando entradas locales</item>
+    <item>enumerando entradas remotas</item>
+    <item>comparando entradas locales/remotas</item>
+    <item>descargando entradas remotas</item>
+    <item>post-procesando</item>
+    <item>guardando estado de sincronización</item>
   </string-array>
   <string name="sync_error_unauthorized">Nombre de usuario/contraseña erróneo</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: Seguridad de conexión</string>
+  <string name="trust_certificate_unknown_certificate_found">DAVdroid ha encontrado un certificado desconocido. ¿Quieres que sea válido?</string>
 </resources>

app/src/davdroid/res/values-fr/strings.xml

@@ -0,0 +1,227 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!--common strings-->
+  <string name="app_name">DAVdroid</string>
+  <string name="help">Aide</string>
+  <string name="manage_accounts">Gestion des comptes</string>
+  <string name="please_wait">SVP attendez ...</string>
+  <string name="send">Envoyer</string>
+  <!--startup dialogs-->
+  <string name="startup_battery_optimization">Optimisation de la batterie</string>
+  <string name="startup_battery_optimization_message">Android peut désactiver/réduire la synchronisation de DAVdroid après quelques jours. Pour éviter cela, désactivez l\'optimisation de la batterie.</string>
+  <string name="startup_battery_optimization_disable">Désactivez pour DAVdroid</string>
+  <string name="startup_dont_show_again">Ne plus afficher</string>
+  <string name="startup_development_version">Pré-version de DAVdroid</string>
+  <string name="startup_development_version_message">Il s\'agit d\'une version de développement de DAVdroid. Il se peut que les choses ne fonctionnent pas comme prévu. S’il vous plaît faites-nous un retour pour améliorer DAVdroid.</string>
+  <string name="startup_development_version_give_feedback">Faire un commentaire</string>
+  <string name="startup_donate">Open-Source Information</string>
+  <string name="startup_donate_message">Nous sommes heureux que vous utilisez DAVdroid, qui est un logiciel open-source (GPLv3). Parce que développer DAVdroid est un travail difficile et nous a pris de nombreuses heures, s\'il vous plaît envisager de faire un don.</string>
+  <string name="startup_donate_now">Faire un don</string>
+  <string name="startup_donate_later">Plus tard</string>
+  <string name="startup_google_play_accounts_removed">Erreur information Play Store DRM</string>
+  <string name="startup_google_play_accounts_removed_message">Dans certaines conditions, Play Store DRM peut provoquer la disparition de tous les comptes DAVdroid après un redémarrage ou après la mise à niveau de DAVdroid. Si vous êtes concerné par ce problème (et seulement alors), s\'il vous plaît installer \"DAVdroid JB Solution\" du Play Store.</string>
+  <string name="startup_google_play_accounts_removed_more_info">Plus d\'information</string>
+  <string name="startup_opentasks_not_installed">OpenTasks n\'est pas installé</string>
+  <string name="startup_opentasks_not_installed_message">L\'application OpenTasks n\'est pas disponible, donc DAVdroid ne pourra pas synchroniser des listes de tâches.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Après l\'installation OpenTasks, vous devez RE-INSTALLER DAVdroid et ajoutez vos comptes à nouveau (bug Android).</string>
+  <string name="startup_opentasks_not_installed_install">Installer OpenTasks</string>
+  <!--AboutActivity-->
+  <string name="about_license_terms">Conditions d\'utilisation</string>
+  <string name="about_license_info_no_warranty">Ce programme est fourni sans AUCUNE GARANTIE. C\'est un logiciel libre, et vous êtes en droit de le redistribuer sous certaines conditions.</string>
+  <!--global settings-->
+  <string name="logging_davdroid_file_logging">DAVdroid fichier de journalisation</string>
+  <string name="logging_to_external_storage">Se connecter au stockage externe: %s</string>
+  <string name="logging_to_external_storage_warning">Supprimer les journaux dès que possible!</string>
+  <string name="logging_couldnt_create_file">Impossible de créer le fichier journal externe: %s</string>
+  <string name="logging_no_external_storage">Stockage externe introuvable</string>
+  <!--AccountsActivity-->
+  <string name="navigation_drawer_open">Ouvrir le tiroir de navigation</string>
+  <string name="navigation_drawer_close">Fermer le tiroir de navigation</string>
+  <string name="navigation_drawer_about">A propos / Licence</string>
+  <string name="navigation_drawer_settings">Paramètres</string>
+  <string name="navigation_drawer_news_updates">Actualité &amp; mise à jour</string>
+  <string name="navigation_drawer_external_links">Liens externes</string>
+  <string name="navigation_drawer_website">Site Web</string>
+  <string name="navigation_drawer_faq">FAQ</string>
+  <string name="navigation_drawer_forums">Communauté</string>
+  <string name="navigation_drawer_donate">Faire un don</string>
+  <string name="account_list_empty">Bienvenue sur DAVdroid!\n\nVous pouvez maintenant ajouter un compte CalDAV/CardDAV.</string>
+  <!--DavService-->
+  <string name="dav_service_refresh_failed">La détection du service a échoué</string>
+  <string name="dav_service_refresh_couldnt_refresh">Impossible d\'actualiser la liste de collection</string>
+  <!--AppSettingsActivity-->
+  <string name="app_settings">Paramètres</string>
+  <string name="app_settings_user_interface">Interface utilisateur</string>
+  <string name="app_settings_reset_hints">Réinitialiser les astuces</string>
+  <string name="app_settings_reset_hints_summary">Réactiver les astuces qui ont été vu précédemment</string>
+  <string name="app_settings_reset_hints_success">Toutes les astuces seront affichés à nouveau</string>
+  <string name="app_settings_security">Sécurité</string>
+  <string name="app_settings_reset_certificates_summary">Réinitialiser la confiance de tous les certificats personnalisés</string>
+  <string name="app_settings_reset_certificates_success">Tous les certificats personnalisés ont été effacés</string>
+  <string name="app_settings_debug">Débogage</string>
+  <string name="app_settings_log_to_external_storage">Journaliser dans un fichier externe</string>
+  <string name="app_settings_log_to_external_storage_on">Journaliser sur le stockage externe (si disponible)</string>
+  <string name="app_settings_log_to_external_storage_off">Le fichier externe n\'est pas disponible.</string>
+  <string name="app_settings_show_debug_info">Afficher les infos de débogage</string>
+  <string name="app_settings_show_debug_info_details">Voir/partager l\'application et les détails de configuration</string>
+  <!--AccountActivity-->
+  <string name="account_synchronize_now">Synchroniser maintenant</string>
+  <string name="account_synchronizing_now">Synchronisation en cours</string>
+  <string name="account_settings">Paramètres du compte</string>
+  <string name="account_delete">Supprimer le compte</string>
+  <string name="account_delete_confirmation_title">Voulez-vous vraiment supprimer le compte?</string>
+  <string name="account_delete_confirmation_text">Toutes les copies locales des carnets d\'adresses, des calendriers et des listes de tâches seront supprimées.</string>
+  <string name="account_refresh_address_book_list">Actualiser le carnet d\'adresse</string>
+  <string name="account_create_new_address_book">Créer un nouveau carnet d\'adresse</string>
+  <string name="account_refresh_calendar_list">Actualiser le calendrier</string>
+  <string name="account_create_new_calendar">Créer un nouveau calendrier</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">Autorisations DAVdroid</string>
+  <string name="permissions_calendar">Autorisations calendrier</string>
+  <string name="permissions_calendar_details">Pour synchroniser les événements CalDAV avec vos calendriers locaux, DAVdroid a besoin d\'accéder à vos calendriers.</string>
+  <string name="permissions_calendar_request">Demande d\'autorisations d\'accéder au calendrier</string>
+  <string name="permissions_contacts">Autorisations contacts</string>
+  <string name="permissions_contacts_details">Pour synchroniser les carnets d\'adresses de CardDAV avec votre carnet d\'adresses local, DAVdroid a besoin d\'accéder à vos contacts.</string>
+  <string name="permissions_contacts_request">Demande d\'autorisations d\'accéder aux contacts</string>
+  <string name="permissions_opentasks">Autorisations OpenTasks</string>
+  <string name="permissions_opentasks_details">Pour synchroniser les tâches de CalDAV avec vos listes de tâches locales, DAVdroid a besoin d\'accéder à OpenTasks.</string>
+  <string name="permissions_opentasks_request">Demande d\'autorisations d\'accéder à OpenTasks</string>
+  <!--AddAccountActivity-->
+  <string name="login_title">Ajouter un compte</string>
+  <string name="login_type_email">Connexion avec une adresse email</string>
+  <string name="login_email_address">Adresse mail</string>
+  <string name="login_email_address_error">Une adresse e-mail valide est requis</string>
+  <string name="login_password">Mot de passe</string>
+  <string name="login_password_required">Mot de passe requis</string>
+  <string name="login_type_url">Connexion avec une URL et un nom d\'utilisateur</string>
+  <string name="login_url_must_be_http_or_https">L\'URL doit commencer par http(s)://</string>
+  <string name="login_url_host_name_required">Nom d\'hôte requis</string>
+  <string name="login_user_name">Nom d\'utilisateur</string>
+  <string name="login_user_name_required">Nom d\'utilisateur requis</string>
+  <string name="login_base_url">URL de base</string>
+  <string name="login_login">Se connecter</string>
+  <string name="login_back">Retour</string>
+  <string name="login_create_account">Créer un compte</string>
+  <string name="login_account_name">Nom du compte</string>
+  <string name="login_account_name_info">Utilisez votre adresse e-mail comme nom de compte car Android utilisera ce nom en tant que champ ORGANISATEUR pour les événements que vous créerez. Vous ne pouvez pas avoir deux comptes avec le même nom.</string>
+  <string name="login_account_name_required">Nom du compte requis</string>
+  <string name="login_account_not_created">Le compte n\'a pas pu être créé</string>
+  <string name="login_configuration_detection">Détection de la configuration</string>
+  <string name="login_querying_server">S\'il vous plaît patienter, nous interrogeons le serveur ...</string>
+  <string name="login_no_caldav_carddav">Aucun service CalDAV ou CardDAV trouvé.</string>
+  <string name="login_view_logs">Voir infos de débogage</string>
+  <!--AccountSettingsActivity-->
+  <string name="settings_title">Paramètres: %s</string>
+  <string name="settings_authentication">Authentification</string>
+  <string name="settings_username">Nom d\'utilisateur</string>
+  <string name="settings_enter_username">Saisissez votre nom d\'utilisateur :</string>
+  <string name="settings_password">Mot de passe</string>
+  <string name="settings_password_summary">Mettre à jour le mot de passe </string>
+  <string name="settings_enter_password">Saisissez votre mot de passe :</string>
+  <string name="settings_sync">Synchronisation</string>
+  <string name="settings_sync_interval_contacts">Interval de synchronisation des carnets d\'adresses</string>
+  <string name="settings_sync_summary_manually">Manuellement</string>
+  <string name="settings_sync_summary_periodically" tools:ignore="PluralsCandidate">Toutes les %d minutes et immédiatement après un changement local</string>
+  <string name="settings_sync_summary_not_available">Indisponible</string>
+  <string name="settings_sync_interval_calendars">Interval de synchronisation des agendas</string>
+  <string name="settings_sync_interval_tasks">Interval de synchronisation des tâches</string>
+  <string-array name="settings_sync_interval_seconds">
+    <item>-1</item>
+    <item>300</item>
+    <item>600</item>
+    <item>900</item>
+    <item>3600</item>
+    <item>7200</item>
+    <item>14400</item>
+    <item>86400</item>
+  </string-array>
+  <string-array name="settings_sync_interval_names">
+    <item>Manuellement</item>
+    <item>Toutes les 5 minutes</item>
+    <item>Toutes les 10 minutes</item>
+    <item>Toutes les 15 minutes</item>
+    <item>Toutes les heures</item>
+    <item>Toutes les 2 heures</item>
+    <item>Toutes les 4 heures</item>
+    <item>Une fois par jour</item>
+  </string-array>
+  <string name="settings_sync_wifi_only">Synchronisation en Wifi seulement</string>
+  <string name="settings_sync_wifi_only_on">La synchronisation est limitée aux connexions WiFi</string>
+  <string name="settings_sync_wifi_only_off">Le type de connexion n\'est pas pris en charge</string>
+  <string name="settings_sync_wifi_only_ssid">Restriction WiFi SSID</string>
+  <string name="settings_sync_wifi_only_ssid_on">Sera seulement synchroniser avec %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Toutes les connexions WiFi peuvent être utilisées</string>
+  <string name="settings_sync_wifi_only_ssid_message">Entrez le nom d\'un réseau WiFi (SSID) pour restreindre la synchronisation à ce réseau, ou laisser vide pour autoriser toutes les connexions WiFi.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
+  <string name="settings_sync_time_range_past">Limite des événements passés</string>
+  <string name="settings_sync_time_range_past_none">Tous les événements seront synchronisés</string>
+  <plurals name="settings_sync_time_range_past_days">
+    <item quantity="one">Les événements de plus d’un jour passé seront ignorés</item>
+    <item quantity="other">Les événements de plus de %d jours passés seront ignorés</item>
+  </plurals>
+  <string name="settings_sync_time_range_past_message">Les événements antérieurs à ce nombre de jours seront ignorés (peut être 0). Laissez vide pour synchroniser tous les événements.</string>
+  <string name="settings_manage_calendar_colors">Choisir couleur du calendrier</string>
+  <string name="settings_manage_calendar_colors_on">Les couleurs de calendrier sont gérées par DAVdroid</string>
+  <string name="settings_manage_calendar_colors_off">Les couleurs de calendrier ne sont pas gérées par DAVdroid</string>
+  <string name="settings_version_update">Mise à jour de la version de DAVdroid</string>
+  <string name="settings_version_update_settings_updated">Les paramètres internes ont été mis à jour.</string>
+  <string name="settings_version_update_install_hint">Un problème? Désinstaller DAVdroid, puis réinstaller.</string>
+  <!--collection management-->
+  <string name="create_addressbook">Créer un carnet d\'adresses</string>
+  <string name="create_addressbook_display_name_hint">Mon carnet d\'adresses</string>
+  <string name="create_calendar">Créer une collection CalDAV</string>
+  <string name="create_calendar_display_name_hint">Mon calendrier</string>
+  <string name="create_calendar_time_zone">Fuseau horaire:</string>
+  <string name="create_calendar_type">Type de collection:</string>
+  <string name="create_calendar_type_only_events">Calendrier (événements seulement)</string>
+  <string name="create_calendar_type_only_tasks">Liste de tâches (tâches seulement)</string>
+  <string name="create_calendar_type_events_and_tasks">Fusionner (événements et tâches)</string>
+  <string name="create_collection_color">Choisir une couleur pour la collection</string>
+  <string name="create_collection_creating">Création collection</string>
+  <string name="create_collection_display_name">Le nom affiché (titre) pour cette collection:</string>
+  <string name="create_collection_display_name_required">Titre requis</string>
+  <string name="create_collection_description">Description (facultatif)</string>
+  <string name="create_collection_home_set">Accueil:</string>
+  <string name="create_collection_create">Créer</string>
+  <string name="delete_collection">Supprimer la collection</string>
+  <string name="delete_collection_confirm_title">Êtes-vous sur?</string>
+  <string name="delete_collection_confirm_warning">Cette collection (%s) et toutes ses données seront supprimées du serveur.</string>
+  <string name="delete_collection_deleting_collection">Suppression de la collection</string>
+  <!--ExceptionInfoFragment-->
+  <string name="exception">Une erreur est survenue.</string>
+  <string name="exception_httpexception">Une erreur HTTP est survenue.</string>
+  <string name="exception_ioexception">Une erreur I/O est survenue.</string>
+  <string name="exception_show_details">Voir détails</string>
+  <!--sync errors and DebugInfoActivity-->
+  <string name="debug_info_title">Infos de débogage</string>
+  <string name="sync_error_permissions">Autorisations DAVdroid</string>
+  <string name="sync_error_permissions_text">Autorisations supplémentaires demandées</string>
+  <string name="sync_error_calendar">Échec de la synchronisation du calendrier (%s)</string>
+  <string name="sync_error_contacts">Échec de la synchronisation du carnet d\'adresse (%s)</string>
+  <string name="sync_error_tasks">Échec de la synchronisation (%s)</string>
+  <string name="sync_error">Erreur durant %s</string>
+  <string name="sync_error_http_dav">Erreur de serveur durant %s</string>
+  <string name="sync_error_local_storage">Erreur de base de donnée durant %s</string>
+  <string-array name="sync_error_phases">
+    <item>prépare la synchronisation</item>
+    <item>demande les autorisations</item>
+    <item>procède à la suppression des entrées locales</item>
+    <item>prépare les entrées créées/modifiées</item>
+    <item>envoi les entrées créées/modifiées</item>
+    <item>vérifie l\'état de la synchronisation</item>
+    <item>liste les entrées locales</item>
+    <item>liste les entrées distantes</item>
+    <item>compare les entrées locales/distantes</item>
+    <item>télécharge les entrées distantes</item>
+    <item>post-traitement</item>
+    <item>enregistre l\'état de la synchronisation</item>
+  </string-array>
+  <string name="sync_error_unauthorized">Nom d\'utilisateur ou mot de passe erroné</string>
+  <!--cert4android-->
+  <string name="trust_certificate_unknown_certificate_found">DAVdroid a rencontré un certificat inconnu. Voulez-vous lui faire confiance?</string>
+</resources>

app/src/davdroid/res/values-hu/strings.xml

@@ -7,6 +7,9 @@
   <string name="please_wait">Kérjük, várjon ...</string>
   <string name="send">Küldés</string>
   <!--startup dialogs-->
+  <string name="startup_battery_optimization">Akkumulátoroptimalizálás </string>
+  <string name="startup_battery_optimization_message">Az operációs rendszer a DAVdroid szinkronizálást pár nap után leállíthatja vagy visszafoghatja.  Ennek elkerülésére kapcsolja ki az akkumulátoroptimalizálást.</string>
+  <string name="startup_battery_optimization_disable">Kikapcsolás a DAVdroid kapcsán</string>
   <string name="startup_dont_show_again">Ne jelenjen meg többet</string>
   <string name="startup_development_version">DAVdroid előzetes kiadás</string>
   <string name="startup_development_version_message">Ez a DAVdroid egy fejlesztői verziója.  Elképzelhető, hogy nem minden működik úgy, ahogyan kellene.  Ha így lenne, kérjük küldjön a tapasztaltakról visszajelzést.</string>
@@ -19,7 +22,8 @@
   <string name="startup_google_play_accounts_removed_message">Bizonyos körülmények között  a Play Áruház DRM okozhatja azt, hogy az eszköz újraindítását vagy a DAVdroid frissítését követően a DAVdroid fiókok eltűnnek.  Amennyiben (és csak amennyiben) érinti Önt ez a probléma, telepítse a \"DAVdroid JB Workaround\" alkalmazást Play Áruházból.</string>
   <string name="startup_google_play_accounts_removed_more_info">További információk</string>
   <string name="startup_opentasks_not_installed">Az OpenTasks nincs telepítve</string>
-  <string name="startup_opentasks_not_installed_message">Az OpenTasks alkalmazás nincs telepítve vagy nem elérhető, ezért a DAVdroid nem lesz képes a feladatlisták szinkronizálására.  Az OpenTasks telepítése után telepítse újra a DAVdroid-ot majd hozza létre a fiókot újra.</string>
+  <string name="startup_opentasks_not_installed_message">Az OpenTasks alkalmazás nincs telepítve, így a DAVdroid nem lesz képes szinkronizálni feladatlistákat.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Az OpenTasks telepítését követően újra kell telepíteni a DAVdroit alkalmazást és újra fel kell venni a fiókokat (Android hiba).</string>
   <string name="startup_opentasks_not_installed_install">Az OpenTasks telepítése</string>
   <!--AboutActivity-->
   <string name="about_license_terms">Licencfeltételek</string>
@@ -52,13 +56,19 @@
   <string name="app_settings_reset_hints">Tippek visszaállítása</string>
   <string name="app_settings_reset_hints_summary">Újra jelenjen meg az összes tipp</string>
   <string name="app_settings_reset_hints_success">Az összes tipp újra meg fog jelenni</string>
+  <string name="app_settings_connection">Kapcsolat</string>
+  <string name="app_settings_override_proxy">Proxybeállítások felülírása</string>
+  <string name="app_settings_override_proxy_on">Egyedi proxybeállítások</string>
+  <string name="app_settings_override_proxy_off">Az alapértelmezett proxybeállítás használata</string>
+  <string name="app_settings_override_proxy_host">HTTP proxyállomás neve</string>
+  <string name="app_settings_override_proxy_port">HTTP proxy port</string>
   <string name="app_settings_security">Biztonság</string>
-  <string name="app_settings_reset_trusted_certificates">A tanúsítványtár visszaállítása</string>
-  <string name="app_settings_reset_trusted_certificates_summary">Az összes korábban megbízhatónak kiválasztott tanúsítvány törlése</string>
-  <plurals name="app_settings_reset_trusted_certificates_success">
-    <item quantity="one">Egy tanúsítvány megbízhatósága törölve</item>
-    <item quantity="other">%d tanúsítvány megbízhatósága törölve</item>
-  </plurals>
+  <string name="app_settings_distrust_system_certs">A rendszertanúsítványok elfogadása</string>
+  <string name="app_settings_distrust_system_certs_on">A rendszer által kezelt, előre vagy felhasználó által telepített tanúsítványok figyelmen kívül lesznek hagyva</string>
+  <string name="app_settings_distrust_system_certs_off">A rendszer által kezelt, előre vagy felhasználó által telepített tanúsítványok megbízhatóak (javasolt)</string>
+  <string name="app_settings_reset_certificates">A tanúsítványok megbízhatóságának törlésére</string>
+  <string name="app_settings_reset_certificates_summary">A tanúsítványok megbízhatóságával kapcsolatos beállítások törlésére</string>
+  <string name="app_settings_reset_certificates_success">A tanúsítványok megbízhatóságával kapcsolatos beállítások törölve</string>
   <string name="app_settings_debug">Hibakeresés</string>
   <string name="app_settings_log_to_external_storage">Naplózás fájlba</string>
   <string name="app_settings_log_to_external_storage_on">Naplózás külső tárhelyre (ha elérhető)</string>
@@ -76,6 +86,17 @@
   <string name="account_create_new_address_book">Új címjegyzék létrehozása</string>
   <string name="account_refresh_calendar_list">Naptárlista frissítése</string>
   <string name="account_create_new_calendar">Új naptár létrehozása</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">DAVdroid engedélyek </string>
+  <string name="permissions_calendar">Naptárengedély</string>
+  <string name="permissions_calendar_details">A CalDAV naptárak és a helyi naptárak szinkronizálásához a DAVdroid naptárhozzáférést igényel.</string>
+  <string name="permissions_calendar_request">Naptárhozzáférés igénylése</string>
+  <string name="permissions_contacts">Névjegyengedélyek</string>
+  <string name="permissions_contacts_details">A CardDAV címlisták és a helyi címlisták szinkronizálásához a névjegyhozzáférést igényel.</string>
+  <string name="permissions_contacts_request">Névjegyengedélyek igénylése</string>
+  <string name="permissions_opentasks">OpenTasks engedélyek</string>
+  <string name="permissions_opentasks_details">A CalDAV feladatlisták és a helyi feladatlisták szinkronizálásához a DAVdroid OpenTasks hozzáférést igényel.</string>
+  <string name="permissions_opentasks_request">OpenTasks engedélyek igénylése</string>
   <!--AddAccountActivity-->
   <string name="login_title">Fiók hozzáadása</string>
   <string name="login_type_email">Bejelentkezés email cím segítségével</string>
@@ -89,12 +110,12 @@
   <string name="login_user_name">Felhasználónév</string>
   <string name="login_user_name_required">A felhasználónév megadása feltétlenül szükséges</string>
   <string name="login_base_url">URL-törzs</string>
-  <string name="login_auth_preemptive">Preemptív authentikáció (ajánlott, de Digest authentikációval nem működik)</string>
   <string name="login_login">Bejelentkezés</string>
   <string name="login_back">Vissza</string>
   <string name="login_create_account">Fiók létrehozása</string>
   <string name="login_account_name">A fiók neve</string>
   <string name="login_account_name_info">Használja az email címet fióknévként, mert később a létrehozandó események szervezőjeként (ORGANIZER mező) az Android ezt fogja használni. Két fiókot nem lehet azonos néven létrehozni.</string>
+  <string name="login_account_contact_group_method">A csoportok kezelésének módja:</string>
   <string name="login_account_name_required">A fióknév megadása feltétlenül szükséges</string>
   <string name="login_account_not_created">A fiók létrehozása nem sikerült</string>
   <string name="login_configuration_detection">A konfiguráció felderítése</string>
@@ -109,9 +130,6 @@
   <string name="settings_password">Jelszó</string>
   <string name="settings_password_summary">Adja meg a szerveren érvényes új jelszót.</string>
   <string name="settings_enter_password">Adja meg a jelszót:</string>
-  <string name="settings_preemptive">Preemptív authentikáció</string>
-  <string name="settings_preemptive_on">A hitelesítő adatok elküldése minden kérésnél (ajánlott)</string>
-  <string name="settings_preemptive_off">A hitelesítő adatok elküldése, csak ha a szerver azt igényli</string>
   <string name="settings_sync">Szinkronizálás</string>
   <string name="settings_sync_interval_contacts">Névjegyszinkronizálás sűrűsége</string>
   <string name="settings_sync_summary_manually">Manuális</string>
@@ -139,6 +157,24 @@
     <item>4 óránként</item>
     <item>Naponta</item>
   </string-array>
+  <string name="settings_sync_wifi_only">Szinkronizálás csak WIFI-n</string>
+  <string name="settings_sync_wifi_only_on">Csak WIFI kapcsolat keresztül történjen szinkronizálás</string>
+  <string name="settings_sync_wifi_only_off">Szinkronizálás a kapcsolat típusától függetlenül</string>
+  <string name="settings_sync_wifi_only_ssid">WIFI SSID szűkítés</string>
+  <string name="settings_sync_wifi_only_ssid_on">Szinkronizálás csak a(z) %s hálózatra kapcsolódva</string>
+  <string name="settings_sync_wifi_only_ssid_off">Szinkronizálás bármely WIFI hálózaton</string>
+  <string name="settings_sync_wifi_only_ssid_message">Adja meg a WIFI hálózat nevét (SSID) a szinkronizálás egy hálózatra való korlátozához, vagy hagyja üresen, ha nem akar ilyen szűkítést.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">A csoportok kezelésének módja</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>Minden csoport egy különálló VCard</item>
+    <item>A csoportok a kapcsolatonkéni kategóriák</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
   <string name="settings_sync_time_range_past">Múltbéli események időkorlátja</string>
   <string name="settings_sync_time_range_past_none">Minden esemény szinkronizálása</string>
   <plurals name="settings_sync_time_range_past_days">
@@ -146,6 +182,9 @@
     <item quantity="other">A %d napnál régebbi események figyelmen kívül hagyása</item>
   </plurals>
   <string name="settings_sync_time_range_past_message">Az ennyi napnál (lehet 0) régebbi események figyelmen kívül lesznek hagyva.  Hagyja üresen, ha minden múltbéli eseményt szinkronizálni akar.</string>
+  <string name="settings_manage_calendar_colors">Naptárszínek kezelése</string>
+  <string name="settings_manage_calendar_colors_on">A naptárszíneket a DAVdroid kezeli</string>
+  <string name="settings_manage_calendar_colors_off">A naptárszíneket nem a DAVdroid kezeli</string>
   <string name="settings_version_update">DAVdroid frissítése</string>
   <string name="settings_version_update_settings_updated">A belső beállítások frissítve lettek.</string>
   <string name="settings_version_update_install_hint">Probléma?  Próbálja meg törölni majd újratelepíteni a DAVdroid-ot.</string>
@@ -177,6 +216,8 @@
   <string name="exception_show_details">Részletek megjelenítése</string>
   <!--sync errors and DebugInfoActivity-->
   <string name="debug_info_title">Hibakeresési információ</string>
+  <string name="sync_error_permissions">DAVdroid engedélyek </string>
+  <string name="sync_error_permissions_text">További engedélyek szükségesek</string>
   <string name="sync_error_calendar">A naptár szinkronizálása nem sikerült (%s)</string>
   <string name="sync_error_contacts">A címjegyzék szinkronizálása nem sikerült (%s)</string>
   <string name="sync_error_tasks">A feladatok szinkronizálása nem sikerült (%s)</string>
@@ -184,17 +225,21 @@
   <string name="sync_error_http_dav">Szerver oldali hiba az alábbi művelet közben: %s</string>
   <string name="sync_error_local_storage">Adatbázishiba az alábbi művelet közben: %s</string>
   <string-array name="sync_error_phases">
-    <item>felkészülés a szinkronizálásra</item>
-    <item>szolgáltatások keresése</item>
+    <item>szinkronizáció előkészítése </item>
+    <item>szerver képességeinek lekérdezése</item>
     <item>a helyben törölt bejegyzések feldolgozása</item>
-    <item>az új vagy módosított bejegyzések összegyűjtése</item>
+    <item>az új vagy módosított bejegyzések gyűjtése </item>
     <item>az új vagy módosított bejegyzések feltöltése</item>
-    <item>a szinkronizációs állapot ellenőrzése</item>
+    <item>szinkronizációs állapot ellenőrzése</item>
     <item>helyi bejegyzések listázása</item>
     <item>távoli bejegyzések listázása</item>
     <item>helyi és távoli bejegyzések összehasonlítása</item>
     <item>távoli bejegyzések letöltése</item>
+    <item>utófeldolgozás</item>
     <item>szinkronizációs állapot mentése</item>
   </string-array>
   <string name="sync_error_unauthorized">A felhasználónév vagy jelszó hibás</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: kapcsolatbiztonság</string>
+  <string name="trust_certificate_unknown_certificate_found">Egy eddig ismeretlen tanúsítvány érkezett.  Megbízhatónak kívánja elfogadni?</string>
 </resources>

app/src/davdroid/res/values-it/strings.xml

@@ -0,0 +1,232 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!--common strings-->
+  <string name="app_name">DAVdroid</string>
+  <string name="help">Aiuto</string>
+  <string name="manage_accounts">Gestione account</string>
+  <string name="please_wait">Attendere prego …</string>
+  <string name="send">Invia</string>
+  <!--startup dialogs-->
+  <string name="startup_battery_optimization">Ottimizazione della batteria</string>
+  <string name="startup_battery_optimization_message">Android può ridurre o disabilitare la sincronizzazione di DAVdroid dopo alcuni giorni. Per prevenire questo comportamento disabilita l\'ottimizzazione della batteria</string>
+  <string name="startup_battery_optimization_disable">Disabilita per DAVdroid</string>
+  <string name="startup_dont_show_again">Non mostrare più</string>
+  <string name="startup_development_version">Versione di sviluppo di DAVdroid</string>
+  <string name="startup_development_version_message">Questa è una versione di sviluppo di DAVdroid. Attenzione perché potrebbe avere malfunzionamenti. Inviateci consigli utili per migliorarlo.</string>
+  <string name="startup_development_version_give_feedback">Invia un rapporto</string>
+  <string name="startup_donate">Informazioni sull\'Open-Source</string>
+  <string name="startup_donate_message">Siamo soddisfatti del tuo uso di DAVdroid, programma Open-Source (GPLv3). Poiché lo sviluppo è un\'iniziativa complessa che comporta molte ore di lavoro ti invitiamo a fare una donazione.</string>
+  <string name="startup_donate_now">Mostra pagina donazioni</string>
+  <string name="startup_donate_later">Più tardi</string>
+  <string name="startup_google_play_accounts_removed">Informazioni sul bug del DRM di Play Store</string>
+  <string name="startup_google_play_accounts_removed_message">In alcune condizioni il DRM di Play Store può causare la perdita di tutti gli account DAVdroid dopo un riavvio o dopo un aggiornamento di DAVdroid. Se verificate questo problema installate successivamente \"DAVdroid JB Workaround\" da Play Store.</string>
+  <string name="startup_google_play_accounts_removed_more_info">Maggiori informazioni</string>
+  <string name="startup_opentasks_not_installed">OpenTasks non installata</string>
+  <string name="startup_opentasks_not_installed_message">L\'applicazione OpenTasks non è installata: di conseguenza DAVdroid non potrà sincronizzare l\'elenco delle attività.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Dopo l\'installazione di OpenTasks è necessario INSTALLARE NUOVAMENTE DAVdroid e aggiungere ancora gli account (per un bug di Android).</string>
+  <string name="startup_opentasks_not_installed_install">Installa OpenTasks</string>
+  <!--AboutActivity-->
+  <string name="about_license_terms">Termini di licenza</string>
+  <string name="about_license_info_no_warranty">Il programma è distribuito SENZA ALCUNA GARANZIA. È software libero e può essere redistribuito sotto alcune condizioni.</string>
+  <!--global settings-->
+  <string name="logging_davdroid_file_logging">Invio del log di DAVdroid su file</string>
+  <string name="logging_to_external_storage">Log su dispositivo esterno: %s</string>
+  <string name="logging_to_external_storage_warning">Cancellare prima possibile i file di log!</string>
+  <string name="logging_couldnt_create_file">Non riesco a creare il file di log esterno: %s</string>
+  <string name="logging_no_external_storage">Dispositivo esterno non disponibile</string>
+  <!--AccountsActivity-->
+  <string name="navigation_drawer_subtitle">CalDAV/CardDAV adattatore di sincronizzazione</string>
+  <string name="navigation_drawer_about">Informazioni / Licenza</string>
+  <string name="navigation_drawer_settings">Impostazioni</string>
+  <string name="navigation_drawer_news_updates">Notizie &amp; aggiornamenti</string>
+  <string name="navigation_drawer_external_links">Link esterni</string>
+  <string name="navigation_drawer_website">Sito web</string>
+  <string name="navigation_drawer_faq">Domande Frequenti</string>
+  <string name="navigation_drawer_forums">Comunità</string>
+  <string name="navigation_drawer_donate">Donazione</string>
+  <string name="account_list_empty">Benvenuto a DAVdroid!\n\nÈ ora possibile aggiungere account CalDAV/CardDAV.</string>
+  <!--DavService-->
+  <string name="dav_service_refresh_failed">Fallita l\'individuazione dei servizi</string>
+  <string name="dav_service_refresh_couldnt_refresh">Impossibile rinnovare la lista delle collezioni</string>
+  <!--AppSettingsActivity-->
+  <string name="app_settings">Impostazioni</string>
+  <string name="app_settings_user_interface">Interfaccia utente</string>
+  <string name="app_settings_reset_hints">Reimposta i suggerimenti</string>
+  <string name="app_settings_reset_hints_summary">Riabilita i suggerimenti precedentemente disabilitati</string>
+  <string name="app_settings_reset_hints_success">I suggerimenti verranno mostrati</string>
+  <string name="app_settings_connection">Connessione</string>
+  <string name="app_settings_override_proxy">Non rispettare la impostazioni del proxy</string>
+  <string name="app_settings_override_proxy_on">Impostazioni personalizzate del proxy</string>
+  <string name="app_settings_override_proxy_off">Usa le impostazioni di sistema del proxy</string>
+  <string name="app_settings_override_proxy_host">Nome host del proxy HTTP</string>
+  <string name="app_settings_override_proxy_port">Porta del proxy HTTP</string>
+  <string name="app_settings_security">Sicurezza</string>
+  <string name="app_settings_distrust_system_certs">Non ti fidare dei certificati di sistema</string>
+  <string name="app_settings_distrust_system_certs_on">Le CA di sistema e quelle aggiunte dall\'utente non sono affidabili</string>
+  <string name="app_settings_distrust_system_certs_off">Le CA di sistema e quelle aggiunte dall\'utente sono affidabili (raccomandato)</string>
+  <string name="app_settings_reset_certificates">Reimposta la fiducia in tutti i certificati</string>
+  <string name="app_settings_reset_certificates_summary">Reimposta la fiducia nei certificati aggiunti</string>
+  <string name="app_settings_reset_certificates_success">Sono stati cancellati tutti i certificati aggiunti</string>
+  <string name="app_settings_debug">Debug</string>
+  <string name="app_settings_log_to_external_storage">Log su file esterno</string>
+  <string name="app_settings_log_to_external_storage_on">Log su dispositivo esterno (se disponibile)</string>
+  <string name="app_settings_log_to_external_storage_off">Log su file esterno disabilitato</string>
+  <string name="app_settings_show_debug_info">Mostra informazioni di debug</string>
+  <string name="app_settings_show_debug_info_details">Mostra e condividi i dettagli del programma e della configurazione</string>
+  <!--AccountActivity-->
+  <string name="account_synchronize_now">Sincronizza adesso</string>
+  <string name="account_synchronizing_now">Sincronizzazione in corso</string>
+  <string name="account_settings">Impostazioni account</string>
+  <string name="account_delete">Elimina account</string>
+  <string name="account_delete_confirmation_title">Cancellare l\'account?</string>
+  <string name="account_delete_confirmation_text">Tutte le copie locali delle rubriche, dei calendari e degli elenchi attività verranno eliminate.</string>
+  <string name="account_refresh_address_book_list">Aggiorna elenco degli indirizzari</string>
+  <string name="account_create_new_address_book">Crea un nuovo indirizzario</string>
+  <string name="account_refresh_calendar_list">Aggiorna lista calendari</string>
+  <string name="account_create_new_calendar">Crea nuovo calendario</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">Permessi DAVdroid</string>
+  <string name="permissions_calendar">Permessi calendario</string>
+  <string name="permissions_calendar_details">Per sincronizzare gli eventi CalDAV con i calendari locali DAVdroid deve avere l\'accesso ai tuoi calendari.</string>
+  <string name="permissions_calendar_request">Richiesta autorizzazione al calendario</string>
+  <string name="permissions_contacts">Permessi Contatti</string>
+  <string name="permissions_contacts_details">Per sincronizzare l\'indirizzario CardDAV con i contatti locali DAVdroid deve avere l\'accesso ai tuoi contatti.</string>
+  <string name="permissions_contacts_request">Richiesta autorizzazione ai contatti</string>
+  <string name="permissions_opentasks">Permessi OpenTasks</string>
+  <string name="permissions_opentasks_details">Per sincronizzazione l\'elenco attività di CalDAV con l\'elenco locale DAVdroid deve avere l\'accesso  ad OpenTasks.</string>
+  <string name="permissions_opentasks_request">Richiesta autorizzazione ad OpenTasks</string>
+  <!--AddAccountActivity-->
+  <string name="login_title">Aggiungi account</string>
+  <string name="login_type_email">Accedi con indirizzo email</string>
+  <string name="login_email_address">Indirizzo email</string>
+  <string name="login_email_address_error">È necessario un indirizzo email valido</string>
+  <string name="login_password">Password</string>
+  <string name="login_password_required">Password richiesta</string>
+  <string name="login_type_url">Accedi con URL e nome utente</string>
+  <string name="login_url_must_be_http_or_https">L\'URL deve iniziare con http(s)://</string>
+  <string name="login_url_host_name_required">Nome host richiesto</string>
+  <string name="login_user_name">Nome utente</string>
+  <string name="login_user_name_required">Nome utente richiesto</string>
+  <string name="login_base_url">Base URL</string>
+  <string name="login_login">Login</string>
+  <string name="login_back">Indietro</string>
+  <string name="login_create_account">Crea account</string>
+  <string name="login_account_name">Nome account</string>
+  <string name="login_account_name_info">Inserisci il tuo indirizzo email come nome dell\'account in quanto Android userà il nome dell\'account nel campo ORGANIZER degli eventi creati. Non è possibile avere due account con nome uguale.</string>
+  <string name="login_account_contact_group_method">Metodo del contact group:</string>
+  <string name="login_account_name_required">Richiesto il nome dell\'account</string>
+  <string name="login_account_not_created">L\'account non può essere creato</string>
+  <string name="login_configuration_detection">Rilevazione configurazione</string>
+  <string name="login_querying_server">Attendere, invio richiesta al server...</string>
+  <string name="login_no_caldav_carddav">Impossibile trovare servizi CalDAV o CardDAV.</string>
+  <string name="login_view_logs">Vedi i log</string>
+  <!--AccountSettingsActivity-->
+  <string name="settings_title">Impostazioni: %s</string>
+  <string name="settings_authentication">Autenticazione</string>
+  <string name="settings_username">Nome utente</string>
+  <string name="settings_enter_username">Inserisci nome utente:</string>
+  <string name="settings_password">Password</string>
+  <string name="settings_password_summary">Aggiorna la password come sul tuo server.</string>
+  <string name="settings_enter_password">Inserisci la tua password:</string>
+  <string name="settings_sync">Sincronizzazione</string>
+  <string name="settings_sync_interval_contacts">Intervallo sincr. Contatti</string>
+  <string name="settings_sync_summary_manually">Solo manualmente</string>
+  <string name="settings_sync_summary_periodically" tools:ignore="PluralsCandidate">Ogni %d minuti e a seguito di ogni cambiamento locale</string>
+  <string name="settings_sync_summary_not_available">Non disponile</string>
+  <string name="settings_sync_interval_calendars">Intervallo sincr. calendari</string>
+  <string name="settings_sync_interval_tasks">Intervallo sincr. attività</string>
+  <string-array name="settings_sync_interval_seconds">
+    <item>-1</item>
+    <item>300</item>
+    <item>600</item>
+    <item>900</item>
+    <item>3600</item>
+    <item>7200</item>
+    <item>14400</item>
+    <item>86400</item>
+  </string-array>
+  <string-array name="settings_sync_interval_names">
+    <item>Solo manualmente</item>
+    <item>Ogni 5 minuti</item>
+    <item>Ogni 10 minuti</item>
+    <item>Ogni 15 minuti</item>
+    <item>Ogni ora</item>
+    <item>Ogni 2 ore</item>
+    <item>Ogni 4 ore</item>
+    <item>Una volta al giorno</item>
+  </string-array>
+  <string name="settings_sync_wifi_only">Sincr. solo tramite WiFi</string>
+  <string name="settings_sync_wifi_only_on">La sincronizzazione è limitata alle connessioni WiFi</string>
+  <string name="settings_sync_wifi_only_ssid">Restrizione sul SSID del WiFi</string>
+  <string name="settings_sync_wifi_only_ssid_on">La sincronizzazione avverrà solo con %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Verranno usate tutte le connessioni WiFi</string>
+  <string name="settings_sync_wifi_only_ssid_message">Inserisci il nome di una rete WiFi (SSID) per limitare la sincronizzazione solo con questa rete o lasciare in bianco per usare tutte le connessioni WiFi.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>I gruppi sono VCards separate</item>
+    <item>I gruppi sono categorie per ogni contatto</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
+  <string name="settings_sync_time_range_past">Limite di tempo per gli eventi trascorsi</string>
+  <string name="settings_sync_time_range_past_none">Verranno sincronizzati tutti gli eventi</string>
+  <plurals name="settings_sync_time_range_past_days">
+    <item quantity="one">Eventi più vecchi di un giorno saranno ignorati</item>
+    <item quantity="other">Eventi più vecchi di %d giorni saranno ignorati</item>
+  </plurals>
+  <string name="settings_sync_time_range_past_message">Eventi più vecchi di questo numero di giorni verranno ignorati(può anche essere 0). Lasciare in bianco per sincronizzare tutti gli eventi.</string>
+  <string name="settings_manage_calendar_colors">Cambia il colore del calendario</string>
+  <string name="settings_manage_calendar_colors_on">I colori dei calendari sono gestiti da DAVdroid</string>
+  <string name="settings_manage_calendar_colors_off">I colori dei calendari non sono gestiti da DAVdroid</string>
+  <string name="settings_version_update">Aggiorna la versione di DAVdroid</string>
+  <string name="settings_version_update_settings_updated">Le impostazioni sono state aggiornate.</string>
+  <string name="settings_version_update_install_hint">Problemi? Disinstalla e poi re-installa DAVdroid.</string>
+  <!--collection management-->
+  <string name="create_addressbook">Crea indirizzario</string>
+  <string name="create_addressbook_display_name_hint">Il mio indirizzario</string>
+  <string name="create_calendar_display_name_hint">Mio calendario</string>
+  <string name="create_calendar_time_zone">Fuso orario:</string>
+  <string name="create_calendar_type_only_events">Calendario (solo eventi)</string>
+  <string name="create_calendar_type_only_tasks">Elenco attività (solo attività)</string>
+  <string name="create_calendar_type_events_and_tasks">Combinato (eventi e attività)</string>
+  <string name="create_collection_display_name_required">Il titolo è richiesto</string>
+  <string name="create_collection_description">Descrizione (opzionale):</string>
+  <string name="create_collection_create">Crea</string>
+  <string name="delete_collection_confirm_title">Sei sicuro?</string>
+  <!--ExceptionInfoFragment-->
+  <string name="exception">Si è verificato un errore.</string>
+  <string name="exception_httpexception">Si è verificato un errore HTTP.</string>
+  <string name="exception_ioexception">Si è verificato un errore di I/O.</string>
+  <string name="exception_show_details">Mostra dettagli</string>
+  <!--sync errors and DebugInfoActivity-->
+  <string name="debug_info_title">Informazioni di debug</string>
+  <string name="sync_error_permissions">Autorizzazioni DAVdroid</string>
+  <string name="sync_error_permissions_text">Autorizzazioni addizionali richieste</string>
+  <string name="sync_error_calendar">Sincronizzazione del calendario fallita (%s)</string>
+  <string name="sync_error_contacts">Sincronizzazione dell\'indirizzario fallita (%s)</string>
+  <string name="sync_error_tasks">Sincronizzazione delle attività fallita (%s)</string>
+  <string name="sync_error">Errore nel %s</string>
+  <string name="sync_error_http_dav">Errore del server nel %s</string>
+  <string name="sync_error_local_storage">Errore del database nel %s</string>
+  <string-array name="sync_error_phases">
+    <item>inizio sincronizzazione</item>
+    <item>controllo caratteristiche del server</item>
+    <item>elaborazione voci cancellate in locale</item>
+    <item>elaborazione voci create o modificate</item>
+    <item>invio voci create o modificate</item>
+    <item>controllo stato della sincronizzazione</item>
+    <item>elenco voci locali</item>
+    <item>elenco voci remote</item>
+    <item>confronto voci locali e remote</item>
+    <item>download voci remote</item>
+    <item>post-processing</item>
+    <item>salvataggio stato della sincronizzazione</item>
+  </string-array>
+  <string name="sync_error_unauthorized">Nome utente o password errati</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: sicurezza della connessione</string>
+  <string name="trust_certificate_unknown_certificate_found">DAVdroid ha trovato un certificato sconosciuto. Ritenerlo affidabile?</string>
+</resources>

app/src/davdroid/res/values-ja/strings.xml

@@ -7,6 +7,9 @@
   <string name="please_wait">しばらくお待ちください …</string>
   <string name="send">送信</string>
   <!--startup dialogs-->
+  <string name="startup_battery_optimization">バッテリー最適化</string>
+  <string name="startup_battery_optimization_message">Android は数日後に DAVdroid の同期を無効にする/減らすことがあります。これを防止するには、バッテリー最適化をオフにしてください。</string>
+  <string name="startup_battery_optimization_disable">DAVdroid 用にオフにする</string>
   <string name="startup_dont_show_again">次回から表示しない</string>
   <string name="startup_development_version">DAVdroid プレビュー リリース</string>
   <string name="startup_development_version_message">これは DAVdroid の開発版です。期待した通りに動作しない可能性があることにご注意ください。私たちが DAVdroid を改善するために、建設的なフィードバックをお願いします。</string>
@@ -19,7 +22,8 @@
   <string name="startup_google_play_accounts_removed_message">特定の条件下で、DAVdroid を再起動後またはアップグレードした後、Play ストア DRM によりすべての DAVdroid アカウントがなくなる可能性があります。この問題の影響を受けている場合 (のみ)、Play ストアから「DAVdroid JB 回避策」をインストールしてください。</string>
   <string name="startup_google_play_accounts_removed_more_info">追加情報</string>
   <string name="startup_opentasks_not_installed">OpenTasks がインストールされていません</string>
-  <string name="startup_opentasks_not_installed_message">OpenTasks アプリがインストールされていないか、アクセスできないため、DAVdroid は、タスクリストを同期することができません。 OpenTasks をインストールした後、DAVdroidを再インストールして、再度アカウントを追加してください。</string>
+  <string name="startup_opentasks_not_installed_message">OpenTasks アプリが利用できないため、DAVdroid はタスクリストを同期することができません。</string>
+  <string name="startup_opentasks_reinstall_davdroid">OpenTasks をインストールした後で、DAVdroidを再インストールして、再度アカウントを追加してください (Android のバグ)。</string>
   <string name="startup_opentasks_not_installed_install">OpenTasks をインストール</string>
   <!--AboutActivity-->
   <string name="about_license_terms">ライセンス規約</string>
@@ -52,12 +56,19 @@
   <string name="app_settings_reset_hints">ヒントをリセット</string>
   <string name="app_settings_reset_hints_summary">以前非表示にしたヒントを、再度有効にします</string>
   <string name="app_settings_reset_hints_success">すべてのヒントが再度表示されます</string>
+  <string name="app_settings_connection">接続</string>
+  <string name="app_settings_override_proxy">プロキシ設定を上書き</string>
+  <string name="app_settings_override_proxy_on">カスタムのプロキシ設定を使用する</string>
+  <string name="app_settings_override_proxy_off">システムデフォルトのプロキシ設定を使用する</string>
+  <string name="app_settings_override_proxy_host">HTTP プロキシのホスト名</string>
+  <string name="app_settings_override_proxy_port">HTTP プロキシのポート</string>
   <string name="app_settings_security">セキュリティ</string>
-  <string name="app_settings_reset_trusted_certificates">信頼済証明書をリセット</string>
-  <string name="app_settings_reset_trusted_certificates_summary">以前承認されたすべての証明書を忘れます</string>
-  <plurals name="app_settings_reset_trusted_certificates_success">
-    <item quantity="other">%d 証明書の信頼を解除しました</item>
-  </plurals>
+  <string name="app_settings_distrust_system_certs">システム証明書の信頼を解除</string>
+  <string name="app_settings_distrust_system_certs_on">システムとユーザーが追加したCAを信頼しない</string>
+  <string name="app_settings_distrust_system_certs_off">システムとユーザーが追加したCAを信頼する (推奨)</string>
+  <string name="app_settings_reset_certificates">(未)信頼済証明書をリセット</string>
+  <string name="app_settings_reset_certificates_summary">すべてのカスタム証明書の信頼をリセット</string>
+  <string name="app_settings_reset_certificates_success">すべてのカスタム証明書をクリアしました</string>
   <string name="app_settings_debug">デバッグ</string>
   <string name="app_settings_log_to_external_storage">外部ファイルにログ出力</string>
   <string name="app_settings_log_to_external_storage_on">(可能な場合) 外部ストレージにログ出力します</string>
@@ -75,6 +86,17 @@
   <string name="account_create_new_address_book">新しいアドレス帳を作成</string>
   <string name="account_refresh_calendar_list">カレンダーリストを更新</string>
   <string name="account_create_new_calendar">新しいカレンダーを作成</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">DAVdroid アクセス許可</string>
+  <string name="permissions_calendar">カレンダー アクセス許可</string>
+  <string name="permissions_calendar_details">ローカルのカレンダーと CalDAV イベントを同期するため、DAVdroid がカレンダーにアクセスする必要があります。</string>
+  <string name="permissions_calendar_request">カレンダー アクセス許可の要求</string>
+  <string name="permissions_contacts">連絡先アクセス許可</string>
+  <string name="permissions_contacts_details">ローカルの連絡先と CalDAV アドレス帳を同期するため、DAVdroid が連絡先にアクセスする必要があります。</string>
+  <string name="permissions_contacts_request">連絡先アクセス許可の要求</string>
+  <string name="permissions_opentasks">OpenTasks アクセス許可</string>
+  <string name="permissions_opentasks_details">ローカルのタスクリストと CalDAV タスクを同期するため、DAVdroid が OpenTasks にアクセスする必要があります。</string>
+  <string name="permissions_opentasks_request">OpenTasks アクセス許可の要求</string>
   <!--AddAccountActivity-->
   <string name="login_title">アカウントを追加</string>
   <string name="login_type_email">メールアドレスでログイン</string>
@@ -88,12 +110,12 @@
   <string name="login_user_name">ユーザー名</string>
   <string name="login_user_name_required">ユーザー名が必要です</string>
   <string name="login_base_url">ベース URL</string>
-  <string name="login_auth_preemptive">プリエンプティブ認証 (推奨ですが、ダイジェスト認証と互換性がありません)</string>
   <string name="login_login">ログイン</string>
   <string name="login_back">戻る</string>
   <string name="login_create_account">アカウントを作成</string>
   <string name="login_account_name">アカウント名</string>
   <string name="login_account_name_info">Android はあなたが作成した予定の ORGANIZER フィールドとしてアカウント名を使用するので、アカウント名としてメールアドレスを使用してください。同じ名前のアカウントを 2 つ持つことはできません。</string>
+  <string name="login_account_contact_group_method">連絡先グループ方法:</string>
   <string name="login_account_name_required">アカウント名が必要です</string>
   <string name="login_account_not_created">アカウントを作成できません</string>
   <string name="login_configuration_detection">設定の検出</string>
@@ -108,9 +130,6 @@
   <string name="settings_password">パスワード</string>
   <string name="settings_password_summary">ご利用のサーバーに従ってパスワードを更新します。</string>
   <string name="settings_enter_password">パスワードを入力:</string>
-  <string name="settings_preemptive">プリエンプティブ認証</string>
-  <string name="settings_preemptive_on">すべてのリクエストで資格情報を送信します (推奨)</string>
-  <string name="settings_preemptive_off">サーバーが要求した後、資格情報を送信します</string>
   <string name="settings_sync">同期</string>
   <string name="settings_sync_interval_contacts">連絡先同期間隔</string>
   <string name="settings_sync_summary_manually">手動のみ</string>
@@ -118,16 +137,6 @@
   <string name="settings_sync_summary_not_available">利用不可</string>
   <string name="settings_sync_interval_calendars">カレンダー同期間隔</string>
   <string name="settings_sync_interval_tasks">タスク同期間隔</string>
-  <string-array name="settings_sync_interval_seconds">
-    <item>-1</item>
-    <item>300</item>
-    <item>600</item>
-    <item>900</item>
-    <item>3600</item>
-    <item>7200</item>
-    <item>14400</item>
-    <item>86400</item>
-  </string-array>
   <string-array name="settings_sync_interval_names">
     <item>手動のみ</item>
     <item>5 分ごと</item>
@@ -138,12 +147,29 @@
     <item>4 時間ごと</item>
     <item>1 日 1 回</item>
   </string-array>
+  <string name="settings_sync_wifi_only">WiFi でのみ同期</string>
+  <string name="settings_sync_wifi_only_on">同期は WiFi 接続に制限されます</string>
+  <string name="settings_sync_wifi_only_off">接続の種類は考慮されません</string>
+  <string name="settings_sync_wifi_only_ssid">WiFi SSID 制限</string>
+  <string name="settings_sync_wifi_only_ssid_on">%s でのみ同期します</string>
+  <string name="settings_sync_wifi_only_ssid_off">すべての WiFi 接続を使用することができます</string>
+  <string name="settings_sync_wifi_only_ssid_message">このネットワークで同期を制限する WiFi ネットワーク (SSID) の名前を入力してください。すべての WiFi 接続は空白のままにします。</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">連絡先グループ方法</string>
+  <string-array name="settings_contact_group_method_entries">
+    <item>グループは個別の VCards</item>
+    <item>グループは連絡先カテゴリーごと</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
   <string name="settings_sync_time_range_past">過去イベントの時間限度</string>
   <string name="settings_sync_time_range_past_none">すべてのイベントが同期されます</string>
   <plurals name="settings_sync_time_range_past_days">
     <item quantity="other">%d 日より前のイベントは無視されます</item>
   </plurals>
   <string name="settings_sync_time_range_past_message">この日数より過去のイベントは無視されます (0 も可)。すべてのイベントを同期させるには、空白のままにしてください。</string>
+  <string name="settings_manage_calendar_colors">カレンダーの色を管理</string>
+  <string name="settings_manage_calendar_colors_on">カレンダーの色は DAVdroid が管理します</string>
+  <string name="settings_manage_calendar_colors_off">カレンダーの色を DAVdroid が設定しません</string>
   <string name="settings_version_update">DAVdroid バージョンの更新</string>
   <string name="settings_version_update_settings_updated">内部設定が更新されました。</string>
   <string name="settings_version_update_install_hint">問題がありますか? DAVdroid をアンインストールして、再度インストールしてください。</string>
@@ -175,6 +201,8 @@
   <string name="exception_show_details">詳細を表示</string>
   <!--sync errors and DebugInfoActivity-->
   <string name="debug_info_title">デバッグ情報</string>
+  <string name="sync_error_permissions">DAVdroid アクセス許可</string>
+  <string name="sync_error_permissions_text">追加のアクセス許可が必要です</string>
   <string name="sync_error_calendar">カレンダーの同期に失敗しました (%s)</string>
   <string name="sync_error_contacts">アドレス帳の同期に失敗しました (%s)</string>
   <string name="sync_error_tasks">タスクの同期に失敗しました (%s)</string>
@@ -192,7 +220,11 @@
     <item>リモートのエントリーをリスト中</item>
     <item>ローカル/リモートのエントリーを比較中</item>
     <item>リモートのエントリーをダウンロード中</item>
+    <item>後処理中</item>
     <item>同期の状態を保存中</item>
   </string-array>
   <string name="sync_error_unauthorized">ユーザー名/パスワードが間違っています</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: 接続セキュリティ</string>
+  <string name="trust_certificate_unknown_certificate_found">DAVdroidは、未知の証明書を検出しました。それを信頼しますか?</string>
 </resources>

app/src/davdroid/res/values-nl/strings.xml

@@ -0,0 +1,239 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!--common strings-->
+  <string name="app_name">DAVdroid</string>
+  <string name="help">Help</string>
+  <string name="manage_accounts">Beheer accounts</string>
+  <string name="please_wait">Een moment geduld...</string>
+  <string name="send">Verzenden</string>
+  <!--startup dialogs-->
+  <string name="startup_battery_optimization">Batterij optimalisatie</string>
+  <string name="startup_battery_optimization_message">Android kan mogelijk de DAVdroid synchronisatie stoppen na een paar dagen. Om dit te voorkomen zet u de batterij optimalisatie uit.</string>
+  <string name="startup_battery_optimization_disable">DAVdroid afsluiten</string>
+  <string name="startup_dont_show_again">Niet opnieuw weergeven</string>
+  <string name="startup_development_version">DAVdroid voorlopige versie</string>
+  <string name="startup_development_version_message">Dit is een ontwikkelversie van DAVdroid. Het kan zijn dat dingen niet werken zoals verwacht. Geef ons constructieve feedback om DAVdroid te verbeteren.</string>
+  <string name="startup_development_version_give_feedback">Feedback geven</string>
+  <string name="startup_donate">Open-Source informatie</string>
+  <string name="startup_donate_message">We zijn blij dat je DAVdroid gebruikt, wat open-source software (GPLv3) is. Omdat de ontwikkeling van DAVdroid hard werk is en duizenden uren in beslag neemt. overweeg alstublieft een donatie.</string>
+  <string name="startup_donate_now">Toon donatie pagina</string>
+  <string name="startup_donate_later">Misschien later</string>
+  <string name="startup_google_play_accounts_removed">Play Store DRM fout-informatie</string>
+  <string name="startup_google_play_accounts_removed_message">Onder bepaalde omstandigheden, kan Play Store DRM ervoor zorgen dat accounts kwijt zijn na een herstart of na een DAVdroid update. Als dit probleem zich bij je voordoet (en alleen dan), Installeer dan \"DAVdroid JB Workaround\" vanuit de Play Store</string>
+  <string name="startup_google_play_accounts_removed_more_info">Meer informatie</string>
+  <string name="startup_opentasks_not_installed">OpenTasks niet geinstalleerd</string>
+  <string name="startup_opentasks_not_installed_message">De OpenTasks app is niet beschikbaar, Hierdoor is het voor DAVdroid niet mogelijk om uw taken te synchroniseren.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Na installatie van OpenTasks dient u DAVdroid opnieuw te installeren en de accounts toe te voegen (Android bug).</string>
+  <string name="startup_opentasks_not_installed_install">OpenTasks installeren</string>
+  <!--AboutActivity-->
+  <string name="about_license_terms">Licentie voorwaarden</string>
+  <string name="about_license_info_no_warranty">Dit programma kom met ABSOLUUT GEEN GARANTIE. Het is gratis software, en je bent welkom dit te herdistribueren onder bepaalde voorwaarden.</string>
+  <!--global settings-->
+  <string name="logging_davdroid_file_logging">DAVDroid bestand loggen</string>
+  <string name="logging_to_external_storage">Loggen naar externe opslag: %s</string>
+  <string name="logging_to_external_storage_warning">Verwijder logs zo snel mogelijk</string>
+  <string name="logging_couldnt_create_file">Kon extern log bestand niet verwijderen: %s</string>
+  <string name="logging_no_external_storage">Externe opslag niet gevonden</string>
+  <!--AccountsActivity-->
+  <string name="navigation_drawer_open">Open navigatie drawer</string>
+  <string name="navigation_drawer_close">Sluit navigatie drawer</string>
+  <string name="navigation_drawer_subtitle">CalDAV/CardDav Sync adapter</string>
+  <string name="navigation_drawer_about">Over / Licentie</string>
+  <string name="navigation_drawer_settings">Instellingen</string>
+  <string name="navigation_drawer_news_updates">Nieuws &amp; updates</string>
+  <string name="navigation_drawer_external_links">Externe links</string>
+  <string name="navigation_drawer_website">Website</string>
+  <string name="navigation_drawer_faq">FAQ</string>
+  <string name="navigation_drawer_forums">Community</string>
+  <string name="navigation_drawer_donate">Doneren</string>
+  <string name="account_list_empty">Welkom bij DAVdroid!\n\nJe kunt nu een CalDAV/CardDAv account toevoegen.</string>
+  <!--DavService-->
+  <string name="dav_service_refresh_failed">Service herkenning is mislukt</string>
+  <string name="dav_service_refresh_couldnt_refresh">Kon de collectie lijst niet vernieuwen</string>
+  <!--AppSettingsActivity-->
+  <string name="app_settings">Instellingen</string>
+  <string name="app_settings_user_interface">Gebruikers interface</string>
+  <string name="app_settings_reset_hints">Hints resetten </string>
+  <string name="app_settings_reset_hints_summary">Hints die al gezien zijn opnieuw weergeven</string>
+  <string name="app_settings_reset_hints_success">Alle hints worden opnieuw weergegeven</string>
+  <string name="app_settings_security">Beveiliging</string>
+  <string name="app_settings_distrust_system_certs">Systeem certificaten niet vertrouwen</string>
+  <string name="app_settings_distrust_system_certs_on">Systeem en CAs van toegevoegde gebruiker wordt niet vertrouwd</string>
+  <string name="app_settings_distrust_system_certs_off">Systeem en CAs van toegevoegde gebruiker wordt vertrouwd (aanbevolen)</string>
+  <string name="app_settings_reset_certificates">Resetten (niet) vertrouwde certificaten</string>
+  <string name="app_settings_reset_certificates_summary">Resetten alle bewerkte certificaten</string>
+  <string name="app_settings_reset_certificates_success">Alle bewerkte certificaten zijn vrijgemaakt</string>
+  <string name="app_settings_debug">Debuggen</string>
+  <string name="app_settings_log_to_external_storage">Log naar extern bestand</string>
+  <string name="app_settings_log_to_external_storage_on">Loggen naar externe opslag (wanneer beschikbaar)</string>
+  <string name="app_settings_log_to_external_storage_off">Extern bestands loggen uitgeschakeld</string>
+  <string name="app_settings_show_debug_info">Debug info tonen</string>
+  <string name="app_settings_show_debug_info_details">Bekijk/deel software configuratie details</string>
+  <!--AccountActivity-->
+  <string name="account_synchronize_now">Synchroniseer nu</string>
+  <string name="account_synchronizing_now">Aan het synchronizeren...</string>
+  <string name="account_settings">Account instellingen</string>
+  <string name="account_delete">Account verwijderen</string>
+  <string name="account_delete_confirmation_title">Account echt verwijderen?</string>
+  <string name="account_delete_confirmation_text">Alle lokale kopieën van adresboeken, agenda\'s en taken worden verwijderd.</string>
+  <string name="account_refresh_address_book_list">Adresboeken vernieuwen</string>
+  <string name="account_create_new_address_book">Maak een nieuw adresboek</string>
+  <string name="account_refresh_calendar_list">Agenda\'s vernieuwen</string>
+  <string name="account_create_new_calendar">Maak een nieuwe agenda</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">DAVdroid rechten</string>
+  <string name="permissions_calendar">Agenda rechten</string>
+  <string name="permissions_calendar_details">Om CalDAV afspraken te synchroniseren met u agenda dient DAVdroid toegang te verkrijgen. </string>
+  <string name="permissions_calendar_request">Agenda rechten verkrijgen</string>
+  <string name="permissions_contacts">Contact rechten</string>
+  <string name="permissions_contacts_details">Om CalDAV afspraken te synchroniseren met u contacten dient DAVdroid toegang te verkrijgen. </string>
+  <string name="permissions_contacts_request">Contacten rechten verkrijgen</string>
+  <string name="permissions_opentasks">OpenTasks rechten</string>
+  <string name="permissions_opentasks_details">Om CalDAV taken te synchroniseren met uw local takenlijst dient DAVdroid toegang te hebben tot OpenTasks</string>
+  <string name="permissions_opentasks_request">OpenTasks rechten verkrijgen</string>
+  <!--AddAccountActivity-->
+  <string name="login_title">Account toevoegen</string>
+  <string name="login_type_email">Inloggen met e-mailadres</string>
+  <string name="login_email_address">Email adres</string>
+  <string name="login_email_address_error">Geldig email adres vereist</string>
+  <string name="login_password">Wachtwoord</string>
+  <string name="login_password_required">Wachtwoord vereist</string>
+  <string name="login_type_url">Inloggen met URL en gebruikersnaam</string>
+  <string name="login_url_must_be_http_or_https">URL moet met http(s):// beginnen</string>
+  <string name="login_url_host_name_required">Hostnaam vereist</string>
+  <string name="login_user_name">Gebruikersnaam</string>
+  <string name="login_user_name_required">Gebruikersnaam vereist</string>
+  <string name="login_base_url">Basis URL</string>
+  <string name="login_login">Login</string>
+  <string name="login_back">Terug</string>
+  <string name="login_create_account">Maak een account</string>
+  <string name="login_account_name">Accountnaam</string>
+  <string name="login_account_name_info">Gebruik je email adres als account naam want Android zal je account naam gebruiken als ORGANIZER veld voor gemaakte afspraken. Je kunt geen 2 accounts met dezelfde naam hebben,</string>
+  <string name="login_account_contact_group_method">Contact groep methode:</string>
+  <string name="login_account_name_required">Accountnaam vereist</string>
+  <string name="login_account_not_created">Account kon niet gemaakt worden.</string>
+  <string name="login_configuration_detection">Configuratie detectie</string>
+  <string name="login_querying_server">Even geduld, verzoek naar server...</string>
+  <string name="login_no_caldav_carddav">Kon geen CalDAV of CardDAV service vinden.</string>
+  <string name="login_view_logs">Bekijk logs</string>
+  <!--AccountSettingsActivity-->
+  <string name="settings_title">Instellingen: %s</string>
+  <string name="settings_authentication">Authenticatie</string>
+  <string name="settings_username">Gebruikersnaam</string>
+  <string name="settings_enter_username">Gebruikersnaam invoeren:</string>
+  <string name="settings_password">Wachtwoord</string>
+  <string name="settings_password_summary">Gebruik het zelfde wachtwoord als op de server.</string>
+  <string name="settings_enter_password">Wachtwoord invoeren:</string>
+  <string name="settings_sync">Synchronisatie</string>
+  <string name="settings_sync_interval_contacts">Contacten verversen</string>
+  <string name="settings_sync_summary_manually">Alleen handmatig</string>
+  <string name="settings_sync_summary_periodically" tools:ignore="PluralsCandidate">Elke %d minuten + meteen na wijziging</string>
+  <string name="settings_sync_summary_not_available">Niet beschikbaar</string>
+  <string name="settings_sync_interval_calendars">Agenda\'s verversen</string>
+  <string name="settings_sync_interval_tasks">Taak sync. tussentijd</string>
+  <string-array name="settings_sync_interval_seconds">
+    <item>-1</item>
+    <item>300</item>
+    <item>600</item>
+    <item>900</item>
+    <item>3600</item>
+    <item>7200</item>
+    <item>14400</item>
+    <item>86400</item>
+  </string-array>
+  <string-array name="settings_sync_interval_names">
+    <item>Alleen handmatig</item>
+    <item>Elke 5 minuten</item>
+    <item>Elke 10 minuten</item>
+    <item>Elke 15 minuten</item>
+    <item>Elk uur</item>
+    <item>Elke 2 uur</item>
+    <item>Elke 4 uur</item>
+    <item>Dagelijks</item>
+  </string-array>
+  <string name="settings_sync_wifi_only">Sync alleen tijdens WiFi</string>
+  <string name="settings_sync_wifi_only_on">Synchronisatie is voorbehouden tijdens WiFi verbindingen</string>
+  <string name="settings_sync_wifi_only_off">Verbinding type is niet overwogen</string>
+  <string name="settings_sync_wifi_only_ssid">WiFi SSID beperking</string>
+  <string name="settings_sync_wifi_only_ssid_on">Zal alleen synchroniseren over %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Alle WiFI verbindingen mogen worden gebruikt</string>
+  <string name="settings_sync_wifi_only_ssid_message">Type de naam van het WiFi netwerk (SSID) om synchronisatie tot dit netwerk te beperken. Leeg laten voor sync over alle netwerken.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">Contact groep methode</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>Groepen zijn apparte VCards</item>
+    <item>Groepen zijn per-contact categories</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
+  <string name="settings_sync_time_range_past">Tijdslimiet verleden afspraken</string>
+  <string name="settings_sync_time_range_past_none">Alle afspraken worden gesynchronizeerd</string>
+  <plurals name="settings_sync_time_range_past_days">
+    <item quantity="one">Afspraken ouder dan een dag worden genegeerd</item>
+    <item quantity="other">Afspraken ouder dan %d dagen worden genegeerd</item>
+  </plurals>
+  <string name="settings_sync_time_range_past_message">Afspraken ouder dan dit aantal dagen worden genegeerd (mag 0 zijn). Laat leeg om alle afspraken te synchronizeren.</string>
+  <string name="settings_manage_calendar_colors">Agenda kleuren beheren</string>
+  <string name="settings_manage_calendar_colors_on">Agenda kleuren worden door DAVdroid beheerd.</string>
+  <string name="settings_manage_calendar_colors_off">Agenda kleuren worden niet door DAVdroid ingesteld</string>
+  <string name="settings_version_update">DAVdroid versie update</string>
+  <string name="settings_version_update_settings_updated">Interne instellingen zijn bijgewerkt.</string>
+  <string name="settings_version_update_install_hint">Problemen? Deïnstalleer DAVdroid, daarna herinstalleren.</string>
+  <!--collection management-->
+  <string name="create_addressbook">Maak adresboek</string>
+  <string name="create_addressbook_display_name_hint">Mijn adresboek</string>
+  <string name="create_calendar">Maak CalDAV collectie</string>
+  <string name="create_calendar_display_name_hint">Mijn agenda</string>
+  <string name="create_calendar_time_zone">Tijdzone:</string>
+  <string name="create_calendar_type">Collectie type:</string>
+  <string name="create_calendar_type_only_events">Agenda (alleen afspraken)</string>
+  <string name="create_calendar_type_only_tasks">Takenlijst (alleen taken)</string>
+  <string name="create_calendar_type_events_and_tasks">Gecombineerd (afspraken en taken)</string>
+  <string name="create_collection_color">Stel een collectie kleur in</string>
+  <string name="create_collection_creating">Collectie aan het maken</string>
+  <string name="create_collection_display_name">Weergave naam (titel) van deze collectie:</string>
+  <string name="create_collection_display_name_required">Titel is vereist</string>
+  <string name="create_collection_description">Beschrijving (optioneel):</string>
+  <string name="create_collection_home_set">Begin map:</string>
+  <string name="create_collection_create">Maak</string>
+  <string name="delete_collection">Verwijder collectie</string>
+  <string name="delete_collection_confirm_title">Weet je het zeker?</string>
+  <string name="delete_collection_confirm_warning">Deze collectie (%s) en alle data zal verwijderd worden van de server.</string>
+  <string name="delete_collection_deleting_collection">Collectie aan het verwijderen</string>
+  <!--ExceptionInfoFragment-->
+  <string name="exception">Er is een fout opgetreden.</string>
+  <string name="exception_httpexception">Er is een HTTP fout opgetreden.</string>
+  <string name="exception_ioexception">Er is een I/O fout opgetreden.</string>
+  <string name="exception_show_details">Toon details</string>
+  <!--sync errors and DebugInfoActivity-->
+  <string name="debug_info_title">Debug informatie</string>
+  <string name="sync_error_permissions">DAVdroid rechten</string>
+  <string name="sync_error_permissions_text">Aanvullende rechten vereist</string>
+  <string name="sync_error_calendar">Agenda synchronisatie is mislukt (%s)</string>
+  <string name="sync_error_contacts">Adresboek synchronisatie is mislukt (%s)</string>
+  <string name="sync_error_tasks">Taak synchronisatie is mislukt (%s)</string>
+  <string name="sync_error">Fout tijdens %s</string>
+  <string name="sync_error_http_dav">Serverfout tijdens %s</string>
+  <string name="sync_error_local_storage">Database fout tijdens %s</string>
+  <string-array name="sync_error_phases">
+    <item>synchronisatie voorbereiden</item>
+    <item>querying mogelijkheden</item>
+    <item>verwerken van lokaal verwijderde data</item>
+    <item>voorberteiding maken/wijzigen data</item>
+    <item>uploaden maken/bewerken data</item>
+    <item>controleren syngronisatie voortgang</item>
+    <item>lijst lokale data</item>
+    <item>lijst remote data</item>
+    <item>vergelijken lokale/remote data</item>
+    <item>downloaden remote data</item>
+    <item>nabewerking</item>
+    <item>opslaan sync voortgang</item>
+  </string-array>
+  <string name="sync_error_unauthorized">Gebruikersnaam/wachtwoord onjuist</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: Verbinding beveiliging</string>
+  <string name="trust_certificate_unknown_certificate_found">Davdroid is benaderd door een onbekend certificaat. Vertrouwd u dit?</string>
+</resources>

app/src/davdroid/res/values-pl/strings.xml

@@ -0,0 +1,236 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!--common strings-->
+  <string name="app_name">DAVdroid</string>
+  <string name="help">Pomoc</string>
+  <string name="manage_accounts">Zadządzaj kontami</string>
+  <string name="please_wait">Proszę czekać</string>
+  <string name="send">Wyślij</string>
+  <!--startup dialogs-->
+  <string name="startup_battery_optimization">Optymalizacja baterii</string>
+  <string name="startup_battery_optimization_message">Android może wyłączyć/zmniejszyć synchronizacje DAVdroid po kilku dniach. Aby temu zapobiec należy wyłączyć optymalizację baterii.</string>
+  <string name="startup_battery_optimization_disable">Wyłącz dla DAVdroid</string>
+  <string name="startup_dont_show_again">Nie pokazuj ponownie</string>
+  <string name="startup_development_version">DAVdroid Preview Release</string>
+  <string name="startup_development_version_message">Jest to wersja rozwojowa DAVdroid. Należy pamiętać, że rzeczy mogą nie działać zgodnie z oczekiwaniami. Prosimy o konstruktywny informacje zwrotne, aby ulepszyć DAVdroid.</string>
+  <string name="startup_development_version_give_feedback">Przekaż opinię</string>
+  <string name="startup_donate">Informacje Open-Source</string>
+  <string name="startup_donate_message">Jesteśmy szczęśliwi, że używasz DAVdroid, który jest oprogramowaniem open-source (GPLv3). Ponieważ rozwijanie DAVdroid jest ciężką pracą i zajęło nam tysiące godzin pracy, prosimy o rozważenie darowizny.</string>
+  <string name="startup_donate_now">Pokaż stronę darowizny</string>
+  <string name="startup_donate_later">Może później</string>
+  <string name="startup_google_play_accounts_removed">Informacje o błędzie DRM Sklepu Play</string>
+  <string name="startup_google_play_accounts_removed_message">Pod pewnymi warunkami, DRM Sklepu Play może powodować, że wszystkie konta DAVdroid mogą zostać usunięte po uruchomieniu lub po uaktualnieniu DAVdroid. Jeśli jesteś dotknięty tym problemem (i tylko wtedy) należy zainstalować \"DAVdroid JB Obejście\" ze Sklepu Play.</string>
+  <string name="startup_google_play_accounts_removed_more_info">Więcej informacji</string>
+  <string name="startup_opentasks_not_installed">OpenTasks nie jest zainstalowany</string>
+  <string name="startup_opentasks_not_installed_message">Aplikacja Open Tasks nie jest dostępna, więc DAVdroid nie będzie mógł synchronizować listy zadań. </string>
+  <string name="startup_opentasks_reinstall_davdroid">Po zainstalowaniu OpenTasks konieczne jest PRZEINSTALOWANIE DAVdroid i ponowne dodanie twoich kont (błąd Androida).</string>
+  <string name="startup_opentasks_not_installed_install">Zainstaluj OpenTasks</string>
+  <!--AboutActivity-->
+  <string name="about_license_terms">Warunki licencji</string>
+  <string name="about_license_info_no_warranty">Ten program jest ABSOLUTNIE BEZ GWARANCJI. To jest wolne oprogramowanie i mile widziane jest dalsze rozpowszechnianie go pod pewnymi warunkami.</string>
+  <!--global settings-->
+  <string name="logging_davdroid_file_logging">Plik logów DAVdroid</string>
+  <string name="logging_to_external_storage">Logowanie do zewnątrznej pamięci: %s</string>
+  <string name="logging_to_external_storage_warning">Usuń logi tak szybko jak to możliwe!</string>
+  <string name="logging_couldnt_create_file">Nie można stworzyć zewnętrznego pliku logów: %s</string>
+  <string name="logging_no_external_storage">Zewnętrzna pamięci nie została naleziona</string>
+  <!--AccountsActivity-->
+  <string name="navigation_drawer_open">Otwórz menu nawigacji</string>
+  <string name="navigation_drawer_close">Zamknij menu nawigacji</string>
+  <string name="navigation_drawer_subtitle">Adapter synchronizacji CalDAV/CardDAV</string>
+  <string name="navigation_drawer_about">O DAVdroid / Licencja</string>
+  <string name="navigation_drawer_settings">Ustawienia</string>
+  <string name="navigation_drawer_news_updates">Nowości &amp; aktualizacje</string>
+  <string name="navigation_drawer_external_links">Zewnętrzne odnośniki</string>
+  <string name="navigation_drawer_website">Strona WWW</string>
+  <string name="navigation_drawer_faq">FQA</string>
+  <string name="navigation_drawer_forums">Społeczność</string>
+  <string name="navigation_drawer_donate">Dotacja</string>
+  <string name="account_list_empty">Witamy w DAVdroid!\n\nMożesz teraz dodać konto CalDAV/CardDAV.</string>
+  <!--DavService-->
+  <string name="dav_service_refresh_failed">Wykrycie serwisu nie powiodło się</string>
+  <string name="dav_service_refresh_couldnt_refresh">Nie można odświeżyć listy kolekcji</string>
+  <!--AppSettingsActivity-->
+  <string name="app_settings">Ustawienia</string>
+  <string name="app_settings_user_interface">Interfejs użytkownika</string>
+  <string name="app_settings_reset_hints">Zresetuj podpowiedzi</string>
+  <string name="app_settings_reset_hints_summary">Ponownie włącz wskazówki, które zostały usunięte wcześniej</string>
+  <string name="app_settings_reset_hints_success">Wszystkie wskazówki pojawią się ponownie</string>
+  <string name="app_settings_security">Bezpieczeństwo</string>
+  <string name="app_settings_distrust_system_certs">Usuń certyfikaty systemowe</string>
+  <string name="app_settings_distrust_system_certs_on">CA systemowe i użytkownika nie zostaną dodane</string>
+  <string name="app_settings_distrust_system_certs_off">CA systemowe i użytkownika zostaną dodane (zalecane)</string>
+  <string name="app_settings_reset_certificates">Zresetuj (nie)zaufane certyfikaty</string>
+  <string name="app_settings_reset_certificates_summary">Zresetuj wszystkie niestandardowe certyfikaty.</string>
+  <string name="app_settings_reset_certificates_success">Wszystkie niestandardowe certyfikaty zostały wyczyszczone</string>
+  <string name="app_settings_debug">Debugowanie</string>
+  <string name="app_settings_log_to_external_storage">Loguj to zewnętrznego pliku</string>
+  <string name="app_settings_log_to_external_storage_on">Logowanie do zewnętrznej pamięci (jeśli jest dostępna)</string>
+  <string name="app_settings_log_to_external_storage_off">Logowanie do zewnętrznego pliku jest niedostępne</string>
+  <string name="app_settings_show_debug_info">Pokaż informacje do debug\'owania</string>
+  <string name="app_settings_show_debug_info_details">Przeglądaj/udostępnij oprogramowanie i szczegóły konfiguracji </string>
+  <!--AccountActivity-->
+  <string name="account_synchronize_now">Synchronizuj teraz</string>
+  <string name="account_synchronizing_now">Synchronizcja w toku</string>
+  <string name="account_settings">Ustawienia konta</string>
+  <string name="account_delete">Usuń konto</string>
+  <string name="account_delete_confirmation_title">Naprawdę chcesz usunąć konto?</string>
+  <string name="account_delete_confirmation_text">Wszystkie lokalne kopie książek adresowych, kalendarzy i list zadań zostaną usunięte.</string>
+  <string name="account_refresh_address_book_list">Odśwież list książek adresowych</string>
+  <string name="account_create_new_address_book">Stwórz nową książkę adresową</string>
+  <string name="account_refresh_calendar_list">Odśwież liste kalendarzy</string>
+  <string name="account_create_new_calendar">Stwórz nowy kalendarz</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">Uprawnienia DAVdroid</string>
+  <string name="permissions_calendar">Uprawnienia kalendarza</string>
+  <string name="permissions_calendar_details">Aby synchronizować wydarzenia CalDav z lokalnymi kalendarzami, DAVdroid potrzebuje dostępu do twoich kalendarzy.</string>
+  <string name="permissions_calendar_request">Zezwól na uprawnienia kalendarza</string>
+  <string name="permissions_contacts">Uprawnienia kontaktów</string>
+  <string name="permissions_contacts_details">Aby synchronizować książki adresowe CardDAV z lokalnymi kontaktami, DAVdroid potrzebuje dostępu do twoich kontaktów.</string>
+  <string name="permissions_contacts_request">Zezwól na uprawnienia kontaktów</string>
+  <string name="permissions_opentasks">Uprawnienia OpenTasks</string>
+  <string name="permissions_opentasks_details">Aby synchronizować zadania CalDav z lokalnymi listami zadań, DAVdroid potrzebuje dostępu do OpenTasks.</string>
+  <string name="permissions_opentasks_request">Zezwól na uprawnienia OpenTasks</string>
+  <!--AddAccountActivity-->
+  <string name="login_title">Dodaj konto</string>
+  <string name="login_type_email">Logowanie za pomocą adresu e-mail</string>
+  <string name="login_email_address">Adres e-mail</string>
+  <string name="login_email_address_error">Wymanagny poprawny adres e-mail</string>
+  <string name="login_password">Hasło</string>
+  <string name="login_password_required">Wymagane hasło</string>
+  <string name="login_type_url">Logowanie za pomocą adresu URL i nazwy użytkownika</string>
+  <string name="login_url_must_be_http_or_https">URL musi zaczynać się z http(s)://</string>
+  <string name="login_url_host_name_required">Wymagana nazwa hosta</string>
+  <string name="login_user_name">Nazwa użytkownika</string>
+  <string name="login_user_name_required">Wymagana nazwa użtkonika</string>
+  <string name="login_base_url">Podstawowy URL</string>
+  <string name="login_login">Zaloguj</string>
+  <string name="login_back">Wróć</string>
+  <string name="login_create_account">Stwórz konto</string>
+  <string name="login_account_name">Nazwa konta</string>
+  <string name="login_account_name_info">Użyj swojego adresu e-mail jako nazwy konta, ponieważ Android będzie używał nazwy konta jako pola ORGANIZATOR dla wydarzeń, które stworzysz. Nie możesz posiadać dwóch kont o takiej samej nazwie.</string>
+  <string name="login_account_contact_group_method">Metoda grupowania kontaktów:</string>
+  <string name="login_account_name_required">Wymagana nazwa konta</string>
+  <string name="login_account_not_created">Konto nie mogło zostać stworzone</string>
+  <string name="login_configuration_detection">Wykrywanie konfiguracji</string>
+  <string name="login_querying_server">Proszę czekać, odpytywanie serwera...</string>
+  <string name="login_no_caldav_carddav">Nie można znaleźć usługi CalDAV lub CardDAV.</string>
+  <string name="login_view_logs">Pokaż logi</string>
+  <!--AccountSettingsActivity-->
+  <string name="settings_title">Ustawienia: %s</string>
+  <string name="settings_authentication">Uwierzytelnianie</string>
+  <string name="settings_username">Nazwa użytkownika</string>
+  <string name="settings_enter_username">Wpisz nazwe użytkownika:</string>
+  <string name="settings_password">Hasło</string>
+  <string name="settings_password_summary">Zaktualizuj hasło zgodnie z serwerem.</string>
+  <string name="settings_enter_password">Wpisz hasło:</string>
+  <string name="settings_sync">Synchronizacja</string>
+  <string name="settings_sync_interval_contacts">Okres synchronizacji kontktów</string>
+  <string name="settings_sync_summary_manually">Tylko ręcznie</string>
+  <string name="settings_sync_summary_periodically" tools:ignore="PluralsCandidate">Co %d minut oraz natychmiast przy zmianach lokalnych</string>
+  <string name="settings_sync_summary_not_available">Niedostępne</string>
+  <string name="settings_sync_interval_calendars">Okres synchronizacji kalendarzy</string>
+  <string name="settings_sync_interval_tasks">Okres synchronizacji list zadań</string>
+  <string-array name="settings_sync_interval_seconds">
+    <item>-1</item>
+    <item>300</item>
+    <item>600</item>
+    <item>900</item>
+    <item>3600</item>
+    <item>7200</item>
+    <item>14400</item>
+    <item>86400</item>
+  </string-array>
+  <string-array name="settings_sync_interval_names">
+    <item>Tylko ręcznie</item>
+    <item>Co 5 minut</item>
+    <item>Co 10 minut</item>
+    <item>Co 15 minut</item>
+    <item>Co godzinę</item>
+    <item>Co 2 godziny</item>
+    <item>Co 4 godziny</item>
+    <item>Raz dziennie</item>
+  </string-array>
+  <string name="settings_sync_wifi_only">Synchronizuj tylko przez WiFi</string>
+  <string name="settings_sync_wifi_only_on">Synchronizacja jest ograniczony do połączeń WiFi</string>
+  <string name="settings_sync_wifi_only_off">Rodzaj połączenia nie jest brany pod uwagę</string>
+  <string name="settings_sync_wifi_only_ssid">Organicznie WiFi SSID</string>
+  <string name="settings_sync_wifi_only_ssid_on">Będzie synchronizować tylko przez %s.</string>
+  <string name="settings_sync_wifi_only_ssid_off">Wszystkie połączenia WiFi mogą zostać wykorzystane</string>
+  <string name="settings_sync_wifi_only_ssid_message">Wprowadź nazwę sieci WiFi (SSID), aby ograniczyć synchronizację do tej sieci lub pozostaw puste dla wszystkich połączeń WiFi.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">Metoda grupowania kontaktów</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
+  <string name="settings_sync_time_range_past">Limit czasowy przeszłych wydarzeń</string>
+  <string name="settings_sync_time_range_past_none">Wszystkie wydarzenia zostaną synchronizowane</string>
+  <plurals name="settings_sync_time_range_past_days">
+    <item quantity="one">Wydarzenia starsze niż jeden dzień zostaną zignorowane.</item>
+    <item quantity="few">Wydarzenia starsze niż %d dni zostaną zignorowane.</item>
+    <item quantity="other">Wydarzenia starsze niż %d dni zostaną zignorowane.</item>
+  </plurals>
+  <string name="settings_sync_time_range_past_message">Wydarzenia, które są starsze niż podana liczba dni zostaną zignorowane (może być 0). Zostaw puste, aby synchronizować wszystkie wydarzenia.</string>
+  <string name="settings_manage_calendar_colors">Zarządzaj kolorami kalendarza</string>
+  <string name="settings_manage_calendar_colors_on">Kolory kalendarza są zarządzane przez DAVdroid</string>
+  <string name="settings_manage_calendar_colors_off">Kolory kalendarze nie są ustawiane przez DAVdroid</string>
+  <string name="settings_version_update">Aktualizacji wersji DAVdroid</string>
+  <string name="settings_version_update_settings_updated">Ustawienia wewnętrzne zostały zaktualizowane.</string>
+  <string name="settings_version_update_install_hint">Problemy? Odinstaluj DAVdroid i zainstaluj ponownie.</string>
+  <!--collection management-->
+  <string name="create_addressbook">Stwórz książkę adresową</string>
+  <string name="create_addressbook_display_name_hint">Moja książka adresowa</string>
+  <string name="create_calendar">Stwórz kolekcje CalDAV</string>
+  <string name="create_calendar_display_name_hint">Mój kalendarz</string>
+  <string name="create_calendar_time_zone">Strefa czasowa:</string>
+  <string name="create_calendar_type">Typ kolekcji:</string>
+  <string name="create_calendar_type_only_events">Kalendarz (tylko wydarzenia)</string>
+  <string name="create_calendar_type_only_tasks">Lista zadań (tylko zadań)</string>
+  <string name="create_calendar_type_events_and_tasks">Połączone (wydarzenia i zadania)</string>
+  <string name="create_collection_color">Ustaw kolor kolekcji</string>
+  <string name="create_collection_creating">Tworzenie kolekcji</string>
+  <string name="create_collection_display_name">Nazwa wyświetlana (tytuł) kolekcji:</string>
+  <string name="create_collection_display_name_required">Tytuł jest wymagany</string>
+  <string name="create_collection_description">Opis (opcjoalnie)</string>
+  <string name="create_collection_home_set">Ustaw początek:</string>
+  <string name="create_collection_create">Stwórz</string>
+  <string name="delete_collection">Usuń kolekcje</string>
+  <string name="delete_collection_confirm_title">Jesteś pewien?</string>
+  <string name="delete_collection_confirm_warning">Kolekcja (%s) i jej wszystkie dane zostaną usunięte z serwera.</string>
+  <string name="delete_collection_deleting_collection">Usuwanie kolekcji</string>
+  <!--ExceptionInfoFragment-->
+  <string name="exception">Wystąpił błąd.</string>
+  <string name="exception_httpexception">Wystąpił błąd HTTP.</string>
+  <string name="exception_ioexception">Wystąpił błąd I/O.</string>
+  <string name="exception_show_details">Pokaż szczegóły</string>
+  <!--sync errors and DebugInfoActivity-->
+  <string name="debug_info_title">Informacje debugowe</string>
+  <string name="sync_error_permissions">Uprawnienia DAVdroid</string>
+  <string name="sync_error_permissions_text">Wymagane dodatkowe uprawnienia</string>
+  <string name="sync_error_calendar">Synchronizacja kalendarza nie powiodała się (%s)</string>
+  <string name="sync_error_contacts">Synchronizacja książki adresowej nie powiodała się (%s)</string>
+  <string name="sync_error_tasks">Synchronizacja zadań nie powiodała się (%s)</string>
+  <string name="sync_error">Błąd podczas %s</string>
+  <string name="sync_error_http_dav">Błąd servera podczas %s</string>
+  <string name="sync_error_local_storage">Bład bazy danych podczas %s</string>
+  <string-array name="sync_error_phases">
+    <item>przygotowanie synchronizacji</item>
+    <item>odpytywanie możliwości</item>
+    <item>przetwarzanie lokalnie usuniętych wpisów</item>
+    <item>przygotowanie stworzonych/zmodyfikowanych wpisów</item>
+    <item>wysyłanie stworzonych/zmodyfikowanych wpisów</item>
+    <item>sprawdzanie stanu synchronizacji</item>
+    <item>listowanie lokalnych wpisów</item>
+    <item>listowanie zdalnych wpisów</item>
+    <item>porównywanie lokalnych/zdalnych wpisów</item>
+    <item>pobieranie zdalnych wpisów</item>
+    <item>przetwarzanie końcowe</item>
+    <item>zapisywanie stanu synchronizacji</item>
+  </string-array>
+  <string name="sync_error_unauthorized">Błędna nazwa użytkownika lub hasło</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: Bezpieczeństwo połączenia</string>
+  <string name="trust_certificate_unknown_certificate_found">DAVdroid napotkał nieznany certyfikat. Czy chcesz go dodać?</string>
+</resources>

app/src/davdroid/res/values-pt-rBR/strings.xml

@@ -7,19 +7,23 @@
   <string name="please_wait">Por favor, aguarde...</string>
   <string name="send">Enviar</string>
   <!--startup dialogs-->
+  <string name="startup_battery_optimization">Otimização da bateria</string>
+  <string name="startup_battery_optimization_message">O Android pode desativar/reduzir a sincronização do DAVdroid depois de alguns dias. Para evitar isso, desligue a otimização da bateria.</string>
+  <string name="startup_battery_optimization_disable">Desligar para o DAVdroid</string>
   <string name="startup_dont_show_again">Não mostrar novamente</string>
   <string name="startup_development_version">Versão prévia do DAVdroid</string>
-  <string name="startup_development_version_message">Esta é uma versão de desenvolvimento do DAVdroid. Esteja ciente de que as coisas podem não funcionar como esperado. Por favor, envie sugestões e comentários construtivos para melhorar o DAVdroid.</string>
+  <string name="startup_development_version_message">Esta é uma versão de desenvolvimento do DAVdroid. Lembre-se de que as coisas podem não funcionar como esperado. Por favor, envie sugestões e comentários construtivos para melhorar o DAVdroid.</string>
   <string name="startup_development_version_give_feedback">Enviar sugestões</string>
-  <string name="startup_donate">Informações sobre Código Aberto</string>
-  <string name="startup_donate_message">Estamos felizes que você usa o DAVdroid, que é um software de código aberto (GPLv3). O desenvolvimento do DAVdroid é trabalhoso e nos consome muitas horas de trabalho. Por esse motivo, considere fazer uma doação.</string>
+  <string name="startup_donate">Informação sobre Código Aberto</string>
+  <string name="startup_donate_message">Estamos felizes que você usa o DAVdroid, um software de código aberto (GPLv3). O desenvolvimento do DAVdroid é trabalhoso e consome muitas horas de trabalho. Por esse motivo, considere fazer uma doação.</string>
   <string name="startup_donate_now">Mostrar a página de doações</string>
   <string name="startup_donate_later">Talvez depois</string>
   <string name="startup_google_play_accounts_removed">Informação sobre o erro de DRM da Play Store</string>
   <string name="startup_google_play_accounts_removed_message">Sob certas condições, o DRM da Play Store pode fazer com que todas as contas DAVdroid sejam perdidas depois de uma reinicialização ou atualização do DAVdroid. Se você for afetado por esse problema, instale o \"DAVdroid JB Workaround\" a partir da Play Store.</string>
   <string name="startup_google_play_accounts_removed_more_info">Mais informações</string>
   <string name="startup_opentasks_not_installed">O OpenTasks não está instalado</string>
-  <string name="startup_opentasks_not_installed_message">O aplicativo OpenTasks não está instalado ou está inacessível, não sendo possível sincronizar suas listas de tarefas com o DAVdroid. Reinstale o DAVdroid e então adicione suas contas novamente depois da instalação do OpenTasks.</string>
+  <string name="startup_opentasks_not_installed_message">O aplicativo OpenTasks não está disponível, não sendo possível sincronizar as listas de tarefas pelo DAVdroid.</string>
+  <string name="startup_opentasks_reinstall_davdroid">Depois da instalação do OpenTasks, torna-se necessário REINSTALAR o DAVdroid e adicionar suas contas novamente (erro do Android).</string>
   <string name="startup_opentasks_not_installed_install">Instalar o OpenTasks</string>
   <!--AboutActivity-->
   <string name="about_license_terms">Termos da Licença</string>
@@ -33,7 +37,7 @@
   <!--AccountsActivity-->
   <string name="navigation_drawer_open">Abrir a gaveta de navegação</string>
   <string name="navigation_drawer_close">Fechar gaveta de navegação</string>
-  <string name="navigation_drawer_subtitle">Adaptador de sincronização CalDAV/CardDAV</string>
+  <string name="navigation_drawer_subtitle">Sincronização de CalDAV/CardDAV</string>
   <string name="navigation_drawer_about">Sobre / Licença</string>
   <string name="navigation_drawer_settings">Configurações</string>
   <string name="navigation_drawer_news_updates">Novidades e atualizações</string>
@@ -51,31 +55,48 @@
   <string name="app_settings_user_interface">Interface de usuário</string>
   <string name="app_settings_reset_hints">Restaurar sugestões</string>
   <string name="app_settings_reset_hints_summary">Restaura as sugestões que foram descartadas anteriormente</string>
-  <string name="app_settings_reset_hints_success">Todas as sugestões serão apresentadas novamente</string>
+  <string name="app_settings_reset_hints_success">Todas as sugestões serão exibidas novamente</string>
+  <string name="app_settings_connection">Conexão</string>
+  <string name="app_settings_override_proxy">Substituir as configurações de proxy</string>
+  <string name="app_settings_override_proxy_on">Usar configurações de proxy personalizadas</string>
+  <string name="app_settings_override_proxy_off">Usar configurações de proxy padrão do sistema</string>
+  <string name="app_settings_override_proxy_host">Nome do servidor proxy HTTP</string>
+  <string name="app_settings_override_proxy_port">Porta do proxy HTTP</string>
   <string name="app_settings_security">Segurança</string>
-  <string name="app_settings_reset_trusted_certificates">Restaurar os certificados confiáveis</string>
-  <string name="app_settings_reset_trusted_certificates_summary">Esquece de todos os certificados que foram aceitos anteirormente</string>
-  <plurals name="app_settings_reset_trusted_certificates_success">
-    <item quantity="one">Retirada a confiança de um certificado</item>
-    <item quantity="other">Retirada a confiança de %d certificados</item>
-  </plurals>
+  <string name="app_settings_distrust_system_certs">Desconfiar dos certificados de sistema</string>
+  <string name="app_settings_distrust_system_certs_on">ACs adicionadas pelo usuário e pelo sistema não serão confiáveis</string>
+  <string name="app_settings_distrust_system_certs_off">ACs adicionadas pelo usuário e pelo sistema serão confiáveis (recomendado)</string>
+  <string name="app_settings_reset_certificates">Restaurar certificados não-confiáveis</string>
+  <string name="app_settings_reset_certificates_summary">Restaura a confiança de todos os certificados personalizados</string>
+  <string name="app_settings_reset_certificates_success">Todos os certificados personalizados foram restaurados</string>
   <string name="app_settings_debug">Depuração</string>
   <string name="app_settings_log_to_external_storage">Registrar em arquivo externo</string>
   <string name="app_settings_log_to_external_storage_on">Registrando no armazenamento externo (se disponível)</string>
   <string name="app_settings_log_to_external_storage_off">O registro em arquivo externo está desativado</string>
   <string name="app_settings_show_debug_info">Mostrar informações de depuração</string>
-  <string name="app_settings_show_debug_info_details">Exibir/compartilhar o software e os detalhes da configuração</string>
+  <string name="app_settings_show_debug_info_details">Exibe/compartilha o software e os detalhes da configuração</string>
   <!--AccountActivity-->
   <string name="account_synchronize_now">Sincronizar agora</string>
-  <string name="account_synchronizing_now">Sincronizando agora</string>
+  <string name="account_synchronizing_now">Sincronizando</string>
   <string name="account_settings">Configurações da conta</string>
   <string name="account_delete">Excluir conta</string>
-  <string name="account_delete_confirmation_title">Deseja realmente excluir a conta?</string>
+  <string name="account_delete_confirmation_title">Deseja excluir a conta?</string>
   <string name="account_delete_confirmation_text">Todas as cópias locais dos livros de endereços, calendários e listas de tarefas serão excluídas.</string>
   <string name="account_refresh_address_book_list">Atualizar lista de livros de endereços</string>
   <string name="account_create_new_address_book">Criar novo livro de endereços</string>
   <string name="account_refresh_calendar_list">Atualizar lista de calendários</string>
   <string name="account_create_new_calendar">Criar novo calendário</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">Permissões do DAVdroid</string>
+  <string name="permissions_calendar">Permissões do calendário</string>
+  <string name="permissions_calendar_details">Para sincronizar os eventos CalDAV com seus calendários locais, o DAVdroid precisa acessar seus calendários.</string>
+  <string name="permissions_calendar_request">Solicitar permissão do calendário</string>
+  <string name="permissions_contacts">Permissões dos contados</string>
+  <string name="permissions_contacts_details">Para sincronizar livros de endereços CardDAV com seus contatos locais, o DAVdroid precisa acessar seus contatos.</string>
+  <string name="permissions_contacts_request">Solicitar permissão dos contatos</string>
+  <string name="permissions_opentasks">Permissões do OpenTasks</string>
+  <string name="permissions_opentasks_details">Para sincronizar tarefas CalDAV com suas listas de tarefas locais, o DAVdroid precisa acessar o OpenTasks.</string>
+  <string name="permissions_opentasks_request">Solicitar permissão do OpenTasks</string>
   <!--AddAccountActivity-->
   <string name="login_title">Adicionar conta</string>
   <string name="login_type_email">Autenticação com endereço de e-mail</string>
@@ -89,12 +110,12 @@
   <string name="login_user_name">Usuário</string>
   <string name="login_user_name_required">É necessário um nome de usuário</string>
   <string name="login_base_url">URL base</string>
-  <string name="login_auth_preemptive">Autenticação preferencial (recomendado, mas incompatível com autenticação Digest)</string>
   <string name="login_login">Autenticar</string>
   <string name="login_back">Voltar</string>
   <string name="login_create_account">Criar conta</string>
   <string name="login_account_name">Nome da conta</string>
   <string name="login_account_name_info">Use seu endereço de e-mail como nome da conta porque o Android irá usar esse nome como campo AGENDA nos eventos que você criar. Não é possível ter duas contas com o mesmo nome.</string>
+  <string name="login_account_contact_group_method">Método do grupo Contato:</string>
   <string name="login_account_name_required">É necessário um nome de conta</string>
   <string name="login_account_not_created">A conta não pôde ser criada</string>
   <string name="login_configuration_detection">Detecção de configuração</string>
@@ -107,18 +128,15 @@
   <string name="settings_username">Nome do usuário</string>
   <string name="settings_enter_username">Digite o nome do usuário:</string>
   <string name="settings_password">Senha</string>
-  <string name="settings_password_summary">Atualize a senha de acordo com seu servidor.</string>
+  <string name="settings_password_summary">Atualize a senha de acordo com seu servidor</string>
   <string name="settings_enter_password">Digite sua senha:</string>
-  <string name="settings_preemptive">Autenticação preferencial</string>
-  <string name="settings_preemptive_on">Credenciais enviadas em cada requisição (recomendado)</string>
-  <string name="settings_preemptive_off">Credenciais enviadas após a requisição do servidor</string>
   <string name="settings_sync">Sincronização</string>
-  <string name="settings_sync_interval_contacts">Intervalo de sinc. de contatos</string>
+  <string name="settings_sync_interval_contacts">Intervalo sinc. de contatos</string>
   <string name="settings_sync_summary_manually">Apenas manualmente</string>
   <string name="settings_sync_summary_periodically" tools:ignore="PluralsCandidate">A cada %d minutos + imediatamente nas alterações locais</string>
   <string name="settings_sync_summary_not_available">Indisponível</string>
-  <string name="settings_sync_interval_calendars">Intervalo de sinc. de calendários</string>
-  <string name="settings_sync_interval_tasks">Intervalo de sinc. de tarefas</string>
+  <string name="settings_sync_interval_calendars">Intervalo sinc. de calendários</string>
+  <string name="settings_sync_interval_tasks">Intervalo sinc. de tarefas</string>
   <string-array name="settings_sync_interval_seconds">
     <item>-1</item>
     <item>300</item>
@@ -139,13 +157,34 @@
     <item>A cada 4 horas</item>
     <item>Uma vez por dia</item>
   </string-array>
-  <string name="settings_sync_time_range_past">Limite de tempo de eventos passados</string>
+  <string name="settings_sync_wifi_only">Sincronizar apenas por Wi-Fi</string>
+  <string name="settings_sync_wifi_only_on">Sincronização restrita a conexões Wi-Fi</string>
+  <string name="settings_sync_wifi_only_off">O tipo de conexão não é considerado</string>
+  <string name="settings_sync_wifi_only_ssid">Restrição de SSID Wi-Fi</string>
+  <string name="settings_sync_wifi_only_ssid_on">Sincronizará apenas com %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Qualquer conexão Wi-Fi pode ser utilizada</string>
+  <string name="settings_sync_wifi_only_ssid_message">Informe o nome da rede Wi-Fi (SSID) que será usada para sincronização ou deixe em branco para usar qualquer conexão Wi-Fi.</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">Método do grupo Contato</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>Grupos são VCards separados</item>
+    <item>Grupos são categorias por contato</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
+  <string name="settings_sync_time_range_past">Limite de tempo para eventos passados</string>
   <string name="settings_sync_time_range_past_none">Todos os eventos serão sincronizados</string>
   <plurals name="settings_sync_time_range_past_days">
     <item quantity="one">Os eventos que ocorreram a mais de um dia serão ignorados</item>
-    <item quantity="other">Os eventos que ocorreram a mais de %d dias serão ignorados</item>
+    <item quantity="other">Eventos que ocorreram a mais de %d dias serão ignorados</item>
   </plurals>
-  <string name="settings_sync_time_range_past_message">Os eventos que já ocorreram a mais tempo que esse número de dias serão ignorados (pode ser 0). Deixe em branco para sincronizar todos os eventos.</string>
+  <string name="settings_sync_time_range_past_message">Os eventos que ocorreram antes desse número de dias serão ignorados (pode ser 0). Deixe em branco para sincronizar todos os eventos.</string>
+  <string name="settings_manage_calendar_colors">Gerenciar cores dos calendários</string>
+  <string name="settings_manage_calendar_colors_on">Cores dos calendários definidas pelo DAVdroid</string>
+  <string name="settings_manage_calendar_colors_off">Cores dos calendários não definidas pelo DAVdroid</string>
   <string name="settings_version_update">Atualização da versão do DAVdroid</string>
   <string name="settings_version_update_settings_updated">As configurações internas foram atualizadas.</string>
   <string name="settings_version_update_install_hint">Problemas? Desinstale o DAVdroid e instale novamente.</string>
@@ -164,7 +203,7 @@
   <string name="create_collection_display_name">Mostrar o nome (título) desta coleção:</string>
   <string name="create_collection_display_name_required">É necessário um título</string>
   <string name="create_collection_description">Descrição (opcional):</string>
-  <string name="create_collection_home_set">Defina o endereço:</string>
+  <string name="create_collection_home_set">Indique o endereço:</string>
   <string name="create_collection_create">Criar</string>
   <string name="delete_collection">Excluir coleção</string>
   <string name="delete_collection_confirm_title">Tem certeza?</string>
@@ -177,6 +216,8 @@
   <string name="exception_show_details">Mostrar detalhes</string>
   <!--sync errors and DebugInfoActivity-->
   <string name="debug_info_title">Informações de depuração</string>
+  <string name="sync_error_permissions">Permissões do DAVdroid</string>
+  <string name="sync_error_permissions_text">É necessário permissões adicionais</string>
   <string name="sync_error_calendar">Falha na sincronização do calendário (%s)</string>
   <string name="sync_error_contacts">Falha na sincronização do livro de endereços (%s)</string>
   <string name="sync_error_tasks">Falha na sincronização das tarefas (%s)</string>
@@ -185,7 +226,7 @@
   <string name="sync_error_local_storage">Erro do banco de dados ao %s</string>
   <string-array name="sync_error_phases">
     <item>preparando sincronização</item>
-    <item>procurando capacidades</item>
+    <item>procurando habilidades</item>
     <item>processando os itens excluídos localmente</item>
     <item>preparando os itens criados/modificados</item>
     <item>enviando os itens criados/modificados</item>
@@ -194,7 +235,11 @@
     <item>listando os itens remotos</item>
     <item>comparando os itens locais/remotos</item>
     <item>baixando os itens remotos</item>
+    <item>pós-processamento</item>
     <item>salvando o estado da sincronização</item>
   </string-array>
   <string name="sync_error_unauthorized">Usuário/senha incorreto</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: Segurança da conexão</string>
+  <string name="trust_certificate_unknown_certificate_found">O DAVdroid encontrou um certificado desconhecido. Deseja torná-lo confiável?</string>
 </resources>

app/src/davdroid/res/values-pt/strings.xml

@@ -10,10 +10,10 @@
   <!--DavService-->
   <!--AppSettingsActivity-->
   <!--AccountActivity-->
+  <!--PermissionsActivity-->
   <!--AddAccountActivity-->
   <string name="login_type_email">Login com seu enderço de email</string>
   <string name="login_type_url">Login com URL e nome do usuário</string>
-  <string name="login_auth_preemptive">Autenticação preferida (recomendado, mas incompatível com Digest)</string>
   <!--AccountSettingsActivity-->
   <string name="settings_authentication">Autenticação</string>
   <string name="settings_username">Nome de usuário</string>
@@ -21,9 +21,6 @@
   <string name="settings_password">Senha</string>
   <string name="settings_password_summary">Atualize sua denha de acordo com a do seu servidor.</string>
   <string name="settings_enter_password">Informe sua senha:</string>
-  <string name="settings_preemptive">Pre-emptive authentication</string>
-  <string name="settings_preemptive_on">Credenciais são enviadas com cadas requisição (recomendado)</string>
-  <string name="settings_preemptive_off">Credenciais são enviadas apos o servidor requisitar</string>
   <string name="settings_sync">Sincronização</string>
   <string name="settings_sync_interval_contacts">Intervalo de sincronização dos contatos</string>
   <string name="settings_sync_summary_manually">Manualmente apenas</string>
@@ -53,4 +50,5 @@
   <!--collection management-->
   <!--ExceptionInfoFragment-->
   <!--sync errors and DebugInfoActivity-->
+  <!--cert4android-->
 </resources>

app/src/davdroid/res/values-ru/strings.xml

@@ -11,10 +11,10 @@
   <!--DavService-->
   <!--AppSettingsActivity-->
   <!--AccountActivity-->
+  <!--PermissionsActivity-->
   <!--AddAccountActivity-->
   <string name="login_type_email">Вход по адресу email</string>
-  <string name="login_type_url">Вход через URL  и имя пользователя</string>
-  <string name="login_auth_preemptive">Упреждающая идентификация (рекомендовано, но несовместимо с Digest идентификацией)</string>
+  <string name="login_type_url">Вход через URL и имя пользователя</string>
   <!--AccountSettingsActivity-->
   <string name="settings_authentication">Идентификация</string>
   <string name="settings_username">Имя</string>
@@ -22,9 +22,6 @@
   <string name="settings_password">Пароль</string>
   <string name="settings_password_summary">Обновить пароль в соответствии с вашим сервером.</string>
   <string name="settings_enter_password">Введите свой пароль:</string>
-  <string name="settings_preemptive">Упреждающая идентификация</string>
-  <string name="settings_preemptive_on">Учетные данные посылаются с каждым запросом (рекомендовано)</string>
-  <string name="settings_preemptive_off">Учетные данные посылаются после их запроса сервером</string>
   <string name="settings_sync">Синхронизация</string>
   <string name="settings_sync_interval_contacts">Интервал синхронизации контактов</string>
   <string name="settings_sync_summary_manually">Вручную</string>
@@ -63,4 +60,5 @@
   <string name="sync_error_http_dav">Ошибка сервера %s</string>
   <string name="sync_error_local_storage">Ошибка базы данных в процессе %s</string>
   <string name="sync_error_unauthorized">Имя пользователя/пароль неверные</string>
+  <!--cert4android-->
 </resources>

app/src/davdroid/res/values-sr/strings.xml

@@ -7,6 +7,9 @@
   <string name="please_wait">Сачекајте…</string>
   <string name="send">Пошаљи</string>
   <!--startup dialogs-->
+  <string name="startup_battery_optimization">Оптимизација батерије</string>
+  <string name="startup_battery_optimization_message">Андроид може да искључи/умањи синхронизацију ДАВдроида након неколико дана. Да бисте спречили ово, искључите оптимизацију батерије.</string>
+  <string name="startup_battery_optimization_disable">Искључи за ДАВдроид</string>
   <string name="startup_dont_show_again">Не приказуј поново</string>
   <string name="startup_development_version">ДАВдроид прелиминарно издање</string>
   <string name="startup_development_version_message">Ово је развојно издање ДАВдроида. Имајте на уму да можда неће радити очекивано. Замољавамо вас за конструктивне повратне информације како бисмо га побољшали.</string>
@@ -19,9 +22,12 @@
   <string name="startup_google_play_accounts_removed_message">Под одређеним околностима ДРМ Плеј продавнице може да узрокује да сви налози ДАВдроида нестане након рестарта или ажурирања ДАВдроида. Ако и само ако имате овај проблем, инсталирајте „DAVdroid JB Workaround“ са Плеј продавнице.</string>
   <string name="startup_google_play_accounts_removed_more_info">Још информација</string>
   <string name="startup_opentasks_not_installed">Отворени задаци нису инсталирани</string>
-  <string name="startup_opentasks_not_installed_message">Отворени задаци нису инсталирани или доступни, па ДАВдроид неће моћи да синхронизује листе задатака. Поново инсталирајте ДАВдроид и поново додајте ваше налоге након инсталације Отворених задатака.</string>
+  <string name="startup_opentasks_not_installed_message">Отворени задаци нису доступни па ДАВдроид неће моћи да синхронизује листе задатака. </string>
+  <string name="startup_opentasks_reinstall_davdroid">Након инсталирања Отворених задатака, морате поново да инсталирате ДАВдроид и поново додате ваше налоге (због грешке у Андроиду).</string>
   <string name="startup_opentasks_not_installed_install">Инсталирај Отворене задатке</string>
   <!--AboutActivity-->
+  <string name="about_license_terms">Услови лиценце</string>
+  <string name="about_license_info_no_warranty">Овај програм НЕМА НИКАКВЕ ГАРАНЦИЈЕ. Бесплатан је софтвер којег можете слободно да делите под одређеним условима.</string>
   <!--global settings-->
   <string name="logging_davdroid_file_logging">ДАВдроид евиденција</string>
   <string name="logging_to_external_storage">Уписивање евиденције у спољашње складиште: %s</string>
@@ -48,10 +54,27 @@
   <string name="app_settings">Поставке</string>
   <string name="app_settings_user_interface">Корисничко сучеље</string>
   <string name="app_settings_reset_hints">Ресетуј савете</string>
+  <string name="app_settings_reset_hints_summary">Поновно приказивање претходно одбачених савета</string>
   <string name="app_settings_reset_hints_success">Сви савети ће поново бити приказани</string>
+  <string name="app_settings_connection">Повезивање</string>
+  <string name="app_settings_override_proxy">Надјачај поставке проксија</string>
+  <string name="app_settings_override_proxy_on">Користи прилагођене поставке проксија</string>
+  <string name="app_settings_override_proxy_off">Користи системски подразумеване поставке проксија</string>
+  <string name="app_settings_override_proxy_host">ХТТП прокси домаћин</string>
+  <string name="app_settings_override_proxy_port">ХТТП прокси порт</string>
   <string name="app_settings_security">Безбедност</string>
-  <string name="app_settings_reset_trusted_certificates">Ресетуј поуздане сертификате</string>
+  <string name="app_settings_distrust_system_certs">Посумњај у системске сертификате</string>
+  <string name="app_settings_distrust_system_certs_on">Системски и кориснички додати сертификати неће бити поуздани</string>
+  <string name="app_settings_distrust_system_certs_off">Системски и кориснички додати сертификати ће бити поуздани (препоручљиво)</string>
+  <string name="app_settings_reset_certificates">Ресетуј (не)поуздане сертификате</string>
+  <string name="app_settings_reset_certificates_summary">Ресетуј поуздање свих прилагођених сертификата</string>
+  <string name="app_settings_reset_certificates_success">Сви прилагођени сертификати су уклоњени</string>
   <string name="app_settings_debug">Тражење грешака</string>
+  <string name="app_settings_log_to_external_storage">Уписуј у спољашњи фајл</string>
+  <string name="app_settings_log_to_external_storage_on">Уписивање евиденције у спољашње складиште (ако је доступно)</string>
+  <string name="app_settings_log_to_external_storage_off">Уписивање евиденције у спољашње складиште је искључено</string>
+  <string name="app_settings_show_debug_info">Прикажи податке за исправљање грешака</string>
+  <string name="app_settings_show_debug_info_details">Приказ/дељење детаља софтвера и поставки</string>
   <!--AccountActivity-->
   <string name="account_synchronize_now">Синхронизуј одмах</string>
   <string name="account_synchronizing_now">Синхронизујем</string>
@@ -63,6 +86,17 @@
   <string name="account_create_new_address_book">Направи нови адресар</string>
   <string name="account_refresh_calendar_list">Освежи списак календара</string>
   <string name="account_create_new_calendar">Направи нови календар</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">ДАВдроид дозволе</string>
+  <string name="permissions_calendar">Дозволе за календар</string>
+  <string name="permissions_calendar_details">Да би синхронизовао КалДАВ догађаје са вашим локалним календарима, ДАВдроиду треба приступ вашим календарима.</string>
+  <string name="permissions_calendar_request">Захтевај дозволе за календар</string>
+  <string name="permissions_contacts">Дозволе за контакте</string>
+  <string name="permissions_contacts_details">Да би синхронизовао КардДАВ адресаре са вашим локалним контактима, ДАВдроиду треба приступ вашим контактима.</string>
+  <string name="permissions_contacts_request">Захтевај дозволе за контакте</string>
+  <string name="permissions_opentasks">Дозволе за задатке</string>
+  <string name="permissions_opentasks_details">Да би синхронизовао КалДАВ задатке са вашим локалним листама задатака, ДАВдроиду треба приступ Задацима.</string>
+  <string name="permissions_opentasks_request">Захтевај дозволе за задатке</string>
   <!--AddAccountActivity-->
   <string name="login_title">Додај налог</string>
   <string name="login_type_email">Пријавите се адресом е-поште</string>
@@ -76,12 +110,12 @@
   <string name="login_user_name">Корисничко име</string>
   <string name="login_user_name_required">Корисничко име је обавезно</string>
   <string name="login_base_url">Корени УРЛ</string>
-  <string name="login_auth_preemptive">Превентивна аутентификација (препоручено, али некомпатибилно са Дигест аутентификацијом)</string>
   <string name="login_login">Пријава</string>
   <string name="login_back">Назад</string>
   <string name="login_create_account">Направи налог</string>
   <string name="login_account_name">Назив налога</string>
   <string name="login_account_name_info">Користите вашу е-адресу за назив налога јер Андроид користи назив налога за поље ОРГАНИЗАТОР за догађаје које направите. Не можете имати два налога истог назива.</string>
+  <string name="login_account_contact_group_method">Режим група контаката:</string>
   <string name="login_account_name_required">Назив налога је обавезан</string>
   <string name="login_account_not_created">Не могох направити налог</string>
   <string name="login_configuration_detection">Откривање конфигурације</string>
@@ -96,9 +130,6 @@
   <string name="settings_password">Лозинка</string>
   <string name="settings_password_summary">Ажурирајте лозинку за ваш сервер.</string>
   <string name="settings_enter_password">Унесите лозинку:</string>
-  <string name="settings_preemptive">Превентивна аутентификација</string>
-  <string name="settings_preemptive_on">Слање акредитива са сваким захтевом (препоручено)</string>
-  <string name="settings_preemptive_off">Слање акредитива по захтеву сервера</string>
   <string name="settings_sync">Синхронизација</string>
   <string name="settings_sync_interval_contacts">Интервал синх. контаката</string>
   <string name="settings_sync_summary_manually">Само ручно</string>
@@ -126,6 +157,35 @@
     <item>Свака 4 сата</item>
     <item>Једном дневно</item>
   </string-array>
+  <string name="settings_sync_wifi_only">Само преко бежичног</string>
+  <string name="settings_sync_wifi_only_on">Синхронизовање само преко бежичних мрежа</string>
+  <string name="settings_sync_wifi_only_off">Тип везе није узет у обзир</string>
+  <string name="settings_sync_wifi_only_ssid">Ограничења ССИД-а бежичних</string>
+  <string name="settings_sync_wifi_only_ssid_on">Синхронизовање само преко %s</string>
+  <string name="settings_sync_wifi_only_ssid_off">Коришћење свих бежичних мрежа</string>
+  <string name="settings_sync_wifi_only_ssid_message">Унесите назив бежичне мреже (њен ССИД) да бисте ограничили синхронизацију само на ту мрежу, или оставите празно за синхронизовање преко било које бежичне мреже.</string>
+  <string name="settings_carddav">КардДАВ</string>
+  <string name="settings_contact_group_method">Режим група контаката</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>Групе су одвојене В-карте</item>
+    <item>Групе су категорије по контакту</item>
+  </string-array>
+  <string name="settings_caldav">КалДАВ</string>
+  <string name="settings_sync_time_range_past">Ограничење догађаја у прошлости</string>
+  <string name="settings_sync_time_range_past_none">Сви догађаји се синхронизују</string>
+  <plurals name="settings_sync_time_range_past_days">
+    <item quantity="one">Догађаји старији од једног дана ће бити занемарени</item>
+    <item quantity="few">Догађаји старији од %d дана ће бити занемарени</item>
+    <item quantity="other">Догађаји старији од %d дана ће бити занемарени</item>
+  </plurals>
+  <string name="settings_sync_time_range_past_message">Догађаји старији од овог броја дана ће бити занемарени (може бити 0). Оставите празно за синхронизацију свих догађаја.</string>
+  <string name="settings_manage_calendar_colors">Управљај бојама календара</string>
+  <string name="settings_manage_calendar_colors_on">Бојама календара управља ДАВдроид</string>
+  <string name="settings_manage_calendar_colors_off">Боје календара није поставио ДАВдроид</string>
   <string name="settings_version_update">Надоградња ДАВдроид издања</string>
   <string name="settings_version_update_settings_updated">Унутрашње поставке су ажуриране.</string>
   <string name="settings_version_update_install_hint">Проблеми? Уклоните ДАВдроид па га поново инсталирајте.</string>
@@ -144,6 +204,7 @@
   <string name="create_collection_display_name">Назив (наслов) ове збирке:</string>
   <string name="create_collection_display_name_required">Наслов је обавезан</string>
   <string name="create_collection_description">Опис (необавезан):</string>
+  <string name="create_collection_home_set">Домаћа фасцикла:</string>
   <string name="create_collection_create">Направи</string>
   <string name="delete_collection">Обриши збирку</string>
   <string name="delete_collection_confirm_title">Да ли сте сигурни?</string>
@@ -156,6 +217,8 @@
   <string name="exception_show_details">Прикажи детаље</string>
   <!--sync errors and DebugInfoActivity-->
   <string name="debug_info_title">Подаци за исправљање грешака</string>
+  <string name="sync_error_permissions">ДАВдроид дозволе</string>
+  <string name="sync_error_permissions_text">Потребне су додатне доволе</string>
   <string name="sync_error_calendar">Синхронизација календара није успела (%s)</string>
   <string name="sync_error_contacts">Синхронизација адресара није успела (%s)</string>
   <string name="sync_error_tasks">Синхронизација задатака није успела (%s)</string>
@@ -163,17 +226,21 @@
   <string name="sync_error_http_dav">Грешка сервера током %s</string>
   <string name="sync_error_local_storage">Грешка базе података током %s</string>
   <string-array name="sync_error_phases">
-    <item>припреме синхронизације</item>
-    <item>упита за могућности</item>
-    <item>обраде локално обрисаних уноса</item>
-    <item>припреме направљених/измењених уноса</item>
-    <item>отпремања направљених/измењених уноса</item>
-    <item>провере стања синхронизације</item>
-    <item>излиставања локалних уноса</item>
-    <item>излиставања удаљених уноса</item>
-    <item>упоређивања локалних/удаљених уноса</item>
-    <item>преузимања удаљених уноса</item>
-    <item>уписа стања синхронизације</item>
+    <item>припремам синхронизацију</item>
+    <item>проверавам могућности</item>
+    <item>обрађујем локално обрисане уносе</item>
+    <item>припремам направљене/измењене уносе</item>
+    <item>отпремам направљене/измењене уносе</item>
+    <item>проверавам стање синхронизације</item>
+    <item>излиставам локалне уносе</item>
+    <item>излиставам удаљене уносе</item>
+    <item>упоређујем локалне/удаљене уносе</item>
+    <item>преузимам удаљене уносе</item>
+    <item>додатна обрада</item>
+    <item>уписујем стање синхронизације</item>
   </string-array>
   <string name="sync_error_unauthorized">Корисничко име или лозинка погрешни</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">ДАВдроид: Безбедност везе</string>
+  <string name="trust_certificate_unknown_certificate_found">ДАВдроид је наишао на непознат сертификат. Желите ли да се поуздате у њега?</string>
 </resources>

app/src/davdroid/res/values-tr-rTR/strings.xml

@@ -0,0 +1,204 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<resources xmlns:tools="http://schemas.android.com/tools">
+  <!--common strings-->
+  <string name="app_name">DAVdroid</string>
+  <string name="help">Yardım</string>
+  <string name="manage_accounts">Hesapları yönet</string>
+  <string name="please_wait">Lütfen bekle ...</string>
+  <string name="send">Gönder</string>
+  <!--startup dialogs-->
+  <string name="startup_dont_show_again">Bir daha gösterme</string>
+  <string name="startup_development_version">DAVDroid Önizlenim Dağıtımı</string>
+  <string name="startup_development_version_message">Bu DAVdroid\'in bir geliştirme sürümüdür. Bazı şeyler beklendiği gibi çalışmayabilir. DAVdroid\'i iyileştirmek için bize lütfen yapıcı eleştirilerini ilet.</string>
+  <string name="startup_development_version_give_feedback">Geribildirim ver</string>
+  <string name="startup_donate">Açık-Kaynak Bilgisi</string>
+  <string name="startup_donate_message">Açık kaynaklı yazılım (GPLv3) olan DAVdroid\'i kullandığına çok mutluyuz. DAVdroid\'i geliştirmek zor bir iş ve üzerinde binlerce saat çalıştığımızdan, lütfen bir bağışta bulunmayı düşün.</string>
+  <string name="startup_donate_now">Bağış sayfasını göster</string>
+  <string name="startup_donate_later">Belki sonra</string>
+  <string name="startup_google_play_accounts_removed">Play Store DRM hata bilgisi</string>
+  <string name="startup_google_play_accounts_removed_message">Bazı durumlarda Play Store DRM\'i, cihazı yeniden başlatınca veya DAVdroid\'i yükseltince DAVdroid hesaplarının yokolmasına sebep olabiliyor. Bu sorundan etkileniyorsan (ve sadece bu durumda), lütfen Play Store\'daki \"DAVdroid JB Workaround\" uygulamasını kur.</string>
+  <string name="startup_google_play_accounts_removed_more_info">Daha fazla bilgi</string>
+  <string name="startup_opentasks_not_installed">OpenTasks kurulu değil</string>
+  <string name="startup_opentasks_not_installed_message">OpenTasks uygulaması yok, dolayısıyla DAVdroid iş listelerini senkronize edemeyecektir.</string>
+  <string name="startup_opentasks_reinstall_davdroid">OpenTasks\'i kurduktan sonra, DAVdroid\'i YENİDEN KURMAN ve hesaplarını yeniden eklemen gerek. (Android hatası).</string>
+  <string name="startup_opentasks_not_installed_install">OpenTasks kur</string>
+  <!--AboutActivity-->
+  <string name="about_license_terms">Lisans şartları</string>
+  <string name="about_license_info_no_warranty">Bu uygulama HİÇ BİR GARANTİ ile gelmemektedir. Bedava bir yazılımdır ve belli koşullar altında dağıtabilirsiniz.</string>
+  <!--global settings-->
+  <string name="logging_davdroid_file_logging">DAVdroid dosya jurnallemesi</string>
+  <string name="logging_to_external_storage">Harici depolamaya jurnalleniyor: %s</string>
+  <string name="logging_to_external_storage_warning">Jurnalleri bir an önce silin!</string>
+  <string name="logging_couldnt_create_file">Harici jurnal dosyası yaratılamadı: %s </string>
+  <string name="logging_no_external_storage">Harici depolama alanı bulunamadı</string>
+  <!--AccountsActivity-->
+  <string name="navigation_drawer_open">Navigasyon çekmecesini aç</string>
+  <string name="navigation_drawer_close">Navigasyon çekmecesini kapat</string>
+  <string name="navigation_drawer_subtitle">CalDAV/CardDAV Senkronizasyon Adaptörü</string>
+  <string name="navigation_drawer_about">Hakkında / Lisans</string>
+  <string name="navigation_drawer_settings">Ayarlar</string>
+  <string name="navigation_drawer_news_updates">Haberler  &amp; güncellemeler </string>
+  <string name="navigation_drawer_external_links">Harici bağlantılar</string>
+  <string name="navigation_drawer_website">Web sitesi</string>
+  <string name="navigation_drawer_faq">SSS</string>
+  <string name="navigation_drawer_forums">Camia</string>
+  <string name="navigation_drawer_donate">Bağış yap</string>
+  <string name="account_list_empty">DAVdroid\'e hoşgeldin!\n\nŞimdi bir CalDAV/CardDAV hesabı ekleyebilirsin.</string>
+  <!--DavService-->
+  <string name="dav_service_refresh_failed">Servis keşfi başarısız</string>
+  <string name="dav_service_refresh_couldnt_refresh">Kolleksiyon listesi yenilenemedi</string>
+  <!--AppSettingsActivity-->
+  <string name="app_settings">Ayarlar</string>
+  <string name="app_settings_user_interface">Kullanıcı arayüzü</string>
+  <string name="app_settings_reset_hints">İpuçlarını sıfırla</string>
+  <string name="app_settings_reset_hints_summary">Daha önceden azat edilen ipuçlarını yeniden etkinleştirir</string>
+  <string name="app_settings_reset_hints_success">Tüm ipuçları artık gösterilecek</string>
+  <string name="app_settings_security">Güvenlik</string>
+  <string name="app_settings_debug">Hata ayıklama</string>
+  <string name="app_settings_log_to_external_storage">Harici dosyaya jurnalle</string>
+  <string name="app_settings_log_to_external_storage_on">Harici depolamaya jurnalleniyor (eğer uygunsa)</string>
+  <string name="app_settings_log_to_external_storage_off">Harici depolama mevcut değil</string>
+  <string name="app_settings_show_debug_info">Hata ayıklama bilgilerini göster</string>
+  <string name="app_settings_show_debug_info_details">Yazılım ve konfigürasyon detaylarına bak/paylaş</string>
+  <!--AccountActivity-->
+  <string name="account_synchronize_now">Şimdi senkronize et</string>
+  <string name="account_synchronizing_now">Senkronize ediyor</string>
+  <string name="account_settings">Hesap ayarları</string>
+  <string name="account_delete">Hesabı sil</string>
+  <string name="account_delete_confirmation_title">Hesap gerçekten silinsin mi?</string>
+  <string name="account_delete_confirmation_text">Rehber, takvim ve iş listelerinin tüm yerel kopyaları silinecektir.</string>
+  <string name="account_refresh_address_book_list">Rehber listesini yenile</string>
+  <string name="account_create_new_address_book">Yeni rehber oluştur</string>
+  <string name="account_refresh_calendar_list">Takvim listesini yenile</string>
+  <string name="account_create_new_calendar">Yeni takvim oluştur</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">DAVdroid izinleri</string>
+  <string name="permissions_calendar">Takvim izinleri</string>
+  <string name="permissions_calendar_details">Takvim (sadece olaylar)
+</string>
+  <string name="permissions_calendar_request">Takvim izinleri iste</string>
+  <string name="permissions_contacts">Kişiler izinleri</string>
+  <string name="permissions_contacts_details">CardDAV rehberlerinin cihazınızdaki kişilerinizle senkronize edebilmek için, DAVdroid cihazınızdaki kişilerinize erişime ihtiyacı vardır.</string>
+  <string name="permissions_contacts_request">Kişiler izinleri iste</string>
+  <string name="permissions_opentasks">OpenTasks izinleri</string>
+  <string name="permissions_opentasks_details">CalDav iş listelerinizi yerel iş listelerinizle senkronize edebilmek için DAVdroid\'in OpenTasks\'e erişime ihtiyacı vardır.</string>
+  <string name="permissions_opentasks_request">OpenTasks izinleri iste</string>
+  <!--AddAccountActivity-->
+  <string name="login_title">Hesap ekle</string>
+  <string name="login_type_email">Eposta adresi ile giriş yap</string>
+  <string name="login_email_address">Eposta adresi</string>
+  <string name="login_email_address_error">Geçerli eposta adresi zorunludur</string>
+  <string name="login_password">Parola</string>
+  <string name="login_password_required">Parola zorunludur</string>
+  <string name="login_type_url">URL ve kullanıcı adı ile giriş yap</string>
+  <string name="login_url_must_be_http_or_https">URL http(s):// ile başlamalıdır</string>
+  <string name="login_url_host_name_required">Sunucu adı zorunludur</string>
+  <string name="login_user_name">Kullanıcı adı</string>
+  <string name="login_user_name_required">Kullanıcı adı zorunludur</string>
+  <string name="login_base_url">Baz URL</string>
+  <string name="login_login">Giriş</string>
+  <string name="login_back">Geri</string>
+  <string name="login_create_account">Hesap yarat</string>
+  <string name="login_account_name">Hesap adı</string>
+  <string name="login_account_name_info">Hesap ismi olarak e-posta adresini kullan çünkü Android hesap ismini yarattığın olaylarda DÜZENLEYEN alanında kullanacaktır. Aynı isimde iki faklı hesabın olamaz.</string>
+  <string name="login_account_name_required">Hesap adı zorunludur</string>
+  <string name="login_account_not_created">Hesap yaratılamadı</string>
+  <string name="login_configuration_detection">Konfigürasyon keşfi</string>
+  <string name="login_querying_server">Lütfen bekle, sunucu sorgulanıyor...</string>
+  <string name="login_no_caldav_carddav">CalDAV veya CardDAV servisi bulunamadı.</string>
+  <string name="login_view_logs">Jurnallere bak</string>
+  <!--AccountSettingsActivity-->
+  <string name="settings_title">Ayarlar: %s</string>
+  <string name="settings_authentication">Doğrulama</string>
+  <string name="settings_username">Kullanıcı adı</string>
+  <string name="settings_enter_username">Kullanıcı adı girin:</string>
+  <string name="settings_password">Parola</string>
+  <string name="settings_password_summary">Parolayı sunucunuza göre güncelleyin.</string>
+  <string name="settings_enter_password">Parola girin:</string>
+  <string name="settings_sync">Senkronizasyon</string>
+  <string name="settings_sync_interval_contacts">Kişiler senk. aralığı</string>
+  <string name="settings_sync_summary_manually">Sadece elle</string>
+  <string name="settings_sync_summary_periodically" tools:ignore="PluralsCandidate">Her %d dakika + yerel değişikliklerde hemen</string>
+  <string name="settings_sync_summary_not_available">Mevcut değil</string>
+  <string name="settings_sync_interval_calendars">Takvimler senk. aralığı</string>
+  <string name="settings_sync_interval_tasks">İşler senk. aralığı</string>
+  <string-array name="settings_sync_interval_seconds">
+    <item>-1</item>
+    <item>300</item>
+    <item>600</item>
+    <item>900</item>
+    <item>3600</item>
+    <item>7200</item>
+    <item>14400</item>
+    <item>86400</item>
+  </string-array>
+  <string-array name="settings_sync_interval_names">
+    <item>Sadece elle</item>
+    <item>Her 5 dakikada bir</item>
+    <item>Her 10 dakikada bir</item>
+    <item>Her 15 dakikada bir</item>
+    <item>Her saatte bir</item>
+    <item>Her 2 saatte bir</item>
+    <item>Her 4 saatte bir</item>
+    <item>Günde bir</item>
+  </string-array>
+  <string name="settings_sync_wifi_only">Sadece WiFi üzerinden senkronize et</string>
+  <string name="settings_sync_wifi_only_on">Senkronizasyon WiFi bağlantıları ile kısıtlıdır</string>
+  <string name="settings_sync_wifi_only_off">Bağlantı tipi göz önünde bulundurulmaz</string>
+  <string name="settings_sync_wifi_only_ssid">WiFi SSID kısıtlaması</string>
+  <string name="settings_sync_wifi_only_ssid_on">Sadece %s üzerinden senkronize olur</string>
+  <string name="settings_sync_wifi_only_ssid_off">Tüm WiFi bağlantıları kullanılabilir</string>
+  <string name="settings_sync_wifi_only_ssid_message">Senkronizasyonu sadece bir WiFi ağına kısıtlamak için bu ağın adını (SSID) gir, veya tüm WiFi bağlantıları için boş bırak.</string>
+  <string name="settings_caldav">CalDAV</string>
+  <string name="settings_sync_time_range_past">Geçmiş olay zaman sınırı</string>
+  <string name="settings_sync_time_range_past_none">Tüm olaylar senkronize edilecek</string>
+  <plurals name="settings_sync_time_range_past_days">
+    <item quantity="other">%d günden daha eski olaylar göz ardı edilecektir</item>
+  </plurals>
+  <string name="settings_sync_time_range_past_message">Bu sayıdan daha eski olan olaylar yok sayılacaktır (0 olabilir). Tüm olayları senkronize etmek için boş bırak.</string>
+  <string name="settings_manage_calendar_colors">Takvim renklerini yönet</string>
+  <string name="settings_manage_calendar_colors_on">Takvim renkleri DAVdroid tarafından yönetilmekte</string>
+  <string name="settings_manage_calendar_colors_off">Takvim renkleri DAVdroid tarafından ayarlanmadı</string>
+  <string name="settings_version_update">DAVdroid sürüm güncellemesi</string>
+  <string name="settings_version_update_settings_updated">Dahili ayarlar güncellendi.</string>
+  <string name="settings_version_update_install_hint">Sorunlar mı var? DAVdroid\'i kaldırıp, yeniden kurun.</string>
+  <!--collection management-->
+  <string name="create_addressbook">Rehber yarat</string>
+  <string name="create_addressbook_display_name_hint">Benim Rehberim</string>
+  <string name="create_calendar">CalDav koleksiyonu yarat</string>
+  <string name="create_calendar_display_name_hint">Benim Takvimim</string>
+  <string name="create_calendar_time_zone">Saat dilimi:</string>
+  <string name="create_calendar_type">Koleksiyon Tipi:</string>
+  <string name="create_calendar_type_only_events">Takvim (sadece olaylar)</string>
+  <string name="create_calendar_type_only_tasks">İşler listesi (sadece işler)
+</string>
+  <string name="create_calendar_type_events_and_tasks">Birleşik (olaylar ve işler)</string>
+  <string name="create_collection_color">Bir koleksiyon rengi tanımla</string>
+  <string name="create_collection_creating">Koleksiyon yaratılıyor</string>
+  <string name="create_collection_display_name">Bu koleksiyonun gösterilen adı (başlığı):</string>
+  <string name="create_collection_display_name_required">Başlık zorunlu</string>
+  <string name="create_collection_description">Açıklama (isteğe bağlı):</string>
+  <string name="create_collection_home_set">Ev seti:</string>
+  <string name="create_collection_create">Yarat</string>
+  <string name="delete_collection">Koleksiyonu sil</string>
+  <string name="delete_collection_confirm_title">Emin misin?</string>
+  <string name="delete_collection_confirm_warning">Bu koleksiyon (%s) ve tüm verisi sunucudan silinecek.</string>
+  <string name="delete_collection_deleting_collection">Koleksiyon siliniyor</string>
+  <!--ExceptionInfoFragment-->
+  <string name="exception">Bir hata oluştu.</string>
+  <string name="exception_httpexception">Bir HTTP hatası oluştu.</string>
+  <string name="exception_ioexception">Bir I/O hatası oluştu.</string>
+  <string name="exception_show_details">Detayları göster</string>
+  <!--sync errors and DebugInfoActivity-->
+  <string name="debug_info_title">Hata ayıklama bilgisi</string>
+  <string name="sync_error_permissions">DAVdroid izinleri</string>
+  <string name="sync_error_permissions_text">Ek izinler zorunludur</string>
+  <string name="sync_error_calendar">Takvim senkronizasyonu başarısız (%s)</string>
+  <string name="sync_error_contacts">Rehber senkronizasyonu başarısız (%s)</string>
+  <string name="sync_error_tasks">İş senkronizasyonu başarısız (%s)</string>
+  <string name="sync_error">%s yaparken hata</string>
+  <string name="sync_error_http_dav">%s yaparken sunucu hatası</string>
+  <string name="sync_error_local_storage">%s yaparken veritabanı hatası</string>
+  <string name="sync_error_unauthorized">Kullanıcı adı/parola yanlış</string>
+  <!--cert4android-->
+</resources>

app/src/davdroid/res/values-uk/strings.xml

@@ -10,10 +10,10 @@
   <!--DavService-->
   <!--AppSettingsActivity-->
   <!--AccountActivity-->
+  <!--PermissionsActivity-->
   <!--AddAccountActivity-->
   <string name="login_type_email">Увійти за допомогою електронної пошти</string>
   <string name="login_type_url">Увійти за допомогою URL та імені користувача</string>
-  <string name="login_auth_preemptive">Випереджаюча автентифікація (рекомендовано, але несумісно із Digest auth)</string>
   <!--AccountSettingsActivity-->
   <string name="settings_authentication">Автентифікація</string>
   <string name="settings_username">Ім\'я користувача</string>
@@ -21,9 +21,6 @@
   <string name="settings_password">Пароль</string>
   <string name="settings_password_summary">Оновити пароль, згідно налаштувань Вашого сервера.</string>
   <string name="settings_enter_password">Введіть Ваш пароль:</string>
-  <string name="settings_preemptive">Випереджаюча автентифікація</string>
-  <string name="settings_preemptive_on">Дані автентифікації будуть надсилатися із кожним запитом (рекомендовано)</string>
-  <string name="settings_preemptive_off">Дані автентифікації будуть надіслані після відповідного запиту сервера</string>
   <string name="settings_sync">Синхронізація</string>
   <string name="settings_sync_interval_contacts">Інтервал синхронізації контактів</string>
   <string name="settings_sync_summary_manually">Лише вручну</string>
@@ -54,4 +51,5 @@
   <!--collection management-->
   <!--ExceptionInfoFragment-->
   <!--sync errors and DebugInfoActivity-->
+  <!--cert4android-->
 </resources>

app/src/davdroid/res/values-zh-rCN/strings.xml

@@ -7,6 +7,9 @@
   <string name="please_wait">请稍等...</string>
   <string name="send">发送</string>
   <!--startup dialogs-->
+  <string name="startup_battery_optimization">电池优化</string>
+  <string name="startup_battery_optimization_message">系统可能会在几天后减少或停用 DAVdroid 同步。为了避免这一情况，请对 DAVdroid 忽略电池优化。</string>
+  <string name="startup_battery_optimization_disable">忽略电池优化</string>
   <string name="startup_dont_show_again">不再显示</string>
   <string name="startup_development_version">DAVdroid 预览版</string>
   <string name="startup_development_version_message">这是 DAVdroid 的开发版本，部分功能可能无法正常工作。请您提出建设性反馈，帮助我们完善 DAVdroid。</string>
@@ -19,7 +22,8 @@
   <string name="startup_google_play_accounts_removed_message">在部分情况下，Play 商店的 DRM 可能会导致所有 DAVdroid 账户在设备重启或升级 DAVdroid 后消失。如果你遇到了该问题（并且只有这一问题），请从 Play 商店安装“DAVdroid JB Workaround”。</string>
   <string name="startup_google_play_accounts_removed_more_info">更多信息</string>
   <string name="startup_opentasks_not_installed">OpenTasks 未安装</string>
-  <string name="startup_opentasks_not_installed_message">OpenTasks 应用未安装或不可见，因此 DAVdroid 无法同步任务列表。请在安装 OpenTasks 后，重新安装 DAVdroid，再增加账户。</string>
+  <string name="startup_opentasks_not_installed_message">未安装 OpenTasks 应用，故 DAVdroid 无法同步任务列表。</string>
+  <string name="startup_opentasks_reinstall_davdroid">安装 OpenTasks 后，由于 Android 的限制，请重新安装 DAVdroid 并重新创建账户。</string>
   <string name="startup_opentasks_not_installed_install">安装 OpenTasks</string>
   <!--AboutActivity-->
   <string name="about_license_terms">许可协议</string>
@@ -53,11 +57,12 @@
   <string name="app_settings_reset_hints_summary">重新显示之前忽略过的提示</string>
   <string name="app_settings_reset_hints_success">所有提示将会再次显示</string>
   <string name="app_settings_security">安全</string>
-  <string name="app_settings_reset_trusted_certificates">重设受信任证书</string>
-  <string name="app_settings_reset_trusted_certificates_summary">取消信任所有之前接受的证书</string>
-  <plurals name="app_settings_reset_trusted_certificates_success">
-    <item quantity="other">已删除 %d 个证书</item>
-  </plurals>
+  <string name="app_settings_distrust_system_certs">不信任系统证书</string>
+  <string name="app_settings_distrust_system_certs_on">系统和用户增加的发布者不会被信任</string>
+  <string name="app_settings_distrust_system_certs_off">系统和用户增加的发布者会被信任（推荐）</string>
+  <string name="app_settings_reset_certificates">重设证书信任状态</string>
+  <string name="app_settings_reset_certificates_summary">重设所有自定义证书的信任状态</string>
+  <string name="app_settings_reset_certificates_success">所有自定义证书已清除</string>
   <string name="app_settings_debug">调试</string>
   <string name="app_settings_log_to_external_storage">外部文件日志</string>
   <string name="app_settings_log_to_external_storage_on">记录日志到外部存储（如果可用）</string>
@@ -75,6 +80,17 @@
   <string name="account_create_new_address_book">创建通讯录</string>
   <string name="account_refresh_calendar_list">刷新日历列表</string>
   <string name="account_create_new_calendar">创建日历</string>
+  <!--PermissionsActivity-->
+  <string name="permissions_title">DAVdroid 权限</string>
+  <string name="permissions_calendar">日历权限</string>
+  <string name="permissions_calendar_details">要把 CalDAV 事件与本地日历同步，DAVdroid 需要日历权限。</string>
+  <string name="permissions_calendar_request">请求日历权限</string>
+  <string name="permissions_contacts">通讯录权限</string>
+  <string name="permissions_contacts_details">要把 CardDAV 通讯录与本地通讯录同步，DAVdroid 需要通讯录权限。</string>
+  <string name="permissions_contacts_request">请求通讯录权限</string>
+  <string name="permissions_opentasks">OpenTasks 权限</string>
+  <string name="permissions_opentasks_details">要把 CalDAV 任务与本地任务列表同步，DAVdroid 需要访问 OpenTasks。</string>
+  <string name="permissions_opentasks_request">请求 OpenTasks 权限</string>
   <!--AddAccountActivity-->
   <string name="login_title">增加账户</string>
   <string name="login_type_email">使用邮箱地址登录</string>
@@ -88,12 +104,12 @@
   <string name="login_user_name">用户名</string>
   <string name="login_user_name_required">请输入用户名</string>
   <string name="login_base_url">根地址</string>
-  <string name="login_auth_preemptive">强制认证模式（推荐使用，但不兼容 Digest 认证方式）</string>
   <string name="login_login">登录</string>
   <string name="login_back">返回</string>
   <string name="login_create_account">创建账户</string>
   <string name="login_account_name">账户显示名</string>
   <string name="login_account_name_info">请使用你的邮箱地址作为帐户名，因为 Android 会将你创建的日历事件的创建者项设置为帐户名。你不能拥有多个帐户名相同的账户。</string>
+  <string name="login_account_contact_group_method">联系人分组方式</string>
   <string name="login_account_name_required">请输入账户名</string>
   <string name="login_account_not_created">账户无法创建</string>
   <string name="login_configuration_detection">正在配置</string>
@@ -108,9 +124,6 @@
   <string name="settings_password">密码</string>
   <string name="settings_password_summary">修改服务器密码</string>
   <string name="settings_enter_password">输入密码</string>
-  <string name="settings_preemptive">强制认证模式</string>
-  <string name="settings_preemptive_on">认证信息在每次请求中发送（推荐）</string>
-  <string name="settings_preemptive_off">认证信息在服务器要求后才发送</string>
   <string name="settings_sync">同步</string>
   <string name="settings_sync_interval_contacts">通讯录自动同步间隔</string>
   <string name="settings_sync_summary_manually">手动同步</string>
@@ -138,12 +151,33 @@
     <item>每 4 小时</item>
     <item>每 24 小时</item>
   </string-array>
+  <string name="settings_sync_wifi_only">只在 WiFi 下同步</string>
+  <string name="settings_sync_wifi_only_on">同步只在 WiFi 连接下进行</string>
+  <string name="settings_sync_wifi_only_off">同步不受数据连接类型限制</string>
+  <string name="settings_sync_wifi_only_ssid">WiFi SSID 限制</string>
+  <string name="settings_sync_wifi_only_ssid_on">同步只在 %s 网络下进行</string>
+  <string name="settings_sync_wifi_only_ssid_off">任何 WiFi 网络下均会同步</string>
+  <string name="settings_sync_wifi_only_ssid_message">输入 WiFi 网络的名称 (SSID) ，即可限制同步只在此网络下进行。留空则不限制。</string>
+  <string name="settings_carddav">CardDAV</string>
+  <string name="settings_contact_group_method">联系人分组方式</string>
+  <string-array name="settings_contact_group_method_values">
+    <item>GROUP_VCARDS</item>
+    <item>CATEGORIES</item>
+  </string-array>
+  <string-array name="settings_contact_group_method_entries">
+    <item>分为不同的 VCards</item>
+    <item>每个联系人的分类</item>
+  </string-array>
+  <string name="settings_caldav">CalDAV</string>
   <string name="settings_sync_time_range_past">旧日程时间限制</string>
   <string name="settings_sync_time_range_past_none">同步所有日程</string>
   <plurals name="settings_sync_time_range_past_days">
     <item quantity="other">%d 天前的日程不会被同步</item>
   </plurals>
   <string name="settings_sync_time_range_past_message">超过这个数字的天数的旧日程将会被忽略（可以为 0）。留空则同步所有日程。</string>
+  <string name="settings_manage_calendar_colors">管理日历颜色</string>
+  <string name="settings_manage_calendar_colors_on">日历颜色由 DAVdroid 设置</string>
+  <string name="settings_manage_calendar_colors_off">日历颜色不由 DAVdroid 设置</string>
   <string name="settings_version_update">DAVdroid 版本升级</string>
   <string name="settings_version_update_settings_updated">应用设置已更新。</string>
   <string name="settings_version_update_install_hint">出现问题了？请卸载 DAVdroid，再重新安装。</string>
@@ -175,6 +209,8 @@
   <string name="exception_show_details">显示详情</string>
   <!--sync errors and DebugInfoActivity-->
   <string name="debug_info_title">调试信息</string>
+  <string name="sync_error_permissions">DAVdroid 权限</string>
+  <string name="sync_error_permissions_text">需要额外权限</string>
   <string name="sync_error_calendar">日历同步失败（%s）</string>
   <string name="sync_error_contacts">通讯录同步失败（%s）</string>
   <string name="sync_error_tasks">任务同步失败（%s）</string>
@@ -192,7 +228,11 @@
     <item>检查远程数据</item>
     <item>比较本地和远程数据</item>
     <item>下载远程数据</item>
+    <item>预处理</item>
     <item>保存同步状态</item>
   </string-array>
   <string name="sync_error_unauthorized">用户名或密码错误</string>
+  <!--cert4android-->
+  <string name="certificate_notification_connection_security">DAVdroid: 连接安全性</string>
+  <string name="trust_certificate_unknown_certificate_found">DAVdroid 遇到了未知证书。你是否要信任该证书？</string>
 </resources>

app/src/gplay/res/menu/activity_accounts_drawer.xml

@@ -0,0 +1,54 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
+  ~ All rights reserved. This program and the accompanying materials
+  ~ are made available under the terms of the GNU Public License v3.0
+  ~ which accompanies this distribution, and is available at
+  ~ http://www.gnu.org/licenses/gpl.html
+  -->
+
+<menu xmlns:tools="http://schemas.android.com/tools"
+      xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <item
+        android:id="@+id/nav_about"
+        android:icon="@drawable/ic_info_dark"
+        android:title="@string/navigation_drawer_about"/>
+    <item
+        android:id="@+id/nav_app_settings"
+        android:icon="@drawable/ic_settings_action"
+        android:title="@string/navigation_drawer_settings"/>
+
+    <item android:title="@string/navigation_drawer_news_updates">
+        <menu>
+            <item
+                android:id="@+id/nav_twitter"
+                android:icon="@drawable/twitter"
+                android:title="\@davdroidapp"
+                tools:ignore="HardcodedText"/>
+        </menu>
+    </item>
+
+    <item android:title="@string/navigation_drawer_external_links">
+        <menu>
+            <item
+                android:id="@+id/nav_website"
+                android:icon="@drawable/ic_home_dark"
+                android:title="@string/navigation_drawer_website"/>
+            <item
+                android:id="@+id/nav_faq"
+                android:icon="@drawable/ic_help_action"
+                android:title="@string/navigation_drawer_faq"/>
+            <item
+                android:id="@+id/nav_forums"
+                android:icon="@drawable/ic_forum_dark"
+                android:title="@string/navigation_drawer_forums"/>
+            <item
+                android:id="@+id/nav_donate"
+                android:icon="@drawable/ic_attach_money_dark"
+                android:title="@string/navigation_drawer_donate"
+                android:visible="false"/>
+        </menu>
+    </item>
+
+</menu>

app/src/main/AndroidManifest.xml

@@ -12,33 +12,32 @@
           android:installLocation="internalOnly">
 
     <!-- normal permissions -->
+    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
+    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
     <uses-permission android:name="android.permission.INTERNET"/>
-    <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
-    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS"/>
     <uses-permission android:name="android.permission.READ_SYNC_SETTINGS"/>
+    <uses-permission android:name="android.permission.READ_SYNC_STATS"/>
     <uses-permission android:name="android.permission.WRITE_SYNC_SETTINGS"/>
+    <uses-permission android:name="android.permission.REQUEST_IGNORE_BATTERY_OPTIMIZATIONS"/>
+
+    <!-- account management permissions not required for own accounts since API level 22 -->
+    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS" android:maxSdkVersion="22"/>
+    <uses-permission android:name="android.permission.GET_ACCOUNTS" android:maxSdkVersion="22"/>
+    <uses-permission android:name="android.permission.MANAGE_ACCOUNTS" android:maxSdkVersion="22"/>
 
-    <!-- legacy permissions -->
     <!--
          for writing external log files; permission only required for SDK <= 18 because since then,
          writing to app-private directory doesn't require extra permissions
     -->
-    <uses-permission
-        android:name="android.permission.READ_EXTERNAL_STORAGE"
-        android:maxSdkVersion="18"
-        tools:ignore="UnusedAttribute"/>
-    <uses-permission
-        android:name="android.permission.WRITE_EXTERNAL_STORAGE"
-        android:maxSdkVersion="18"
-        tools:ignore="UnusedAttribute"/>
+    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="18"/>
+    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18"/>
 
     <!-- other permissions -->
-    <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS"/>
-    <uses-permission android:name="android.permission.READ_CONTACTS"/>
     <!-- android.permission-group.CONTACTS -->
+    <uses-permission android:name="android.permission.READ_CONTACTS"/>
     <uses-permission android:name="android.permission.WRITE_CONTACTS"/>
-    <uses-permission android:name="android.permission.READ_CALENDAR"/>
     <!-- android.permission-group.CALENDAR -->
+    <uses-permission android:name="android.permission.READ_CALENDAR"/>
     <uses-permission android:name="android.permission.WRITE_CALENDAR"/>
 
     <!-- ical4android declares task access permissions -->
@@ -47,17 +46,26 @@
         android:name=".App"
         android:allowBackup="true"
         android:fullBackupContent="false"
-        android:icon="@drawable/ic_launcher"
+        android:networkSecurityConfig="@xml/network_security_config"
+        android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme"
         tools:ignore="UnusedAttribute">
 
         <receiver
-            android:name=".App$ReinitLoggingReceiver"
+            android:name=".App$ReinitSettingsReceiver"
             android:exported="false"
             android:process=":sync">
             <intent-filter>
-                <action android:name="at.bitfire.davdroid.REINIT_LOGGER"/>
+                <action android:name="at.bitfire.davdroid.REINIT_SETTINGS"/>
+            </intent-filter>
+        </receiver>
+        <receiver
+            android:name=".AccountSettings$AppUpdatedReceiver"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.PACKAGE_REPLACED" />
+                <data android:scheme="package" android:path="at.bitfire.davdroid" />
             </intent-filter>
         </receiver>
 
@@ -127,7 +135,7 @@
                 <action android:name="android.accounts.LOGIN_ACCOUNTS_CHANGED"/>
             </intent-filter>
         </receiver>
-
+        
         <activity
             android:name=".ui.AccountsActivity"
             android:label="@string/app_name"
@@ -149,6 +157,10 @@
             android:label="@string/app_settings"
             android:parentActivityName=".ui.AccountsActivity"/>
 
+        <activity android:name=".ui.PermissionsActivity"
+                  android:label="@string/permissions_title"
+                  android:parentActivityName=".ui.AccountsActivity"/>
+
         <activity
             android:name=".ui.setup.LoginActivity"
             android:label="@string/login_title"
@@ -173,11 +185,16 @@
             android:exported="true"
             android:label="@string/debug_info_title">
         </activity>
+        <provider
+            android:name="android.support.v4.content.FileProvider"
+            android:authorities="@string/authority_log_provider"
+            android:grantUriPermissions="true"
+            android:exported="false">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/log_paths" />
+        </provider>
 
-        <!-- MemorizingTrustManager -->
-        <activity
-            android:name="de.duenndns.ssl.MemorizingActivity"
-            android:theme="@android:style/Theme.Holo.Light.Dialog.NoActionBar"/>
 
     </application>
 

app/src/main/java/at/bitfire/davdroid/AccountSettings.java

@@ -9,30 +9,29 @@ package at.bitfire.davdroid;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
+import android.annotation.SuppressLint;
+import android.annotation.TargetApi;
 import android.app.Notification;
-import android.app.NotificationManager;
+import android.app.PendingIntent;
+import android.content.BroadcastReceiver;
 import android.content.ContentProviderClient;
 import android.content.ContentResolver;
-import android.content.ContentUris;
 import android.content.ContentValues;
 import android.content.Context;
 import android.content.Intent;
 import android.content.PeriodicSync;
-import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
-import android.graphics.drawable.BitmapDrawable;
-import android.net.Uri;
+import android.os.Build;
 import android.os.Bundle;
 import android.provider.CalendarContract;
-import android.provider.CalendarContract.Calendars;
 import android.provider.ContactsContract;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.NotificationManagerCompat;
 import android.support.v7.app.NotificationCompat;
 import android.text.TextUtils;
 
 import java.lang.reflect.Method;
-import java.net.URI;
-import java.net.URISyntaxException;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Set;
@@ -48,25 +47,39 @@ import at.bitfire.davdroid.resource.LocalTaskList;
 import at.bitfire.ical4android.CalendarStorageException;
 import at.bitfire.ical4android.TaskProvider;
 import at.bitfire.vcard4android.ContactsStorageException;
+import at.bitfire.vcard4android.GroupMethod;
 import lombok.Cleanup;
 import okhttp3.HttpUrl;
 
 public class AccountSettings {
-    private final static int CURRENT_VERSION = 3;
+    private final static int CURRENT_VERSION = 4;
     private final static String
-        KEY_SETTINGS_VERSION = "version",
+            KEY_SETTINGS_VERSION = "version",
 
-        KEY_USERNAME = "user_name",
-        KEY_AUTH_PREEMPTIVE = "auth_preemptive";
+            KEY_USERNAME = "user_name",
+
+            KEY_WIFI_ONLY = "wifi_only",            // sync on WiFi only (default: false)
+            KEY_WIFI_ONLY_SSID = "wifi_only_ssid";  // restrict sync to specific WiFi SSID
 
     /** Time range limitation to the past [in days]
-        value = null              default value (DEFAULT_TIME_RANGE_PAST_DAYS)
-                < 0 (-1)          no limit
-                >= 0              entries more than n days in the past won't be synchronized
+        value = null            default value (DEFAULT_TIME_RANGE_PAST_DAYS)
+              < 0 (-1)          no limit
+              >= 0              entries more than n days in the past won't be synchronized
      */
     private final static String KEY_TIME_RANGE_PAST_DAYS = "time_range_past_days";
     private final static int DEFAULT_TIME_RANGE_PAST_DAYS = 90;
 
+    /* Whether DAVdroid sets the local calendar color to the value from service DB at every sync
+       value = null (not existing)     true (default)
+               "0"                     false */
+    private final static String KEY_MANAGE_CALENDAR_COLORS = "manage_calendar_colors";
+
+    /** Contact group method:
+        value = null (not existing)     groups as separate VCards (default)
+                "CATEGORIES"            groups are per-contact CATEGORIES
+    */
+    private final static String KEY_CONTACT_GROUP_METHOD = "contact_group_method";
+
     public final static long SYNC_INTERVAL_MANUALLY = -1;
 
     final Context context;
@@ -74,6 +87,7 @@ public class AccountSettings {
     final Account account;
 
 
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     public AccountSettings(@NonNull Context context, @NonNull Account account) throws InvalidAccountException {
         this.context = context;
         this.account = account;
@@ -94,8 +108,8 @@ public class AccountSettings {
 
             if (version < CURRENT_VERSION) {
                 Notification notify = new NotificationCompat.Builder(context)
-                        .setSmallIcon(R.drawable.ic_new_releases_light)
-                        .setLargeIcon(((BitmapDrawable)context.getResources().getDrawable(R.drawable.ic_launcher)).getBitmap())
+                        .setSmallIcon(R.drawable.ic_error_light)
+                        .setLargeIcon(App.getLauncherBitmap(context))
                         .setContentTitle(context.getString(R.string.settings_version_update))
                         .setContentText(context.getString(R.string.settings_version_update_settings_updated))
                         .setSubText(context.getString(R.string.settings_version_update_install_hint))
@@ -103,9 +117,12 @@ public class AccountSettings {
                                 .bigText(context.getString(R.string.settings_version_update_settings_updated)))
                         .setCategory(NotificationCompat.CATEGORY_SYSTEM)
                         .setPriority(NotificationCompat.PRIORITY_HIGH)
+                        .setContentIntent(PendingIntent.getActivity(context, 0,
+                                new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("faq/entry/davdroid-not-working-after-update/").build()),
+                                PendingIntent.FLAG_CANCEL_CURRENT))
                         .setLocalOnly(true)
                         .build();
-                NotificationManager nm = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
+                NotificationManagerCompat nm = NotificationManagerCompat.from(context);
                 nm.notify(Constants.NOTIFICATION_ACCOUNT_SETTINGS_UPDATED, notify);
 
                 update(version);
@@ -113,11 +130,10 @@ public class AccountSettings {
         }
     }
 
-    public static Bundle initialUserData(String userName, boolean preemptive) {
+    public static Bundle initialUserData(String userName) {
         Bundle bundle = new Bundle();
         bundle.putString(KEY_SETTINGS_VERSION, String.valueOf(CURRENT_VERSION));
         bundle.putString(KEY_USERNAME, userName);
-        bundle.putString(KEY_AUTH_PREEMPTIVE, Boolean.toString(preemptive));
         return bundle;
     }
 
@@ -130,9 +146,6 @@ public class AccountSettings {
     public String password() { return accountManager.getPassword(account); }
     public void password(@NonNull String password) { accountManager.setPassword(account, password); }
 
-    public boolean preemptiveAuth() { return Boolean.parseBoolean(accountManager.getUserData(account, KEY_AUTH_PREEMPTIVE)); }
-    public void preemptiveAuth(boolean preemptive) { accountManager.setUserData(account, KEY_AUTH_PREEMPTIVE, Boolean.toString(preemptive)); }
-
 
     // sync. settings
 
@@ -159,6 +172,27 @@ public class AccountSettings {
         }
     }
 
+    public boolean getSyncWifiOnly() {
+        return accountManager.getUserData(account, KEY_WIFI_ONLY) != null;
+    }
+
+    public void setSyncWiFiOnly(boolean wiFiOnly) {
+        accountManager.setUserData(account, KEY_WIFI_ONLY, wiFiOnly ? "1" : null);
+    }
+
+    @Nullable
+    public String getSyncWifiOnlySSID() {
+        return accountManager.getUserData(account, KEY_WIFI_ONLY_SSID);
+    }
+
+    public void setSyncWifiOnlySSID(String ssid) {
+        accountManager.setUserData(account, KEY_WIFI_ONLY_SSID, ssid);
+    }
+
+
+    // CalDAV settings
+
+    @Nullable
     public Integer getTimeRangePastDays() {
         String strDays = accountManager.getUserData(account, KEY_TIME_RANGE_PAST_DAYS);
         if (strDays != null) {
@@ -168,10 +202,40 @@ public class AccountSettings {
             return DEFAULT_TIME_RANGE_PAST_DAYS;
     }
 
-    public void setTimeRangePastDays(Integer days) {
+    public void setTimeRangePastDays(@Nullable Integer days) {
         accountManager.setUserData(account, KEY_TIME_RANGE_PAST_DAYS, String.valueOf(days == null ? -1 : days));
     }
 
+    public boolean getManageCalendarColors() {
+        return accountManager.getUserData(account, KEY_MANAGE_CALENDAR_COLORS) == null;
+    }
+
+    public void setManageCalendarColors(boolean manage) {
+        accountManager.setUserData(account, KEY_MANAGE_CALENDAR_COLORS, manage ? null : "0");
+    }
+
+
+    // CardDAV settings
+
+    @NonNull
+    public GroupMethod getGroupMethod() {
+        if (BuildConfig.settingContactGroupMethod != null)
+            return BuildConfig.settingContactGroupMethod;
+
+        final String name = accountManager.getUserData(account, KEY_CONTACT_GROUP_METHOD);
+        return name != null ?
+                GroupMethod.valueOf(name) :
+                GroupMethod.GROUP_VCARDS;
+    }
+
+    public void setGroupMethod(@NonNull GroupMethod method) {
+        if (BuildConfig.settingContactGroupMethod == null) {
+            final String name = method == GroupMethod.GROUP_VCARDS ? null : method.name();
+            accountManager.setUserData(account, KEY_CONTACT_GROUP_METHOD, name);
+        } else if (BuildConfig.settingContactGroupMethod != method)
+            throw new UnsupportedOperationException("Setting is read-only");
+    }
+
 
     // update from previous account settings
 
@@ -181,6 +245,7 @@ public class AccountSettings {
             try {
                 Method updateProc = getClass().getDeclaredMethod("update_" + fromVersion + "_" + toVersion);
                 updateProc.invoke(this);
+                accountManager.setUserData(account, KEY_SETTINGS_VERSION, String.valueOf(toVersion));
             } catch (Exception e) {
                 App.log.log(Level.SEVERE, "Couldn't update account settings", e);
             }
@@ -217,8 +282,6 @@ public class AccountSettings {
         if (!TextUtils.isEmpty(cTag))
             addr.setCTag(cTag);
         accountManager.setUserData(account, "addressbook_ctag", null);
-
-        accountManager.setUserData(account, KEY_SETTINGS_VERSION, "2");
     }
 
     @SuppressWarnings({ "Recycle", "unused" })
@@ -344,8 +407,32 @@ public class AccountSettings {
             refresh.putExtra(DavService.EXTRA_DAV_SERVICE_ID, serviceCalDAV);
             context.startService(refresh);
         }
+    }
+
+    @SuppressWarnings({ "Recycle", "unused" })
+    private void update_3_4() {
+        setGroupMethod(GroupMethod.CATEGORIES);
+    }
+
+
+    public static class AppUpdatedReceiver extends BroadcastReceiver {
+
+        @Override
+        @SuppressLint("UnsafeProtectedBroadcastReceiver,MissingPermission")
+        public void onReceive(Context context, Intent intent) {
+            App.log.info("DAVdroid was updated, checking for AccountSettings version");
+
+            // peek into AccountSettings to initiate a possible migration
+            AccountManager accountManager = AccountManager.get(context);
+            for (Account account : accountManager.getAccountsByType(context.getString(R.string.account_type)))
+                try {
+                    App.log.info("Checking account " + account.name);
+                    new AccountSettings(context, account);
+                } catch (InvalidAccountException e) {
+                    App.log.log(Level.SEVERE, "Couldn't check for updated account settings", e);
+                }
+        }
 
-        accountManager.setUserData(account, KEY_SETTINGS_VERSION, "3");
     }
 
 }

app/src/main/java/at/bitfire/davdroid/AccountsChangedReceiver.java

@@ -8,6 +8,7 @@
 
 package at.bitfire.davdroid;
 
+import android.accounts.AccountManager;
 import android.accounts.OnAccountsUpdateListener;
 import android.content.BroadcastReceiver;
 import android.content.Context;
@@ -22,12 +23,14 @@ public class AccountsChangedReceiver extends BroadcastReceiver {
 
     @Override
     public void onReceive(Context context, Intent intent) {
-        Intent serviceIntent = new Intent(context, DavService.class);
-        serviceIntent.setAction(DavService.ACTION_ACCOUNTS_UPDATED);
-        context.startService(serviceIntent);
+        if (AccountManager.LOGIN_ACCOUNTS_CHANGED_ACTION.equals(intent.getAction())) {
+            Intent serviceIntent = new Intent(context, DavService.class);
+            serviceIntent.setAction(DavService.ACTION_ACCOUNTS_UPDATED);
+            context.startService(serviceIntent);
 
-        for (OnAccountsUpdateListener listener : listeners)
-            listener.onAccountsUpdated(null);
+            for (OnAccountsUpdateListener listener : listeners)
+                listener.onAccountsUpdated(null);
+        }
     }
 
     public static void registerListener(OnAccountsUpdateListener listener, boolean callImmediately) {

app/src/main/java/at/bitfire/davdroid/App.java

@@ -8,12 +8,19 @@
 
 package at.bitfire.davdroid;
 
+import android.annotation.TargetApi;
 import android.app.Application;
-import android.app.NotificationManager;
 import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.Intent;
+import android.graphics.Bitmap;
 import android.graphics.drawable.BitmapDrawable;
+import android.graphics.drawable.Drawable;
+import android.os.Build;
+import android.os.Process;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.NotificationManagerCompat;
 import android.support.v7.app.NotificationCompat;
 import android.util.Log;
 
@@ -28,20 +35,33 @@ import java.util.logging.Logger;
 
 import javax.net.ssl.HostnameVerifier;
 
+import at.bitfire.cert4android.CustomCertManager;
 import at.bitfire.davdroid.log.LogcatHandler;
 import at.bitfire.davdroid.log.PlainTextFormatter;
 import at.bitfire.davdroid.model.ServiceDB;
 import at.bitfire.davdroid.model.Settings;
-import de.duenndns.ssl.MemorizingTrustManager;
 import lombok.Cleanup;
 import lombok.Getter;
 import okhttp3.internal.tls.OkHostnameVerifier;
 
 public class App extends Application {
-    public static final String LOG_TO_EXTERNAL_STORAGE = "logToExternalStorage";
+    public static final String
+            FLAVOR_GOOGLE_PLAY = "gplay",
+            FLAVOR_ICLOUD = "icloud",
+            FLAVOR_STANDARD = "standard";
+
+    public static final String
+            DISTRUST_SYSTEM_CERTIFICATES = "distrustSystemCerts",
+            LOG_TO_EXTERNAL_STORAGE = "logToExternalStorage",
+            OVERRIDE_PROXY = "overrideProxy",
+            OVERRIDE_PROXY_HOST = "overrideProxyHost",
+            OVERRIDE_PROXY_PORT = "overrideProxyPort";
+
+    public static final String OVERRIDE_PROXY_HOST_DEFAULT = "localhost";
+    public static final int OVERRIDE_PROXY_PORT_DEFAULT = 8118;
 
     @Getter
-    private static MemorizingTrustManager memorizingTrustManager;
+    private CustomCertManager certManager;
 
     @Getter
     private static SSLSocketFactoryCompat sslSocketFactoryCompat;
@@ -50,53 +70,64 @@ public class App extends Application {
     private static HostnameVerifier hostnameVerifier;
 
     public final static Logger log = Logger.getLogger("davdroid");
+    static {
+        at.bitfire.dav4android.Constants.log = Logger.getLogger("davdroid.dav4android");
+        at.bitfire.cert4android.Constants.log = Logger.getLogger("davdroid.cert4android");
+    }
 
     @Override
     public void onCreate() {
         super.onCreate();
-
-        // initialize MemorizingTrustManager
-        memorizingTrustManager = new MemorizingTrustManager(this);
-        sslSocketFactoryCompat = new SSLSocketFactoryCompat(memorizingTrustManager);
-        hostnameVerifier = memorizingTrustManager.wrapHostnameVerifier(OkHostnameVerifier.INSTANCE);
-
-        // initializer logger
+        reinitCertManager();
         reinitLogger();
     }
 
-    public void reinitLogger() {
-        // don't use Android default logging, we have our own handlers
-        log.setUseParentHandlers(false);
+    public void reinitCertManager() {
+        if (BuildConfig.customCerts) {
+            if (certManager != null)
+                certManager.close();
 
+            @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(this);
+            Settings settings = new Settings(dbHelper.getReadableDatabase());
+
+            certManager = new CustomCertManager(this, !settings.getBoolean(DISTRUST_SYSTEM_CERTIFICATES, false));
+            sslSocketFactoryCompat = new SSLSocketFactoryCompat(certManager);
+            hostnameVerifier = certManager.hostnameVerifier(OkHostnameVerifier.INSTANCE);
+        }
+    }
+
+    public void reinitLogger() {
         @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(this);
         Settings settings = new Settings(dbHelper.getReadableDatabase());
 
         boolean logToFile = settings.getBoolean(LOG_TO_EXTERNAL_STORAGE, false),
                 logVerbose = logToFile || Log.isLoggable(log.getName(), Log.DEBUG);
 
+        App.log.info("Verbose logging: " + logVerbose);
+
         // set logging level according to preferences
-        log.setLevel(logVerbose ? Level.ALL : Level.INFO);
+        final Logger rootLogger = Logger.getLogger("");
+        rootLogger.setLevel(logVerbose ? Level.ALL : Level.INFO);
 
-        // remove all handlers
-        for (Handler handler : log.getHandlers())
-            log.removeHandler(handler);
+        // remove all handlers and add our own logcat handler
+        rootLogger.setUseParentHandlers(false);
+        for (Handler handler : rootLogger.getHandlers())
+            rootLogger.removeHandler(handler);
+        rootLogger.addHandler(LogcatHandler.INSTANCE);
 
-        // add logcat handler
-        log.addHandler(LogcatHandler.INSTANCE);
-
-        NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
+        NotificationManagerCompat nm = NotificationManagerCompat.from(this);
         // log to external file according to preferences
         if (logToFile) {
             NotificationCompat.Builder builder = new NotificationCompat.Builder(this);
             builder .setSmallIcon(R.drawable.ic_sd_storage_light)
-                    .setLargeIcon(((BitmapDrawable)getResources().getDrawable(R.drawable.ic_launcher)).getBitmap())
+                    .setLargeIcon(getLauncherBitmap(this))
                     .setContentTitle(getString(R.string.logging_davdroid_file_logging))
                     .setLocalOnly(true);
 
             File dir = getExternalFilesDir(null);
             if (dir != null)
                 try {
-                    String fileName = new File(dir, "davdroid-" + android.os.Process.myPid() + "-" +
+                    String fileName = new File(dir, "davdroid-" + Process.myPid() + "-" +
                             DateFormatUtils.format(System.currentTimeMillis(), "yyyyMMdd-HHmmss") + ".txt").toString();
                     log.info("Logging to " + fileName);
 
@@ -125,15 +156,30 @@ public class App extends Application {
             nm.cancel(Constants.NOTIFICATION_EXTERNAL_FILE_LOGGING);
     }
 
+    @Nullable
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public static Bitmap getLauncherBitmap(@NonNull Context context) {
+        Bitmap bitmapLogo = null;
+        Drawable drawableLogo = android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.LOLLIPOP ?
+                context.getDrawable(R.mipmap.ic_launcher) :
+                context.getResources().getDrawable(R.mipmap.ic_launcher);
+        if (drawableLogo instanceof BitmapDrawable)
+            bitmapLogo = ((BitmapDrawable)drawableLogo).getBitmap();
+        return bitmapLogo;
+    }
 
-    public static class ReinitLoggingReceiver extends BroadcastReceiver {
+
+    public static class ReinitSettingsReceiver extends BroadcastReceiver {
+
+        public static final String ACTION_REINIT_SETTINGS = "at.bitfire.davdroid.REINIT_SETTINGS";
 
         @Override
         public void onReceive(Context context, Intent intent) {
-            log.info("Received broadcast: re-initializing logger");
+            log.info("Received broadcast: re-initializing settings (logger/cert manager)");
 
             App app = (App)context.getApplicationContext();
             app.reinitLogger();
+            app.reinitCertManager();
         }
 
     }

app/src/main/java/at/bitfire/davdroid/Constants.java

@@ -11,9 +11,6 @@ import android.net.Uri;
 
 public class Constants {
 
-	public static final String
-		ACCOUNT_TYPE = "bitfire.at.davdroid";
-
     // notification IDs
     public final static int
             NOTIFICATION_ACCOUNT_SETTINGS_UPDATED = 0,
@@ -21,8 +18,12 @@ public class Constants {
             NOTIFICATION_REFRESH_COLLECTIONS = 2,
             NOTIFICATION_CONTACTS_SYNC = 10,
             NOTIFICATION_CALENDAR_SYNC = 11,
-            NOTIFICATION_TASK_SYNC = 12;
+            NOTIFICATION_TASK_SYNC = 12,
+            NOTIFICATION_PERMISSIONS = 20,
+            NOTIFICATION_SUBSCRIPTION = 21;
 
-    public static final Uri webUri = Uri.parse("https://davdroid.bitfire.at/?pk_campaign=davdroid-app");
+    public static final Uri webUri = BuildConfig.FLAVOR == App.FLAVOR_ICLOUD ?
+            Uri.parse("https://multisync.cloud/?pk_campaign=multisync-app") :
+            Uri.parse("https://davdroid.bitfire.at/?pk_campaign=davdroid-app");
 
 }

app/src/main/java/at/bitfire/davdroid/DavService.java

@@ -10,8 +10,8 @@ package at.bitfire.davdroid;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
+import android.annotation.SuppressLint;
 import android.app.Notification;
-import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.app.Service;
 import android.content.ContentValues;
@@ -19,13 +19,19 @@ import android.content.Intent;
 import android.database.Cursor;
 import android.database.DatabaseUtils;
 import android.database.sqlite.SQLiteDatabase;
-import android.graphics.drawable.BitmapDrawable;
 import android.os.Binder;
 import android.os.IBinder;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.NotificationManagerCompat;
 import android.support.v7.app.NotificationCompat;
 import android.text.TextUtils;
 
+import org.apache.commons.collections4.iterators.IteratorChain;
+import org.apache.commons.collections4.iterators.SingletonIterator;
+
 import java.io.IOException;
+import java.lang.ref.WeakReference;
 import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedHashMap;
@@ -65,25 +71,30 @@ public class DavService extends Service {
     private final IBinder binder = new InfoBinder();
 
     private final Set<Long> runningRefresh = new HashSet<>();
-    private final List<RefreshingStatusListener> refreshingStatusListeners = new LinkedList<>();
+    private final List<WeakReference<RefreshingStatusListener>> refreshingStatusListeners = new LinkedList<>();
 
 
     @Override
     public int onStartCommand(Intent intent, int flags, int startId) {
-        String action = intent.getAction();
-        long id = intent.getLongExtra(EXTRA_DAV_SERVICE_ID, -1);
+        if (intent != null) {
+            String action = intent.getAction();
+            long id = intent.getLongExtra(EXTRA_DAV_SERVICE_ID, -1);
 
-        switch (action) {
-            case ACTION_ACCOUNTS_UPDATED:
-                cleanupAccounts();
-                break;
-            case ACTION_REFRESH_COLLECTIONS:
-                if (runningRefresh.add(id)) {
-                    new Thread(new RefreshCollections(id)).start();
-                    for (RefreshingStatusListener listener : refreshingStatusListeners)
-                        listener.onDavRefreshStatusChanged(id, true);
-                }
-                break;
+            switch (action) {
+                case ACTION_ACCOUNTS_UPDATED:
+                    cleanupAccounts();
+                    break;
+                case ACTION_REFRESH_COLLECTIONS:
+                    if (runningRefresh.add(id)) {
+                        new Thread(new RefreshCollections(id)).start();
+                        for (WeakReference<RefreshingStatusListener> ref : refreshingStatusListeners) {
+                            RefreshingStatusListener listener = ref.get();
+                            if (listener != null)
+                                listener.onDavRefreshStatusChanged(id, true);
+                        }
+                    }
+                    break;
+            }
         }
 
         return START_NOT_STICKY;
@@ -108,15 +119,19 @@ public class DavService extends Service {
             return runningRefresh.contains(id);
         }
 
-        public void addRefreshingStatusListener(RefreshingStatusListener listener, boolean callImmediate) {
-            refreshingStatusListeners.add(listener);
+        public void addRefreshingStatusListener(@NonNull RefreshingStatusListener listener, boolean callImmediate) {
+            refreshingStatusListeners.add(new WeakReference<>(listener));
             if (callImmediate)
                 for (long id : runningRefresh)
                     listener.onDavRefreshStatusChanged(id, true);
         }
 
-        public void removeRefreshingStatusListener(RefreshingStatusListener listener) {
-            refreshingStatusListeners.remove(listener);
+        public void removeRefreshingStatusListener(@NonNull RefreshingStatusListener listener) {
+            for (Iterator<WeakReference<RefreshingStatusListener>> iterator = refreshingStatusListeners.iterator(); iterator.hasNext(); ) {
+                RefreshingStatusListener item = iterator.next().get();
+                if (listener.equals(item))
+                    iterator.remove();
+            }
         }
     }
 
@@ -125,6 +140,7 @@ public class DavService extends Service {
        which actually do the work
      */
 
+    @SuppressLint("MissingPermission")
     void cleanupAccounts() {
         App.log.info("Cleaning up orphaned accounts");
 
@@ -134,7 +150,7 @@ public class DavService extends Service {
 
             List<String> sqlAccountNames = new LinkedList<>();
             AccountManager am = AccountManager.get(this);
-            for (Account account : am.getAccountsByType(Constants.ACCOUNT_TYPE))
+            for (Account account : am.getAccountsByType(getString(R.string.account_type)))
                 sqlAccountNames.add(DatabaseUtils.sqlEscapeString(account.name));
 
             if (sqlAccountNames.isEmpty())
@@ -217,14 +233,16 @@ public class DavService extends Service {
                     if (info.selected)
                         selectedCollections.add(HttpUrl.parse(info.url));
 
-                for (Iterator<HttpUrl> iterator = homeSets.iterator(); iterator.hasNext(); ) {
-                    HttpUrl homeSet = iterator.next();
+                for (Iterator<HttpUrl> itHomeSets = homeSets.iterator(); itHomeSets.hasNext(); ) {
+                    HttpUrl homeSet = itHomeSets.next();
                     App.log.fine("Listing home set " + homeSet);
 
                     DavResource dav = new DavResource(httpClient, homeSet);
                     try {
                         dav.propfind(1, CollectionInfo.DAV_PROPERTIES);
-                        for (DavResource member : dav.members) {
+                        IteratorChain<DavResource> itCollections = new IteratorChain<>(dav.members.iterator(), new SingletonIterator(dav));
+                        while (itCollections.hasNext()) {
+                            DavResource member = itCollections.next();
                             CollectionInfo info = CollectionInfo.fromDavResource(member);
                             info.confirmed = true;
                             App.log.log(Level.FINE, "Found collection", info);
@@ -236,7 +254,7 @@ public class DavService extends Service {
                     } catch(HttpException e) {
                         if (e.status == 403 || e.status == 404 || e.status == 410)
                             // delete home set only if it was not accessible (40x)
-                            iterator.remove();
+                            itHomeSets.remove();
                     }
                 }
 
@@ -273,8 +291,8 @@ public class DavService extends Service {
                         info.selected = true;
                 }
 
+                db.beginTransactionNonExclusive();
                 try {
-                    db.beginTransaction();
                     saveHomeSets(homeSets);
                     saveCollections(collections.values());
                     db.setTransactionSuccessful();
@@ -288,25 +306,28 @@ public class DavService extends Service {
                 App.log.log(Level.SEVERE, "Couldn't refresh collection list", e);
 
                 Intent debugIntent = new Intent(DavService.this, DebugInfoActivity.class);
-                debugIntent.putExtra(DebugInfoActivity.KEY_EXCEPTION, e);
+                debugIntent.putExtra(DebugInfoActivity.KEY_THROWABLE, e);
                 if (account != null)
                     debugIntent.putExtra(DebugInfoActivity.KEY_ACCOUNT, account);
 
-                NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);
+                NotificationManagerCompat nm = NotificationManagerCompat.from(DavService.this);
                 Notification notify = new NotificationCompat.Builder(DavService.this)
                         .setSmallIcon(R.drawable.ic_error_light)
-                        .setLargeIcon(((BitmapDrawable)getResources().getDrawable(R.drawable.ic_launcher)).getBitmap())
+                        .setLargeIcon(App.getLauncherBitmap(DavService.this))
                         .setContentTitle(getString(R.string.dav_service_refresh_failed))
                         .setContentText(getString(R.string.dav_service_refresh_couldnt_refresh))
-                        .setContentIntent(PendingIntent.getActivity(DavService.this, 0, debugIntent, 0))
+                        .setContentIntent(PendingIntent.getActivity(DavService.this, 0, debugIntent, PendingIntent.FLAG_UPDATE_CURRENT))
                         .build();
                 nm.notify(Constants.NOTIFICATION_REFRESH_COLLECTIONS, notify);
             } finally {
                 dbHelper.close();
 
                 runningRefresh.remove(service);
-                for (RefreshingStatusListener listener : refreshingStatusListeners)
-                    listener.onDavRefreshStatusChanged(service, false);
+                for (WeakReference<RefreshingStatusListener> ref : refreshingStatusListeners) {
+                    RefreshingStatusListener listener = ref.get();
+                    if (listener != null)
+                        listener.onDavRefreshStatusChanged(service, false);
+                }
             }
         }
 
@@ -333,14 +354,16 @@ public class DavService extends Service {
         }
 
 
+        @NonNull
         private Account account() {
             @Cleanup Cursor cursor = db.query(Services._TABLE, new String[] { Services.ACCOUNT_NAME }, Services.ID + "=?", new String[] { String.valueOf(service) }, null, null, null);
             if (cursor.moveToNext()) {
-                return new Account(cursor.getString(0), Constants.ACCOUNT_TYPE);
+                return new Account(cursor.getString(0), getString(R.string.account_type));
             } else
                 throw new IllegalArgumentException("Service not found");
         }
 
+        @NonNull
         private String serviceType() {
             @Cleanup Cursor cursor = db.query(Services._TABLE, new String[] { Services.SERVICE }, Services.ID + "=?", new String[] { String.valueOf(service) }, null, null, null);
             if (cursor.moveToNext())
@@ -349,6 +372,7 @@ public class DavService extends Service {
                 throw new IllegalArgumentException("Service not found");
         }
 
+        @Nullable
         private HttpUrl readPrincipal() {
             @Cleanup Cursor cursor = db.query(Services._TABLE, new String[] { Services.PRINCIPAL }, Services.ID + "=?", new String[] { String.valueOf(service) }, null, null, null);
             if (cursor.moveToNext()) {
@@ -359,6 +383,7 @@ public class DavService extends Service {
             return null;
         }
 
+        @NonNull
         private Set<HttpUrl> readHomeSets() {
             Set<HttpUrl> homeSets = new LinkedHashSet<>();
             @Cleanup Cursor cursor = db.query(HomeSets._TABLE, new String[] { HomeSets.URL }, HomeSets.SERVICE_ID + "=?", new String[] { String.valueOf(service) }, null, null, null);
@@ -377,6 +402,7 @@ public class DavService extends Service {
             }
         }
 
+        @NonNull
         private Map<HttpUrl, CollectionInfo> readCollections() {
             Map<HttpUrl, CollectionInfo> collections = new LinkedHashMap<>();
             @Cleanup Cursor cursor = db.query(Collections._TABLE, null, Collections.SERVICE_ID + "=?", new String[]{String.valueOf(service)}, null, null, null);

app/src/main/java/at/bitfire/davdroid/DavUtils.java

@@ -8,8 +8,15 @@
 
 package at.bitfire.davdroid;
 
-import java.util.regex.Matcher;
-import java.util.regex.Pattern;
+import android.support.annotation.NonNull;
+
+import org.apache.commons.lang3.StringUtils;
+
+import java.util.Collections;
+import java.util.LinkedList;
+import java.util.List;
+
+import okhttp3.HttpUrl;
 
 public class DavUtils {
 
@@ -19,4 +26,16 @@ public class DavUtils {
         return String.format("#%06X%02X", color, alpha);
     }
 
+    public static String lastSegmentOfUrl(@NonNull String url) {
+        // the list returned by HttpUrl.pathSegments() is unmodifiable, so we have to create a copy
+        List<String> segments = new LinkedList<>(HttpUrl.parse(url).pathSegments());
+        Collections.reverse(segments);
+
+        for (String segment : segments)
+            if (!StringUtils.isEmpty(segment))
+                return segment;
+
+        return "/";
+    }
+
 }

app/src/main/java/at/bitfire/davdroid/HttpClient.java

@@ -10,10 +10,14 @@ package at.bitfire.davdroid;
 
 import android.accounts.Account;
 import android.content.Context;
+import android.database.sqlite.SQLiteOpenHelper;
 import android.os.Build;
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 
 import java.io.IOException;
+import java.net.InetSocketAddress;
+import java.net.Proxy;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.Locale;
@@ -21,9 +25,9 @@ import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
-import at.bitfire.dav4android.BasicDigestAuthenticator;
-import lombok.RequiredArgsConstructor;
-import okhttp3.Credentials;
+import at.bitfire.dav4android.BasicDigestAuthHandler;
+import at.bitfire.davdroid.model.ServiceDB;
+import at.bitfire.davdroid.model.Settings;
 import okhttp3.Interceptor;
 import okhttp3.OkHttpClient;
 import okhttp3.Request;
@@ -43,40 +47,40 @@ public class HttpClient {
     private HttpClient() {
     }
 
-    public static OkHttpClient create(@NonNull Context context, @NonNull Account account, @NonNull final Logger logger) throws InvalidAccountException {
-        OkHttpClient.Builder builder = defaultBuilder(logger);
+    public static OkHttpClient create(@Nullable Context context, @NonNull Account account, @NonNull final Logger logger) throws InvalidAccountException {
+        OkHttpClient.Builder builder = defaultBuilder(context, logger);
 
-        // use account settings for authentication and logging
+        // use account settings for authentication
         AccountSettings settings = new AccountSettings(context, account);
-
-        if (settings.preemptiveAuth())
-            builder.addNetworkInterceptor(new PreemptiveAuthenticationInterceptor(settings.username(), settings.password()));
-        else
-            builder.authenticator(new BasicDigestAuthenticator(null, settings.username(), settings.password()));
+        builder = addAuthentication(builder, null, settings.username(), settings.password());
 
         return builder.build();
     }
 
-    public static OkHttpClient create(@NonNull Logger logger) {
-        return defaultBuilder(logger).build();
+    public static OkHttpClient create(@NonNull Context context, @NonNull Logger logger) {
+        return defaultBuilder(context, logger).build();
     }
 
     public static OkHttpClient create(@NonNull Context context, @NonNull Account account) throws InvalidAccountException {
         return create(context, account, App.log);
     }
 
-    public static OkHttpClient create() {
-        return create(App.log);
+    public static OkHttpClient create(@Nullable Context context) {
+        return create(context, App.log);
     }
 
-    private static OkHttpClient.Builder defaultBuilder(@NonNull final Logger logger) {
+
+    private static OkHttpClient.Builder defaultBuilder(@Nullable Context context, @NonNull final Logger logger) {
         OkHttpClient.Builder builder = client.newBuilder();
 
         // use MemorizingTrustManager to manage self-signed certificates
-        if (App.getSslSocketFactoryCompat() != null)
-            builder.sslSocketFactory(App.getSslSocketFactoryCompat());
-        if (App.getHostnameVerifier() != null)
-            builder.hostnameVerifier(App.getHostnameVerifier());
+        if (context != null) {
+            App app = (App)context.getApplicationContext();
+            if (App.getSslSocketFactoryCompat() != null && app.getCertManager() != null)
+                builder.sslSocketFactory(App.getSslSocketFactoryCompat(), app.getCertManager());
+            if (App.getHostnameVerifier() != null)
+                builder.hostnameVerifier(App.getHostnameVerifier());
+        }
 
         // set timeouts
         builder.connectTimeout(30, TimeUnit.SECONDS);
@@ -86,11 +90,33 @@ public class HttpClient {
         // don't allow redirects, because it would break PROPFIND handling
         builder.followRedirects(false);
 
+        // custom proxy support
+        if (context != null) {
+            SQLiteOpenHelper dbHelper = new ServiceDB.OpenHelper(context);
+            try {
+                Settings settings = new Settings(dbHelper.getReadableDatabase());
+                if (settings.getBoolean(App.OVERRIDE_PROXY, false)) {
+                    InetSocketAddress address = new InetSocketAddress(
+                            settings.getString(App.OVERRIDE_PROXY_HOST, App.OVERRIDE_PROXY_HOST_DEFAULT),
+                            settings.getInt(App.OVERRIDE_PROXY_PORT, App.OVERRIDE_PROXY_PORT_DEFAULT)
+                    );
+
+                    Proxy proxy = new Proxy(Proxy.Type.HTTP, address);
+                    builder.proxy(proxy);
+                    App.log.log(Level.INFO, "Using proxy", proxy);
+                }
+            } catch(IllegalArgumentException|NullPointerException e) {
+                App.log.log(Level.SEVERE, "Can't set proxy, ignoring", e);
+            } finally {
+                dbHelper.close();
+            }
+        }
+
         // add User-Agent to every request
         builder.addNetworkInterceptor(userAgentInterceptor);
 
         // add cookie store for non-persistent cookies (some services like Horde use cookies for session tracking)
-        builder.cookieJar(MemoryCookieStore.INSTANCE);
+        builder.cookieJar(new MemoryCookieStore());
 
         // add network logging, if requested
         if (logger.isLoggable(Level.FINEST)) {
@@ -107,24 +133,23 @@ public class HttpClient {
         return builder;
     }
 
-    private static OkHttpClient.Builder addAuthentication(@NonNull OkHttpClient.Builder builder, @NonNull String username, @NonNull String password, boolean preemptive) {
-        if (preemptive)
-            builder.addNetworkInterceptor(new PreemptiveAuthenticationInterceptor(username, password));
-        else
-            builder.authenticator(new BasicDigestAuthenticator(null, username, password));
-        return builder;
+    private static OkHttpClient.Builder addAuthentication(@NonNull OkHttpClient.Builder builder, @Nullable String host, @NonNull String username, @NonNull String password) {
+        BasicDigestAuthHandler authHandler = new BasicDigestAuthHandler(host, username, password);
+        return builder
+                .addNetworkInterceptor(authHandler)
+                .authenticator(authHandler);
     }
 
-    public static OkHttpClient addAuthentication(@NonNull OkHttpClient client, @NonNull String username, @NonNull String password, boolean preemptive) {
+    public static OkHttpClient addAuthentication(@NonNull OkHttpClient client, @NonNull String username, @NonNull String password) {
         OkHttpClient.Builder builder = client.newBuilder();
-        addAuthentication(builder, username, password, preemptive);
+        addAuthentication(builder, null, username, password);
         return builder.build();
     }
 
     public static OkHttpClient addAuthentication(@NonNull OkHttpClient client, @NonNull String host, @NonNull String username, @NonNull String password) {
-        return client.newBuilder()
-                .authenticator(new BasicDigestAuthenticator(host, username, password))
-                .build();
+        OkHttpClient.Builder builder = client.newBuilder();
+        addAuthentication(builder, host, username, password);
+        return builder.build();
     }
 
 
@@ -140,18 +165,4 @@ public class HttpClient {
         }
     }
 
-    @RequiredArgsConstructor
-    static class PreemptiveAuthenticationInterceptor implements Interceptor {
-        final String username, password;
-
-        @Override
-        public Response intercept(Chain chain) throws IOException {
-            App.log.fine("Adding basic authorization header for user " + username);
-            Request request = chain.request().newBuilder()
-                    .header("Authorization", Credentials.basic(username, password))
-                    .build();
-            return chain.proceed(request);
-        }
-    }
-
 }

app/src/main/java/at/bitfire/davdroid/MemoryCookieStore.java

@@ -8,10 +8,13 @@
 
 package at.bitfire.davdroid;
 
-import java.util.Collections;
+import org.apache.commons.collections4.MapIterator;
+import org.apache.commons.collections4.keyvalue.MultiKey;
+import org.apache.commons.collections4.map.HashedMap;
+import org.apache.commons.collections4.map.MultiKeyMap;
+
+import java.util.LinkedList;
 import java.util.List;
-import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 
 import okhttp3.Cookie;
 import okhttp3.CookieJar;
@@ -23,22 +26,42 @@ import okhttp3.HttpUrl;
  */
 public class MemoryCookieStore implements CookieJar {
 
-    public static final MemoryCookieStore INSTANCE = new MemoryCookieStore();
-
-    protected final Map<HttpUrl, List<Cookie>> store = new ConcurrentHashMap<>();
-
+    /**
+     * Stored cookies. The multi-key consists of three parts: name, domain, and path.
+     * This ensures that cookies can be overwritten. [RFC 6265 5.3 Storage Model]
+     * Not thread-safe!
+     */
+    protected final MultiKeyMap<String, Cookie> storage = MultiKeyMap.multiKeyMap(new HashedMap<MultiKey<? extends String>, Cookie>());
 
     @Override
     public void saveFromResponse(HttpUrl url, List<Cookie> cookies) {
-        store.put(url, cookies);
+        synchronized(storage) {
+            for (Cookie cookie : cookies)
+                storage.put(cookie.name(), cookie.domain(), cookie.path(), cookie);
+        }
     }
 
     @Override
     public List<Cookie> loadForRequest(HttpUrl url) {
-        List<Cookie> cookies = store.get(url);
+        List<Cookie> cookies = new LinkedList<>();
 
-        if (cookies == null)
-            cookies = Collections.emptyList();
+        synchronized(storage) {
+            MapIterator<MultiKey<? extends String>, Cookie> iter = storage.mapIterator();
+            while (iter.hasNext()) {
+                iter.next();
+                Cookie cookie = iter.getValue();
+
+                // remove expired cookies
+                if (cookie.expiresAt() <= System.currentTimeMillis()) {
+                    iter.remove();
+                    continue;
+                }
+
+                // add applicable cookies
+                if (cookie.matches(url))
+                    cookies.add(cookie);
+            }
+        }
 
         return cookies;
     }

app/src/main/java/at/bitfire/davdroid/SSLSocketFactoryCompat.java

@@ -15,7 +15,6 @@ import android.text.TextUtils;
 import java.io.IOException;
 import java.net.InetAddress;
 import java.net.Socket;
-import java.net.UnknownHostException;
 import java.security.GeneralSecurityException;
 import java.util.Arrays;
 import java.util.HashSet;
@@ -28,7 +27,6 @@ import javax.net.ssl.SSLSocket;
 import javax.net.ssl.SSLSocketFactory;
 import javax.net.ssl.X509TrustManager;
 
-import de.duenndns.ssl.MemorizingTrustManager;
 import lombok.Cleanup;
 
 public class SSLSocketFactoryCompat extends SSLSocketFactory {
@@ -75,8 +73,8 @@ public class SSLSocketFactoryCompat extends SSLSocketFactory {
                             "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
                             "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA");
                     List<String> availableCiphers = Arrays.asList(socket.getSupportedCipherSuites());
-                    App.log.fine("Available cipher suites: " + TextUtils.join(", ", availableCiphers));
-                    App.log.fine("Cipher suites enabled by default: " + TextUtils.join(", ", socket.getEnabledCipherSuites()));
+                    App.log.info("Available cipher suites: " + TextUtils.join(", ", availableCiphers));
+                    App.log.info("Cipher suites enabled by default: " + TextUtils.join(", ", socket.getEnabledCipherSuites()));
 
                     // take all allowed ciphers that are available and put them into preferredCiphers
                     HashSet<String> preferredCiphers = new HashSet<>(allowedCiphers);
@@ -100,10 +98,10 @@ public class SSLSocketFactoryCompat extends SSLSocketFactory {
         }
     }
 
-    public SSLSocketFactoryCompat(@NonNull MemorizingTrustManager mtm) {
+    public SSLSocketFactoryCompat(@NonNull X509TrustManager trustManager) {
         try {
             SSLContext sslContext = SSLContext.getInstance("TLS");
-            sslContext.init(null, new X509TrustManager[] { mtm }, null);
+            sslContext.init(null, new X509TrustManager[] { trustManager }, null);
             delegate = sslContext.getSocketFactory();
         } catch (GeneralSecurityException e) {
             throw new AssertionError(); // The system has no TLS. Just give up.

app/src/main/java/at/bitfire/davdroid/log/PlainTextFormatter.java

@@ -8,8 +8,6 @@
 
 package at.bitfire.davdroid.log;
 
-import android.util.Log;
-
 import org.apache.commons.lang3.StringUtils;
 import org.apache.commons.lang3.exception.ExceptionUtils;
 import org.apache.commons.lang3.time.DateFormatUtils;
@@ -33,12 +31,14 @@ public class PlainTextFormatter extends Formatter {
     public String format(LogRecord r) {
         StringBuilder builder = new StringBuilder();
 
-        if (!logcat) {
-            builder.append(DateFormatUtils.format(r.getMillis(), "yyyy-MM-dd HH:mm:ss"));
-            builder.append(String.format(" %d ", r.getThreadID()));
-        }
+        if (!logcat)
+            builder .append(DateFormatUtils.format(r.getMillis(), "yyyy-MM-dd HH:mm:ss"))
+                    .append(" ").append(r.getThreadID()).append(" ");
 
-        builder.append(String.format("[%s] %s", shortClassName(r.getSourceClassName()), r.getMessage()));
+        if (!r.getSourceClassName().replaceFirst("\\$.*", "").equals(r.getLoggerName()))
+            builder.append("[").append(shortClassName(r.getSourceClassName())).append("] ");
+
+        builder.append(r.getMessage());
 
         if (r.getThrown() != null)
             builder .append("\nEXCEPTION ")

app/src/main/java/at/bitfire/davdroid/model/HomeSet.java

@@ -1,29 +0,0 @@
-/*
- * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the GNU Public License v3.0
- * which accompanies this distribution, and is available at
- * http://www.gnu.org/licenses/gpl.html
- */
-
-package at.bitfire.davdroid.model;
-
-import android.content.ContentValues;
-
-import lombok.ToString;
-
-@ToString
-public class HomeSet {
-
-    public long id, serviceID;
-    public String URL;
-
-    public static HomeSet fromDB(ContentValues values) {
-        HomeSet homeSet = new HomeSet();
-        homeSet.id = values.getAsLong(ServiceDB.HomeSets.ID);
-        homeSet.serviceID = values.getAsLong(ServiceDB.HomeSets.SERVICE_ID);
-        homeSet.URL = values.getAsString(ServiceDB.HomeSets.URL);
-        return homeSet;
-    }
-
-}

app/src/main/java/at/bitfire/davdroid/model/Service.java

@@ -1,29 +0,0 @@
-/*
- * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the GNU Public License v3.0
- * which accompanies this distribution, and is available at
- * http://www.gnu.org/licenses/gpl.html
- */
-
-package at.bitfire.davdroid.model;
-
-import android.content.ContentValues;
-
-public class Service {
-
-    public long id;
-    public String accountName, service, principal;
-    public long lastRefresh;
-
-
-    public static Service fromDB(ContentValues values) {
-        Service service = new Service();
-        service.id = values.getAsLong(ServiceDB.Services.ID);
-        service.accountName = values.getAsString(ServiceDB.Services.ACCOUNT_NAME);
-        service.service = values.getAsString(ServiceDB.Services.SERVICE);
-        service.principal = values.getAsString(ServiceDB.Services.PRINCIPAL);
-        return service;
-    }
-
-}

app/src/main/java/at/bitfire/davdroid/model/ServiceDB.java

@@ -14,7 +14,11 @@ import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteException;
 import android.database.sqlite.SQLiteOpenHelper;
 import android.os.Build;
+import android.support.annotation.RequiresApi;
 
+import java.util.logging.Level;
+
+import aQute.service.reporter.Messages;
 import at.bitfire.davdroid.App;
 import lombok.Cleanup;
 
@@ -76,16 +80,20 @@ public class ServiceDB {
 
         @Override
         public void onOpen(SQLiteDatabase db) {
-            db.enableWriteAheadLogging();
-            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN)
-                db.setForeignKeyConstraintsEnabled(true);
-            else
+            if (Build.VERSION.SDK_INT < 16)
                 db.execSQL("PRAGMA foreign_keys=ON;");
         }
 
+        @Override
+        @RequiresApi(16)
+        public void onConfigure(SQLiteDatabase db) {
+            setWriteAheadLoggingEnabled(true);
+            db.setForeignKeyConstraintsEnabled(true);
+        }
+
         @Override
         public void onCreate(SQLiteDatabase db) {
-            App.log.info("Creating services database");
+            App.log.info("Creating database " + db.getPath());
 
             db.execSQL("CREATE TABLE " + Settings._TABLE + "(" +
                     Settings.NAME + " TEXT NOT NULL," +
@@ -116,7 +124,7 @@ public class ServiceDB {
                     Collections.DISPLAY_NAME + " TEXT NULL," +
                     Collections.DESCRIPTION + " TEXT NULL," +
                     Collections.COLOR + " INTEGER NULL," +
-                    Collections.TIME_ZONE + " TEXt NULL," +
+                    Collections.TIME_ZONE + " TEXT NULL," +
                     Collections.SUPPORTS_VEVENT + " INTEGER NULL," +
                     Collections.SUPPORTS_VTODO + " INTEGER NULL," +
                     Collections.SYNC + " INTEGER DEFAULT 0 NOT NULL" +
@@ -126,6 +134,7 @@ public class ServiceDB {
 
         @Override
         public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+            // no different versions yet
         }
 
 

app/src/main/java/at/bitfire/davdroid/model/Settings.java

@@ -11,6 +11,7 @@ package at.bitfire.davdroid.model;
 import android.content.ContentValues;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
+import android.support.annotation.Nullable;
 
 import lombok.Cleanup;
 
@@ -22,10 +23,11 @@ public class Settings {
         this.db = db;
     }
 
+
     public boolean getBoolean(String name, boolean defaultValue) {
         @Cleanup Cursor cursor = db.query(ServiceDB.Settings._TABLE, new String[] { ServiceDB.Settings.VALUE },
                 ServiceDB.Settings.NAME + "=?", new String[] { name }, null, null, null);
-        if (cursor.moveToNext())
+        if (cursor.moveToNext() && !cursor.isNull(0))
             return cursor.getInt(0) != 0;
         else
             return defaultValue;
@@ -38,6 +40,42 @@ public class Settings {
         db.insertWithOnConflict(ServiceDB.Settings._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
     }
 
+
+    public int getInt(String name, int defaultValue) {
+        @Cleanup Cursor cursor = db.query(ServiceDB.Settings._TABLE, new String[] { ServiceDB.Settings.VALUE },
+                ServiceDB.Settings.NAME + "=?", new String[] { name }, null, null, null);
+        if (cursor.moveToNext() && !cursor.isNull(0))
+            return cursor.isNull(0) ? defaultValue : cursor.getInt(0);
+        else
+            return defaultValue;
+    }
+
+    public void putInt(String name, int value) {
+        ContentValues values = new ContentValues(2);
+        values.put(ServiceDB.Settings.NAME, name);
+        values.put(ServiceDB.Settings.VALUE, value);
+        db.insertWithOnConflict(ServiceDB.Settings._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
+    }
+
+
+    @Nullable
+    public String getString(String name, @Nullable String defaultValue) {
+        @Cleanup Cursor cursor = db.query(ServiceDB.Settings._TABLE, new String[] { ServiceDB.Settings.VALUE },
+                ServiceDB.Settings.NAME + "=?", new String[] { name }, null, null, null);
+        if (cursor.moveToNext())
+            return cursor.getString(0);
+        else
+            return defaultValue;
+    }
+
+    public void putString(String name, @Nullable String value) {
+        ContentValues values = new ContentValues(2);
+        values.put(ServiceDB.Settings.NAME, name);
+        values.put(ServiceDB.Settings.VALUE, value);
+        db.insertWithOnConflict(ServiceDB.Settings._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
+    }
+
+
     public void remove(String name) {
         db.delete(ServiceDB.Settings._TABLE, ServiceDB.Settings.NAME + "=?", new String[] { name });
     }

app/src/main/java/at/bitfire/davdroid/model/UnknownProperties.java

@@ -0,0 +1,22 @@
+/*
+ * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+package at.bitfire.davdroid.model;
+
+import android.provider.ContactsContract.RawContacts;
+
+public class UnknownProperties {
+
+    public static final String CONTENT_ITEM_TYPE = "x.davdroid/unknown-properties";
+
+    public static final String
+            MIMETYPE = RawContacts.Data.MIMETYPE,
+            RAW_CONTACT_ID = RawContacts.Data.RAW_CONTACT_ID,
+            UNKNOWN_PROPERTIES = RawContacts.Data.DATA1;
+
+}

app/src/main/java/at/bitfire/davdroid/resource/LocalAddressBook.java

@@ -12,22 +12,22 @@ import android.content.ContentProviderClient;
 import android.content.ContentUris;
 import android.content.ContentValues;
 import android.database.Cursor;
+import android.net.Uri;
 import android.os.Bundle;
 import android.os.Parcel;
 import android.os.RemoteException;
-import android.provider.ContactsContract;
-import android.provider.ContactsContract.CommonDataKinds.GroupMembership;
-import android.provider.ContactsContract.Data;
 import android.provider.ContactsContract.Groups;
 import android.provider.ContactsContract.RawContacts;
+import android.support.annotation.NonNull;
 
+import java.io.FileNotFoundException;
+import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 
-import at.bitfire.davdroid.App;
 import at.bitfire.vcard4android.AndroidAddressBook;
 import at.bitfire.vcard4android.AndroidContact;
-import at.bitfire.vcard4android.AndroidGroupFactory;
+import at.bitfire.vcard4android.AndroidGroup;
 import at.bitfire.vcard4android.ContactsStorageException;
 import lombok.Cleanup;
 
@@ -40,128 +40,142 @@ public class LocalAddressBook extends AndroidAddressBook implements LocalCollect
 
     private final Bundle syncState = new Bundle();
 
+    /**
+     * Whether contact groups (LocalGroup resources) are included in query results for
+     * {@link #getAll()}, {@link #getDeleted()}, {@link #getDirty()} and
+     * {@link #getWithoutFileName()}.
+     */
+    public boolean includeGroups = true;
+
 
     public LocalAddressBook(Account account, ContentProviderClient provider) {
-        super(account, provider, AndroidGroupFactory.INSTANCE, LocalContact.Factory.INSTANCE);
+        super(account, provider, LocalGroup.Factory.INSTANCE, LocalContact.Factory.INSTANCE);
     }
 
+    public LocalContact findContactByUID(String uid) throws ContactsStorageException, FileNotFoundException {
+        LocalContact[] contacts = (LocalContact[])queryContacts(LocalContact.COLUMN_UID + "=?", new String[] { uid });
+        if (contacts.length == 0)
+            throw new FileNotFoundException();
+        return contacts[0];
+    }
 
-    /**
-     * Returns an array of local contacts, excluding those which have been modified locally (and not uploaded yet).
-     */
     @Override
-    public LocalContact[] getAll() throws ContactsStorageException {
-        return (LocalContact[])queryContacts(null, null);
+    public LocalResource[] getAll() throws ContactsStorageException {
+        List<LocalResource> all = new LinkedList<>();
+        Collections.addAll(all, (LocalResource[])queryContacts(null, null));
+        if (includeGroups)
+            Collections.addAll(all, (LocalResource[])queryGroups(null, null));
+        return all.toArray(new LocalResource[all.size()]);
     }
 
     /**
-     * Returns an array of local contacts which have been deleted locally. (DELETED != 0).
+     * Returns an array of local contacts/groups which have been deleted locally. (DELETED != 0).
      */
     @Override
-    public LocalContact[] getDeleted() throws ContactsStorageException {
-        return (LocalContact[])queryContacts(RawContacts.DELETED + "!=0", null);
+    public LocalResource[] getDeleted() throws ContactsStorageException {
+        List<LocalResource> deleted = new LinkedList<>();
+        Collections.addAll(deleted, getDeletedContacts());
+        if (includeGroups)
+            Collections.addAll(deleted, getDeletedGroups());
+        return deleted.toArray(new LocalResource[deleted.size()]);
     }
 
     /**
-     * Returns an array of local contacts which have been changed locally (DIRTY != 0).
+     * Returns an array of local contacts/groups which have been changed locally (DIRTY != 0).
      */
     @Override
-    public LocalContact[] getDirty() throws ContactsStorageException {
-        return (LocalContact[])queryContacts(RawContacts.DIRTY + "!=0", null);
+    public LocalResource[] getDirty() throws ContactsStorageException {
+        List<LocalResource> dirty = new LinkedList<>();
+        Collections.addAll(dirty, getDirtyContacts());
+        if (includeGroups)
+            Collections.addAll(dirty, getDirtyGroups());
+        return dirty.toArray(new LocalResource[dirty.size()]);
     }
 
     /**
      * Returns an array of local contacts which don't have a file name yet.
      */
     @Override
-    public LocalContact[] getWithoutFileName() throws ContactsStorageException {
-        return (LocalContact[])queryContacts(AndroidContact.COLUMN_FILENAME + " IS NULL", null);
+    public LocalResource[] getWithoutFileName() throws ContactsStorageException {
+        List<LocalResource> nameless = new LinkedList<>();
+        Collections.addAll(nameless, (LocalContact[])queryContacts(AndroidContact.COLUMN_FILENAME + " IS NULL", null));
+        if (includeGroups)
+            Collections.addAll(nameless, (LocalGroup[])queryGroups(AndroidGroup.COLUMN_FILENAME + " IS NULL", null));
+        return nameless.toArray(new LocalResource[nameless.size()]);
     }
 
-    public void deleteAll()  throws ContactsStorageException {
+    public void deleteAll() throws ContactsStorageException {
         try {
             provider.delete(syncAdapterURI(RawContacts.CONTENT_URI), null, null);
-        } catch (RemoteException e) {
-            throw new ContactsStorageException("Couldn't delete all local contacts", e);
+            provider.delete(syncAdapterURI(Groups.CONTENT_URI), null, null);
+        } catch(RemoteException e) {
+            throw new ContactsStorageException("Couldn't delete all local contacts and groups", e);
         }
     }
 
 
-    // GROUPS
+    public LocalContact[] getDeletedContacts() throws ContactsStorageException {
+        return (LocalContact[])queryContacts(RawContacts.DELETED + "!= 0", null);
+    }
+
+    public LocalContact[] getDirtyContacts() throws ContactsStorageException {
+        return (LocalContact[])queryContacts(RawContacts.DIRTY + "!= 0", null);
+    }
+
+    public LocalGroup[] getDeletedGroups() throws ContactsStorageException {
+        return (LocalGroup[])queryGroups(Groups.DELETED + "!= 0", null);
+    }
+
+    public LocalGroup[] getDirtyGroups() throws ContactsStorageException {
+        return (LocalGroup[])queryGroups(Groups.DIRTY + "!= 0", null);
+    }
+
 
     /**
-     * Finds the first group with the given title.
-     * @param displayName   title of the group to look for
-     * @return              group with given title, or null if none
+     * Finds the first group with the given title. If there is no group with this
+     * title, a new group is created.
+     * @param title     title of the group to look for
+     * @return          id of the group with given title
+     * @throws ContactsStorageException on contact provider errors
      */
-    @SuppressWarnings("Recycle")
-    public LocalGroup findGroupByTitle(String displayName) throws ContactsStorageException {
+    public long findOrCreateGroup(@NonNull String title) throws ContactsStorageException {
         try {
             @Cleanup Cursor cursor = provider.query(syncAdapterURI(Groups.CONTENT_URI),
-                    new String[] { Groups._ID },
-                    ContactsContract.Groups.TITLE + "=?", new String[] { displayName }, null);
+                    new String[] { Groups._ID  },
+                    Groups.TITLE + "=?", new String[] { title },
+                    null);
             if (cursor != null && cursor.moveToNext())
-                return new LocalGroup(this, cursor.getLong(0));
-        } catch (RemoteException e) {
+                return cursor.getLong(0);
+
+            ContentValues values = new ContentValues();
+            values.put(Groups.TITLE, title);
+            Uri uri = provider.insert(syncAdapterURI(Groups.CONTENT_URI), values);
+            return ContentUris.parseId(uri);
+        } catch(RemoteException e) {
             throw new ContactsStorageException("Couldn't find local contact group", e);
         }
-        return null;
     }
 
-    @SuppressWarnings("Recycle")
-    public LocalGroup[] getDeletedGroups() throws ContactsStorageException {
-        List<LocalGroup> groups = new LinkedList<>();
-        try {
-            @Cleanup Cursor cursor = provider.query(syncAdapterURI(Groups.CONTENT_URI),
-                    new String[] { Groups._ID },
-                    Groups.DELETED + "!=0", null, null);
-            while (cursor != null && cursor.moveToNext())
-                groups.add(new LocalGroup(this, cursor.getLong(0)));
-        } catch (RemoteException e) {
-            throw new ContactsStorageException("Couldn't query deleted groups", e);
-        }
-        return groups.toArray(new LocalGroup[groups.size()]);
+    public void removeEmptyGroups() throws ContactsStorageException {
+        // find groups without members
+        /** should be done using {@link Groups.SUMMARY_COUNT}, but it's not implemented in Android yet */
+        for (LocalGroup group : (LocalGroup[])queryGroups(null, null))
+            if (group.getMembers().length == 0)
+                group.delete();
     }
 
-    @SuppressWarnings("Recycle")
-    public LocalGroup[] getDirtyGroups() throws ContactsStorageException {
-        List<LocalGroup> groups = new LinkedList<>();
+    public void removeGroups() throws ContactsStorageException {
         try {
-            @Cleanup Cursor cursor = provider.query(syncAdapterURI(Groups.CONTENT_URI),
-                    new String[] { Groups._ID },
-                    Groups.DIRTY + "!=0", null, null);
-            while (cursor != null && cursor.moveToNext())
-                groups.add(new LocalGroup(this, cursor.getLong(0)));
-        } catch (RemoteException e) {
-            throw new ContactsStorageException("Couldn't query dirty groups", e);
-        }
-        return groups.toArray(new LocalGroup[groups.size()]);
-    }
-
-    @SuppressWarnings("Recycle")
-    public void markMembersDirty(long groupId) throws ContactsStorageException {
-        ContentValues dirty = new ContentValues(1);
-        dirty.put(RawContacts.DIRTY, 1);
-        try {
-            // query all GroupMemberships of this groupId, mark every corresponding raw contact as DIRTY
-            @Cleanup Cursor cursor = provider.query(syncAdapterURI(Data.CONTENT_URI),
-                    new String[] { GroupMembership.RAW_CONTACT_ID },
-                    Data.MIMETYPE + "=? AND " + GroupMembership.GROUP_ROW_ID + "=?",
-                    new String[] { GroupMembership.CONTENT_ITEM_TYPE, String.valueOf(groupId) }, null);
-            while (cursor != null && cursor.moveToNext()) {
-                long id = cursor.getLong(0);
-                App.log.fine("Marking raw contact #" + id + " as dirty");
-                provider.update(syncAdapterURI(ContentUris.withAppendedId(RawContacts.CONTENT_URI, id)), dirty, null, null);
-            }
-        } catch (RemoteException e) {
-            throw new ContactsStorageException("Couldn't query dirty groups", e);
+            provider.delete(syncAdapterURI(Groups.CONTENT_URI), null, null);
+        } catch(RemoteException e) {
+            throw new ContactsStorageException("Couldn't remove all groups", e);
         }
     }
 
 
     // SYNC STATE
 
-    @SuppressWarnings("Recycle")
+    @SuppressWarnings("ParcelClassLoader,Recycle")
     protected void readSyncState() throws ContactsStorageException {
         @Cleanup("recycle") Parcel parcel = Parcel.obtain();
         byte[] raw = getSyncState();

app/src/main/java/at/bitfire/davdroid/resource/LocalCalendar.java

@@ -9,14 +9,12 @@
 package at.bitfire.davdroid.resource;
 
 import android.accounts.Account;
-import android.annotation.TargetApi;
 import android.content.ContentProviderClient;
 import android.content.ContentProviderOperation;
 import android.content.ContentUris;
 import android.content.ContentValues;
 import android.database.Cursor;
 import android.net.Uri;
-import android.os.Build;
 import android.os.RemoteException;
 import android.provider.CalendarContract;
 import android.provider.CalendarContract.Calendars;
@@ -30,11 +28,11 @@ import net.fortuna.ical4j.model.component.VTimeZone;
 import org.apache.commons.lang3.StringUtils;
 
 import java.io.FileNotFoundException;
-import java.util.Collections;
 import java.util.LinkedList;
 import java.util.List;
 
 import at.bitfire.davdroid.App;
+import at.bitfire.davdroid.DavUtils;
 import at.bitfire.davdroid.model.CollectionInfo;
 import at.bitfire.ical4android.AndroidCalendar;
 import at.bitfire.ical4android.AndroidCalendarFactory;
@@ -50,10 +48,6 @@ public class LocalCalendar extends AndroidCalendar implements LocalCollection {
 
     public static final String COLUMN_CTAG = Calendars.CAL_SYNC1;
 
-    protected static final int
-            DIRTY_INCREASE_SEQUENCE = 1,
-            DIRTY_DONT_INCREASE_SEQUENCE = 2;
-
     static String[] BASE_INFO_COLUMNS = new String[] {
             Events._ID,
             Events._SYNC_ID,
@@ -71,21 +65,31 @@ public class LocalCalendar extends AndroidCalendar implements LocalCollection {
     }
 
     public static Uri create(@NonNull Account account, @NonNull ContentProviderClient provider, @NonNull CollectionInfo info) throws CalendarStorageException {
-        ContentValues values = valuesFromCollectionInfo(info);
+        ContentValues values = valuesFromCollectionInfo(info, true);
+
+        // ACCOUNT_NAME and ACCOUNT_TYPE are required (see docs)! If it's missing, other apps will crash.
+        values.put(Calendars.ACCOUNT_NAME, account.name);
+        values.put(Calendars.ACCOUNT_TYPE, account.type);
         values.put(Calendars.OWNER_ACCOUNT, account.name);
+
+        // flag as visible & synchronizable at creation, might be changed by user at any time
+        values.put(Calendars.VISIBLE, 1);
+        values.put(Calendars.SYNC_EVENTS, 1);
+
         return create(account, provider, values);
     }
 
-    public void update(CollectionInfo info) throws CalendarStorageException {
-        update(valuesFromCollectionInfo(info));
+    public void update(CollectionInfo info, boolean updateColor) throws CalendarStorageException {
+        update(valuesFromCollectionInfo(info, updateColor));
     }
 
-    @TargetApi(15)
-    private static ContentValues valuesFromCollectionInfo(CollectionInfo info) {
+    private static ContentValues valuesFromCollectionInfo(CollectionInfo info, boolean withColor) {
         ContentValues values = new ContentValues();
         values.put(Calendars.NAME, info.url);
-        values.put(Calendars.CALENDAR_DISPLAY_NAME, info.displayName);
-        values.put(Calendars.CALENDAR_COLOR, info.color != null ? info.color : defaultColor);
+        values.put(Calendars.CALENDAR_DISPLAY_NAME, !TextUtils.isEmpty(info.displayName) ? info.displayName : DavUtils.lastSegmentOfUrl(info.url));
+
+        if (withColor)
+            values.put(Calendars.CALENDAR_COLOR, info.color != null ? info.color : defaultColor);
 
         if (info.readOnly)
             values.put(Calendars.CALENDAR_ACCESS_LEVEL, Calendars.CAL_ACCESS_READ);
@@ -95,18 +99,14 @@ public class LocalCalendar extends AndroidCalendar implements LocalCollection {
             values.put(Calendars.CAN_ORGANIZER_RESPOND, 1);
         }
 
-        values.put(Calendars.SYNC_EVENTS, 1);
-        values.put(Calendars.VISIBLE, 1);
         if (!TextUtils.isEmpty(info.timeZone)) {
             VTimeZone timeZone = DateUtils.parseVTimeZone(info.timeZone);
             if (timeZone != null && timeZone.getTimeZoneId() != null)
                 values.put(Calendars.CALENDAR_TIME_ZONE, DateUtils.findAndroidTimezoneID(timeZone.getTimeZoneId().getValue()));
         }
         values.put(Calendars.ALLOWED_REMINDERS, Reminders.METHOD_ALERT);
-        if (Build.VERSION.SDK_INT >= 15) {
-            values.put(Calendars.ALLOWED_AVAILABILITY, StringUtils.join(new int[] { Reminders.AVAILABILITY_TENTATIVE, Reminders.AVAILABILITY_FREE, Reminders.AVAILABILITY_BUSY }, ","));
-            values.put(Calendars.ALLOWED_ATTENDEE_TYPES, StringUtils.join(new int[] { CalendarContract.Attendees.TYPE_OPTIONAL, CalendarContract.Attendees.TYPE_REQUIRED, CalendarContract.Attendees.TYPE_RESOURCE }, ", "));
-        }
+        values.put(Calendars.ALLOWED_AVAILABILITY, StringUtils.join(new int[] { Reminders.AVAILABILITY_TENTATIVE, Reminders.AVAILABILITY_FREE, Reminders.AVAILABILITY_BUSY }, ","));
+        values.put(Calendars.ALLOWED_ATTENDEE_TYPES, StringUtils.join(new int[] { CalendarContract.Attendees.TYPE_OPTIONAL, CalendarContract.Attendees.TYPE_REQUIRED, CalendarContract.Attendees.TYPE_RESOURCE }, ", "));
         return values;
     }
 
@@ -130,14 +130,11 @@ public class LocalCalendar extends AndroidCalendar implements LocalCollection {
     public LocalResource[] getDirty() throws CalendarStorageException, FileNotFoundException {
         List<LocalResource> dirty = new LinkedList<>();
 
-        // get dirty events which are not required to have an increased SEQUENCE value
-        Collections.addAll(dirty, (LocalEvent[])queryEvents(Events.DIRTY + "=" + DIRTY_DONT_INCREASE_SEQUENCE + " AND " + Events.ORIGINAL_ID + " IS NULL", null));
-
         // get dirty events which are required to have an increased SEQUENCE value
-        for (LocalEvent event : (LocalEvent[])queryEvents(Events.DIRTY + "=" + DIRTY_INCREASE_SEQUENCE + " AND " + Events.ORIGINAL_ID + " IS NULL", null)) {
+        for (LocalEvent event : (LocalEvent[])queryEvents(Events.DIRTY + "!=0 AND " + Events.ORIGINAL_ID + " IS NULL", null)) {
             if (event.getEvent().sequence == null)      // sequence has not been assigned yet (i.e. this event was just locally created)
                 event.getEvent().sequence = 0;
-            else
+            else if (event.weAreOrganizer)
                 event.getEvent().sequence++;
             dirty.add(event);
         }
@@ -193,14 +190,15 @@ public class LocalCalendar extends AndroidCalendar implements LocalCollection {
 
                 BatchOperation batch = new BatchOperation(provider);
                 // re-schedule original event and set it to DIRTY
-                batch.enqueue(ContentProviderOperation.newUpdate(
-                        syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, originalID)))
-                        .withValue(LocalEvent.COLUMN_SEQUENCE, originalSequence + 1)
-                        .withValue(Events.DIRTY, DIRTY_INCREASE_SEQUENCE)
-                        .build());
+                batch.enqueue(new BatchOperation.Operation(
+                        ContentProviderOperation.newUpdate(syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, originalID)))
+                                .withValue(LocalEvent.COLUMN_SEQUENCE, originalSequence + 1)
+                                .withValue(Events.DIRTY, 1)
+                ));
                 // remove exception
-                batch.enqueue(ContentProviderOperation.newDelete(
-                        syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, id))).build());
+                batch.enqueue(new BatchOperation.Operation(
+                        ContentProviderOperation.newDelete(syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, id)))
+                ));
                 batch.commit();
             }
         } catch (RemoteException e) {
@@ -222,16 +220,16 @@ public class LocalCalendar extends AndroidCalendar implements LocalCollection {
 
                 BatchOperation batch = new BatchOperation(provider);
                 // original event to DIRTY
-                batch.enqueue(ContentProviderOperation.newUpdate(
-                        syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, originalID)))
-                        .withValue(Events.DIRTY, DIRTY_DONT_INCREASE_SEQUENCE)
-                        .build());
+                batch.enqueue(new BatchOperation.Operation(
+                        ContentProviderOperation.newUpdate(syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, originalID)))
+                                .withValue(Events.DIRTY, 1)
+                ));
                 // increase SEQUENCE and set DIRTY to 0
-                batch.enqueue(ContentProviderOperation.newUpdate(
-                                syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, id)))
+                batch.enqueue(new BatchOperation.Operation(
+                        ContentProviderOperation.newUpdate(syncAdapterURI(ContentUris.withAppendedId(Events.CONTENT_URI, id)))
                                 .withValue(LocalEvent.COLUMN_SEQUENCE, sequence + 1)
                                 .withValue(Events.DIRTY, 0)
-                                .build());
+                ));
                 batch.commit();
             }
         } catch (RemoteException e) {

app/src/main/java/at/bitfire/davdroid/resource/LocalContact.java

@@ -13,16 +13,20 @@ import android.content.ContentValues;
 import android.os.RemoteException;
 import android.provider.ContactsContract;
 import android.provider.ContactsContract.CommonDataKinds.GroupMembership;
+import android.provider.ContactsContract.RawContacts.Data;
+import android.support.annotation.NonNull;
 
 import java.io.FileNotFoundException;
-import java.util.logging.Level;
+import java.util.HashSet;
+import java.util.Set;
 
-import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.BuildConfig;
+import at.bitfire.davdroid.model.UnknownProperties;
 import at.bitfire.vcard4android.AndroidAddressBook;
 import at.bitfire.vcard4android.AndroidContact;
 import at.bitfire.vcard4android.AndroidContactFactory;
 import at.bitfire.vcard4android.BatchOperation;
+import at.bitfire.vcard4android.CachedGroupMembership;
 import at.bitfire.vcard4android.Contact;
 import at.bitfire.vcard4android.ContactsStorageException;
 import ezvcard.Ezvcard;
@@ -32,6 +36,11 @@ public class LocalContact extends AndroidContact implements LocalResource {
         Contact.productID = "+//IDN bitfire.at//DAVdroid/" + BuildConfig.VERSION_NAME + " vcard4android ez-vcard/" + Ezvcard.VERSION;
     }
 
+    protected final Set<Long>
+            cachedGroupMemberships = new HashSet<>(),
+            groupMemberships = new HashSet<>();
+
+
     protected LocalContact(AndroidAddressBook addressBook, long id, String fileName, String eTag) {
         super(addressBook, id, fileName, eTag);
     }
@@ -69,53 +78,96 @@ public class LocalContact extends AndroidContact implements LocalResource {
     }
 
 
-    // group support
-
     @Override
-    protected void populateGroupMembership(ContentValues row) {
-        if (row.containsKey(GroupMembership.GROUP_ROW_ID)) {
-            long groupId = row.getAsLong(GroupMembership.GROUP_ROW_ID);
-
-            // fetch group
-            LocalGroup group = new LocalGroup(addressBook, groupId);
-            try {
-                Contact groupInfo = group.getContact();
-
-                // add to CATEGORIES
-                contact.getCategories().add(groupInfo.displayName);
-            } catch (FileNotFoundException|ContactsStorageException e) {
-                App.log.log(Level.WARNING, "Couldn't find assigned group #" + groupId + ", ignoring membership", e);
-            }
+    protected void populateData(String mimeType, ContentValues row) {
+        switch (mimeType) {
+            case CachedGroupMembership.CONTENT_ITEM_TYPE:
+                cachedGroupMemberships.add(row.getAsLong(CachedGroupMembership.GROUP_ID));
+                break;
+            case GroupMembership.CONTENT_ITEM_TYPE:
+                groupMemberships.add(row.getAsLong(GroupMembership.GROUP_ROW_ID));
+                break;
+            case UnknownProperties.CONTENT_ITEM_TYPE:
+                contact.unknownProperties = row.getAsString(UnknownProperties.UNKNOWN_PROPERTIES);
+                break;
         }
     }
 
     @Override
-    protected void insertGroupMemberships(BatchOperation batch) throws ContactsStorageException {
-        for (String category : contact.getCategories()) {
-            // Is there already a category with this display name?
-            LocalGroup group = ((LocalAddressBook)addressBook).findGroupByTitle(category);
+    protected void insertDataRows(BatchOperation batch) throws ContactsStorageException {
+        super.insertDataRows(batch);
 
-            if (group == null) {
-                // no, we have to create the group before inserting the membership
-
-                Contact groupInfo = new Contact();
-                groupInfo.displayName = category;
-                group = new LocalGroup(addressBook, groupInfo);
-                group.create();
-            }
-
-            Long groupId = group.getId();
-            if (groupId != null) {
-                ContentProviderOperation.Builder builder = ContentProviderOperation.newInsert(dataSyncURI());
-                if (id == null)
-                    builder.withValueBackReference(GroupMembership.RAW_CONTACT_ID, 0);
-                else
-                    builder.withValue(GroupMembership.RAW_CONTACT_ID, id);
-                builder .withValue(GroupMembership.MIMETYPE, GroupMembership.CONTENT_ITEM_TYPE)
-                        .withValue(GroupMembership.GROUP_ROW_ID, groupId);
-                batch.enqueue(builder.build());
+        if (contact.unknownProperties != null) {
+            final BatchOperation.Operation op;
+            final ContentProviderOperation.Builder builder = ContentProviderOperation.newInsert(dataSyncURI());
+            if (id == null) {
+                op = new BatchOperation.Operation(builder, UnknownProperties.RAW_CONTACT_ID, 0);
+            } else {
+                op = new BatchOperation.Operation(builder);
+                builder.withValue(UnknownProperties.RAW_CONTACT_ID, id);
             }
+            builder .withValue(UnknownProperties.MIMETYPE, UnknownProperties.CONTENT_ITEM_TYPE)
+                    .withValue(UnknownProperties.UNKNOWN_PROPERTIES, contact.unknownProperties);
+            batch.enqueue(op);
         }
+
+    }
+
+
+    public void addToGroup(BatchOperation batch, long groupID) {
+        assertID();
+        batch.enqueue(new BatchOperation.Operation(
+                ContentProviderOperation.newInsert(dataSyncURI())
+                        .withValue(GroupMembership.MIMETYPE, GroupMembership.CONTENT_ITEM_TYPE)
+                        .withValue(GroupMembership.RAW_CONTACT_ID, id)
+                        .withValue(GroupMembership.GROUP_ROW_ID, groupID)
+        ));
+
+        batch.enqueue(new BatchOperation.Operation(
+                ContentProviderOperation.newInsert(dataSyncURI())
+                        .withValue(CachedGroupMembership.MIMETYPE, CachedGroupMembership.CONTENT_ITEM_TYPE)
+                        .withValue(CachedGroupMembership.RAW_CONTACT_ID, id)
+                        .withValue(CachedGroupMembership.GROUP_ID, groupID)
+                        .withYieldAllowed(true)
+        ));
+    }
+
+    public void removeGroupMemberships(BatchOperation batch) {
+        assertID();
+        batch.enqueue(new BatchOperation.Operation(
+                ContentProviderOperation.newDelete(dataSyncURI())
+                        .withSelection(
+                                Data.RAW_CONTACT_ID + "=? AND " + Data.MIMETYPE + " IN (?,?)",
+                                new String[] { String.valueOf(id), GroupMembership.CONTENT_ITEM_TYPE, CachedGroupMembership.CONTENT_ITEM_TYPE }
+                        )
+                        .withYieldAllowed(true)
+        ));
+    }
+
+    /**
+     * Returns the IDs of all groups the contact was member of (cached memberships).
+     * Cached memberships are kept in sync with memberships by DAVdroid and are used to determine
+     * whether a membership has been deleted/added when a raw contact is dirty.
+     * @return set of {@link GroupMembership#GROUP_ROW_ID} (may be empty)
+     * @throws ContactsStorageException   on contact provider errors
+     * @throws FileNotFoundException      if the current contact can't be found
+     */
+    @NonNull
+    public Set<Long> getCachedGroupMemberships() throws ContactsStorageException, FileNotFoundException {
+        getContact();
+        return cachedGroupMemberships;
+    }
+
+    /**
+     * Returns the IDs of all groups the contact is member of.
+     * @return set of {@link GroupMembership#GROUP_ROW_ID}s (may be empty)
+     * @throws ContactsStorageException   on contact provider errors
+     * @throws FileNotFoundException      if the current contact can't be found
+     */
+    @NonNull
+    public Set<Long> getGroupMemberships() throws ContactsStorageException, FileNotFoundException {
+        getContact();
+        return groupMemberships;
     }
 
 
@@ -134,6 +186,7 @@ public class LocalContact extends AndroidContact implements LocalResource {
             return new LocalContact(addressBook, contact, fileName, eTag);
         }
 
+        @Override
         public LocalContact[] newArray(int size) {
             return new LocalContact[size];
         }

app/src/main/java/at/bitfire/davdroid/resource/LocalEvent.java

@@ -41,6 +41,8 @@ public class LocalEvent extends AndroidEvent implements LocalResource {
     @Getter protected String fileName;
     @Getter @Setter protected String eTag;
 
+    public boolean weAreOrganizer = true;
+
     public LocalEvent(@NonNull AndroidCalendar calendar, Event event, String fileName, String eTag) {
         super(calendar, event);
         this.fileName = fileName;
@@ -66,6 +68,12 @@ public class LocalEvent extends AndroidEvent implements LocalResource {
         event.uid = values.getAsString(COLUMN_UID);
 
         event.sequence = values.getAsInteger(COLUMN_SEQUENCE);
+        if (Build.VERSION.SDK_INT >= 17)
+            weAreOrganizer = values.getAsInteger(Events.IS_ORGANIZER) != 0;
+        else {
+            String organizer = values.getAsString(Events.ORGANIZER);
+            weAreOrganizer = organizer == null || organizer.equals(calendar.account.name);
+        }
     }
 
     @Override

app/src/main/java/at/bitfire/davdroid/resource/LocalGroup.java

@@ -8,28 +8,241 @@
 
 package at.bitfire.davdroid.resource;
 
+import android.content.ContentProviderOperation;
+import android.content.ContentUris;
 import android.content.ContentValues;
+import android.database.Cursor;
+import android.os.Parcel;
+import android.os.RemoteException;
 import android.provider.ContactsContract;
+import android.provider.ContactsContract.CommonDataKinds.GroupMembership;
+import android.provider.ContactsContract.Groups;
+import android.provider.ContactsContract.RawContacts;
+import android.provider.ContactsContract.RawContacts.Data;
 
+import org.apache.commons.lang3.ArrayUtils;
+
+import java.io.FileNotFoundException;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.logging.Level;
+
+import at.bitfire.dav4android.Constants;
 import at.bitfire.vcard4android.AndroidAddressBook;
 import at.bitfire.vcard4android.AndroidGroup;
+import at.bitfire.vcard4android.AndroidGroupFactory;
+import at.bitfire.vcard4android.BatchOperation;
+import at.bitfire.vcard4android.CachedGroupMembership;
 import at.bitfire.vcard4android.Contact;
 import at.bitfire.vcard4android.ContactsStorageException;
+import lombok.Cleanup;
+import lombok.ToString;
 
-public class LocalGroup extends AndroidGroup {
+@ToString(callSuper=true)
+public class LocalGroup extends AndroidGroup implements LocalResource {
+    /** marshalled list of member UIDs, as sent by server */
+    public static final String COLUMN_PENDING_MEMBERS = Groups.SYNC3;
 
-    public LocalGroup(AndroidAddressBook addressBook, long id) {
-        super(addressBook, id);
+    public LocalGroup(AndroidAddressBook addressBook, long id, String fileName, String eTag) {
+        super(addressBook, id, fileName, eTag);
     }
 
-    public LocalGroup(AndroidAddressBook addressBook, Contact contact) {
-        super(addressBook, contact);
+    public LocalGroup(AndroidAddressBook addressBook, Contact contact, String fileName, String eTag) {
+        super(addressBook, contact, fileName, eTag);
     }
 
-    public void clearDirty() throws ContactsStorageException {
-        ContentValues values = new ContentValues(1);
-        values.put(ContactsContract.Groups.DIRTY, 0);
+
+    @Override
+    public void clearDirty(String eTag) throws ContactsStorageException {
+        assertID();
+
+        ContentValues values = new ContentValues(2);
+        values.put(Groups.DIRTY, 0);
+        values.put(COLUMN_ETAG, this.eTag = eTag);
         update(values);
+
+        // update cached group memberships
+        BatchOperation batch = new BatchOperation(addressBook.provider);
+
+        // delete cached group memberships
+        batch.enqueue(new BatchOperation.Operation(
+                ContentProviderOperation.newDelete(addressBook.syncAdapterURI(ContactsContract.Data.CONTENT_URI))
+                        .withSelection(
+                                CachedGroupMembership.MIMETYPE + "=? AND " + CachedGroupMembership.GROUP_ID + "=?",
+                                new String[] { CachedGroupMembership.CONTENT_ITEM_TYPE, String.valueOf(id) }
+                        )
+        ));
+
+        // insert updated cached group memberships
+        for (long member : getMembers())
+            batch.enqueue(new BatchOperation.Operation(
+                    ContentProviderOperation.newInsert(addressBook.syncAdapterURI(ContactsContract.Data.CONTENT_URI))
+                            .withValue(CachedGroupMembership.MIMETYPE, CachedGroupMembership.CONTENT_ITEM_TYPE)
+                            .withValue(CachedGroupMembership.RAW_CONTACT_ID, member)
+                            .withValue(CachedGroupMembership.GROUP_ID, id)
+                            .withYieldAllowed(true)
+            ));
+
+        batch.commit();
+    }
+
+    @Override
+    public void updateFileNameAndUID(String uid) throws ContactsStorageException {
+        String newFileName = uid + ".vcf";
+
+        ContentValues values = new ContentValues(2);
+        values.put(COLUMN_FILENAME, newFileName);
+        values.put(COLUMN_UID, uid);
+        update(values);
+
+        fileName = newFileName;
+    }
+
+    @Override
+    protected ContentValues contentValues() {
+        ContentValues values = super.contentValues();
+
+        @Cleanup("recycle") Parcel members = Parcel.obtain();
+        members.writeStringList(contact.members);
+        values.put(COLUMN_PENDING_MEMBERS, members.marshall());
+
+        return values;
+    }
+
+
+    /**
+     * Marks all members of the current group as dirty.
+     */
+    public void markMembersDirty() throws ContactsStorageException {
+        assertID();
+        BatchOperation batch = new BatchOperation(addressBook.provider);
+
+        for (long member : getMembers())
+            batch.enqueue(new BatchOperation.Operation(
+                    ContentProviderOperation.newUpdate(addressBook.syncAdapterURI(ContentUris.withAppendedId(RawContacts.CONTENT_URI, member)))
+                            .withValue(RawContacts.DIRTY, 1)
+                            .withYieldAllowed(true)
+            ));
+
+        batch.commit();
+    }
+
+    /**
+     * Processes all groups with non-null {@link #COLUMN_PENDING_MEMBERS}: the pending memberships
+     * are (if possible) applied, keeping cached memberships in sync.
+     * @param addressBook    address book to take groups from
+     * @throws ContactsStorageException on contact provider errors
+     */
+    public static void applyPendingMemberships(LocalAddressBook addressBook) throws ContactsStorageException {
+        try {
+            @Cleanup Cursor cursor = addressBook.provider.query(
+                    addressBook.syncAdapterURI(Groups.CONTENT_URI),
+                    new String[] { Groups._ID, COLUMN_PENDING_MEMBERS },
+                    COLUMN_PENDING_MEMBERS + " IS NOT NULL", new String[] {},
+                    null
+            );
+
+            BatchOperation batch = new BatchOperation(addressBook.provider);
+            while (cursor != null && cursor.moveToNext()) {
+                long id = cursor.getLong(0);
+                Constants.log.fine("Assigning members to group " + id);
+
+                // delete all memberships and cached memberships for this group
+                batch.enqueue(new BatchOperation.Operation(
+                        ContentProviderOperation.newDelete(addressBook.syncAdapterURI(ContactsContract.Data.CONTENT_URI))
+                                .withSelection(
+                                        "(" + GroupMembership.MIMETYPE + "=? AND " + GroupMembership.GROUP_ROW_ID + "=?) OR (" +
+                                              CachedGroupMembership.MIMETYPE + "=? AND " + CachedGroupMembership.GROUP_ID + "=?)",
+                                        new String[] { GroupMembership.CONTENT_ITEM_TYPE, String.valueOf(id), CachedGroupMembership.CONTENT_ITEM_TYPE, String.valueOf(id) })
+                                .withYieldAllowed(true)
+                ));
+
+                // extract list of member UIDs
+                List<String> members = new LinkedList<>();
+                byte[] raw = cursor.getBlob(1);
+                @Cleanup("recycle") Parcel parcel = Parcel.obtain();
+                parcel.unmarshall(raw, 0, raw.length);
+                parcel.setDataPosition(0);
+                parcel.readStringList(members);
+
+                // insert memberships
+                for (String uid : members) {
+                    Constants.log.fine("Assigning member: " + uid);
+                    try {
+                        LocalContact member = addressBook.findContactByUID(uid);
+                        member.addToGroup(batch, id);
+                    } catch(FileNotFoundException e) {
+                        Constants.log.log(Level.WARNING, "Group member not found: " + uid, e);
+                    }
+                }
+
+                // remove pending memberships
+                batch.enqueue(new BatchOperation.Operation(
+                        ContentProviderOperation.newUpdate(addressBook.syncAdapterURI(ContentUris.withAppendedId(Groups.CONTENT_URI, id)))
+                                .withValue(COLUMN_PENDING_MEMBERS, null)
+                                .withYieldAllowed(true)
+                ));
+
+                batch.commit();
+            }
+        } catch(RemoteException e) {
+            throw new ContactsStorageException("Couldn't get pending memberships", e);
+        }
+    }
+
+
+    // helpers
+
+    private void assertID() {
+        if (id == null)
+            throw new IllegalStateException("Group has not been saved yet");
+    }
+
+    /**
+     * Lists all members of this group.
+     * @return list of all members' raw contact IDs
+     * @throws ContactsStorageException on contact provider errors
+     */
+    protected long[] getMembers() throws ContactsStorageException {
+        assertID();
+        List<Long> members = new LinkedList<>();
+        try {
+            @Cleanup Cursor cursor = addressBook.provider.query(
+                    addressBook.syncAdapterURI(ContactsContract.Data.CONTENT_URI),
+                    new String[] { Data.RAW_CONTACT_ID },
+                    GroupMembership.MIMETYPE + "=? AND " + GroupMembership.GROUP_ROW_ID + "=?",
+                    new String[] { GroupMembership.CONTENT_ITEM_TYPE, String.valueOf(id) },
+                    null
+            );
+            while (cursor != null && cursor.moveToNext())
+                members.add(cursor.getLong(0));
+        } catch(RemoteException e) {
+            throw new ContactsStorageException("Couldn't list group members", e);
+        }
+        return ArrayUtils.toPrimitive(members.toArray(new Long[members.size()]));
+    }
+
+
+    // factory
+
+    static class Factory extends AndroidGroupFactory {
+        static final Factory INSTANCE = new Factory();
+
+        @Override
+        public LocalGroup newInstance(AndroidAddressBook addressBook, long id, String fileName, String eTag) {
+            return new LocalGroup(addressBook, id, fileName, eTag);
+        }
+
+        @Override
+        public LocalGroup newInstance(AndroidAddressBook addressBook, Contact contact, String fileName, String eTag) {
+            return new LocalGroup(addressBook, contact, fileName, eTag);
+        }
+
+        @Override
+        public LocalGroup[] newArray(int size) {
+            return new LocalGroup[size];
+        }
+
     }
 
 }

app/src/main/java/at/bitfire/davdroid/resource/LocalTaskList.java

@@ -9,18 +9,21 @@
 package at.bitfire.davdroid.resource;
 
 import android.accounts.Account;
-import android.content.ContentResolver;
 import android.content.ContentValues;
+import android.content.Context;
 import android.database.Cursor;
 import android.net.Uri;
+import android.os.Build;
 import android.os.RemoteException;
 import android.support.annotation.NonNull;
+import android.text.TextUtils;
 
 import org.dmfs.provider.tasks.TaskContract.TaskLists;
 import org.dmfs.provider.tasks.TaskContract.Tasks;
 
 import java.io.FileNotFoundException;
 
+import at.bitfire.davdroid.DavUtils;
 import at.bitfire.davdroid.model.CollectionInfo;
 import at.bitfire.ical4android.AndroidTaskList;
 import at.bitfire.ical4android.AndroidTaskListFactory;
@@ -55,22 +58,25 @@ public class LocalTaskList extends AndroidTaskList implements LocalCollection {
     }
 
     public static Uri create(Account account, TaskProvider provider, CollectionInfo info) throws CalendarStorageException {
-        ContentValues values = valuesFromCollectionInfo(info);
+        ContentValues values = valuesFromCollectionInfo(info, true);
         values.put(TaskLists.OWNER, account.name);
+        values.put(TaskLists.SYNC_ENABLED, 1);
+        values.put(TaskLists.VISIBLE, 1);
         return create(account, provider, values);
     }
 
-    public void update(CollectionInfo info) throws CalendarStorageException {
-        update(valuesFromCollectionInfo(info));
+    public void update(CollectionInfo info, boolean updateColor) throws CalendarStorageException {
+        update(valuesFromCollectionInfo(info, updateColor));
     }
 
-    private static ContentValues valuesFromCollectionInfo(CollectionInfo info) {
+    private static ContentValues valuesFromCollectionInfo(CollectionInfo info, boolean withColor) {
         ContentValues values = new ContentValues();
         values.put(TaskLists._SYNC_ID, info.url);
-        values.put(TaskLists.LIST_NAME, info.displayName);
-        values.put(TaskLists.LIST_COLOR, info.color != null ? info.color : defaultColor);
-        values.put(TaskLists.SYNC_ENABLED, 1);
-        values.put(TaskLists.VISIBLE, 1);
+        values.put(TaskLists.LIST_NAME, !TextUtils.isEmpty(info.displayName) ? info.displayName : DavUtils.lastSegmentOfUrl(info.url));
+
+        if (withColor)
+            values.put(TaskLists.LIST_COLOR, info.color != null ? info.color : defaultColor);
+
         return values;
     }
 
@@ -131,12 +137,16 @@ public class LocalTaskList extends AndroidTaskList implements LocalCollection {
 
     // helpers
 
-    public static boolean tasksProviderAvailable(@NonNull ContentResolver resolver) {
+    public static boolean tasksProviderAvailable(@NonNull Context context) {
         if (tasksProviderAvailable != null)
             return tasksProviderAvailable;
         else {
-            TaskProvider provider = TaskProvider.acquire(resolver, TaskProvider.ProviderName.OpenTasks);
-            return tasksProviderAvailable = (provider != null);
+            if (Build.VERSION.SDK_INT >= 23)
+                return context.getPackageManager().resolveContentProvider(TaskProvider.ProviderName.OpenTasks.authority, 0) != null;
+            else {
+                @Cleanup TaskProvider provider = TaskProvider.acquire(context.getContentResolver(), TaskProvider.ProviderName.OpenTasks);
+                return tasksProviderAvailable = (provider != null);
+            }
         }
     }
 

app/src/main/java/at/bitfire/davdroid/syncadapter/AccountAuthenticatorService.java

@@ -21,68 +21,69 @@ import android.os.IBinder;
 import at.bitfire.davdroid.ui.setup.LoginActivity;
 
 public class AccountAuthenticatorService extends Service {
-	private static AccountAuthenticator accountAuthenticator;
 
-	private AccountAuthenticator getAuthenticator() {
-		if (accountAuthenticator != null)
-			return accountAuthenticator;
-		return accountAuthenticator = new AccountAuthenticator(this);
-	}
-	
-	@Override
-	public IBinder onBind(Intent intent) {
-		if (intent.getAction().equals(android.accounts.AccountManager.ACTION_AUTHENTICATOR_INTENT))
-			return getAuthenticator().getIBinder(); 
-		return null;
-	}
-	
-	
-	private static class AccountAuthenticator extends AbstractAccountAuthenticator {
-		final Context context;
-		
-		public AccountAuthenticator(Context context) {
-			super(context);
-			this.context = context;
-		}
+    private AccountAuthenticator accountAuthenticator;
 
-		@Override
-		public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType,
-				String[] requiredFeatures, Bundle options) throws NetworkErrorException {
-			Intent intent = new Intent(context, LoginActivity.class);
-			intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
-			Bundle bundle = new Bundle();
-			bundle.putParcelable(AccountManager.KEY_INTENT, intent);
-			return bundle;
-		}
+    @Override
+    public void onCreate() {
+        accountAuthenticator = new AccountAuthenticator(this);
+    }
 
-		@Override
-		public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options) throws NetworkErrorException {
-			return null;
-		}
+    @Override
+    public IBinder onBind(Intent intent) {
+        if (intent.getAction().equals(android.accounts.AccountManager.ACTION_AUTHENTICATOR_INTENT))
+            return accountAuthenticator.getIBinder();
+        return null;
+    }
 
-		@Override
-		public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
-			return null;
-		}
+
+    private static class AccountAuthenticator extends AbstractAccountAuthenticator {
+        final Context context;
+
+        public AccountAuthenticator(Context context) {
+            super(context);
+            this.context = context;
+        }
 
         @Override
-		public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
-			return null;
-		}
+        public Bundle addAccount(AccountAuthenticatorResponse response, String accountType, String authTokenType,
+                String[] requiredFeatures, Bundle options) throws NetworkErrorException {
+            Intent intent = new Intent(context, LoginActivity.class);
+            intent.putExtra(AccountManager.KEY_ACCOUNT_AUTHENTICATOR_RESPONSE, response);
+            Bundle bundle = new Bundle();
+            bundle.putParcelable(AccountManager.KEY_INTENT, intent);
+            return bundle;
+        }
 
-		@Override
-		public String getAuthTokenLabel(String authTokenType) {
-			return null;
-		}
+        @Override
+        public Bundle confirmCredentials(AccountAuthenticatorResponse response, Account account, Bundle options) throws NetworkErrorException {
+            return null;
+        }
 
-		@Override
-		public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features) throws NetworkErrorException {
-			return null;
-		}
+        @Override
+        public Bundle editProperties(AccountAuthenticatorResponse response, String accountType) {
+            return null;
+        }
 
-		@Override
-		public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
-			return null;
-		}
-	}
+        @Override
+        public Bundle getAuthToken(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
+            return null;
+        }
+
+        @Override
+        public String getAuthTokenLabel(String authTokenType) {
+            return null;
+        }
+
+        @Override
+        public Bundle hasFeatures(AccountAuthenticatorResponse response, Account account, String[] features) throws NetworkErrorException {
+            return null;
+        }
+
+        @Override
+        public Bundle updateCredentials(AccountAuthenticatorResponse response, Account account, String authTokenType, Bundle options) throws NetworkErrorException {
+            return null;
+        }
+
+    }
 }

app/src/main/java/at/bitfire/davdroid/syncadapter/CalendarSyncManager.java

@@ -9,17 +9,15 @@
 package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
-import android.content.ContentValues;
 import android.content.Context;
 import android.content.SyncResult;
 import android.os.Bundle;
-import android.provider.CalendarContract.Calendars;
-import android.text.TextUtils;
 
 import org.apache.commons.codec.Charsets;
 import org.apache.commons.lang3.StringUtils;
 
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.Charset;
@@ -34,12 +32,11 @@ import at.bitfire.dav4android.DavCalendar;
 import at.bitfire.dav4android.DavResource;
 import at.bitfire.dav4android.exception.DavException;
 import at.bitfire.dav4android.exception.HttpException;
-import at.bitfire.dav4android.property.CalendarColor;
 import at.bitfire.dav4android.property.CalendarData;
-import at.bitfire.dav4android.property.DisplayName;
 import at.bitfire.dav4android.property.GetCTag;
 import at.bitfire.dav4android.property.GetContentType;
 import at.bitfire.dav4android.property.GetETag;
+import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.ArrayUtils;
 import at.bitfire.davdroid.Constants;
@@ -58,21 +55,30 @@ import okhttp3.MediaType;
 import okhttp3.RequestBody;
 import okhttp3.ResponseBody;
 
+/**
+ * Synchronization manager for CalDAV collections; handles events ({@code VEVENT}).
+ */
 public class CalendarSyncManager extends SyncManager {
 
     protected static final int MAX_MULTIGET = 20;
 
 
-    public CalendarSyncManager(Context context, Account account, Bundle extras, String authority, SyncResult result, LocalCalendar calendar) throws InvalidAccountException {
-        super(Constants.NOTIFICATION_CALENDAR_SYNC, context, account, extras, authority, result);
+    public CalendarSyncManager(Context context, Account account, AccountSettings settings, Bundle extras, String authority, SyncResult result, LocalCalendar calendar) throws InvalidAccountException {
+        super(context, account, settings, extras, authority, result, "calendar/" + calendar.getId());
         localCollection = calendar;
     }
 
+    @Override
+    protected int notificationId() {
+        return Constants.NOTIFICATION_CALENDAR_SYNC;
+    }
+
     @Override
     protected String getSyncErrorTitle() {
         return context.getString(R.string.sync_error_calendar, account.name);
     }
 
+
     @Override
     protected void prepare() {
         collectionURL = HttpUrl.parse(localCalendar().getName());
@@ -94,9 +100,14 @@ public class CalendarSyncManager extends SyncManager {
     @Override
     protected RequestBody prepareUpload(LocalResource resource) throws IOException, CalendarStorageException {
         LocalEvent local = (LocalEvent)resource;
+        App.log.log(Level.FINE, "Preparing upload of event " + local.getFileName(), local.getEvent());
+
+        ByteArrayOutputStream os = new ByteArrayOutputStream();
+        local.getEvent().write(os);
+
         return RequestBody.create(
                 DavCalendar.MIME_ICALENDAR,
-                local.getEvent().toStream().toByteArray()
+                os.toByteArray()
         );
     }
 
@@ -137,7 +148,11 @@ public class CalendarSyncManager extends SyncManager {
                 DavResource remote = bunch[0];
 
                 ResponseBody body = remote.get("text/calendar");
-                String eTag = ((GetETag)remote.properties.get(GetETag.NAME)).eTag;
+
+                // CalDAV servers MUST return ETag on GET [https://tools.ietf.org/html/rfc4791#section-5.3.4]
+                GetETag eTag = (GetETag)remote.properties.get(GetETag.NAME);
+                if (eTag == null || StringUtils.isEmpty(eTag.eTag))
+                    throw new DavException("Received CalDAV GET response without ETag for " + remote.location);
 
                 Charset charset = Charsets.UTF_8;
                 MediaType contentType = body.contentType();
@@ -145,7 +160,7 @@ public class CalendarSyncManager extends SyncManager {
                     charset = contentType.charset(Charsets.UTF_8);
 
                 @Cleanup InputStream stream = body.byteStream();
-                processVEvent(remote.fileName(), eTag, stream, charset);
+                processVEvent(remote.fileName(), eTag.eTag, stream, charset);
 
             } else {
                 // multiple contacts, use multi-get

app/src/main/java/at/bitfire/davdroid/syncadapter/CalendarsSyncAdapterService.java

@@ -8,29 +8,32 @@
 package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
-import android.app.Service;
 import android.content.AbstractThreadedSyncAdapter;
 import android.content.ContentProviderClient;
+import android.content.ContentResolver;
 import android.content.ContentValues;
 import android.content.Context;
-import android.content.Intent;
 import android.content.SyncResult;
 import android.database.Cursor;
 import android.database.DatabaseUtils;
 import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteException;
+import android.database.sqlite.SQLiteOpenHelper;
 import android.os.Bundle;
-import android.os.IBinder;
 import android.provider.CalendarContract;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.logging.Level;
 
+import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.model.CollectionInfo;
+import at.bitfire.davdroid.model.ServiceDB;
 import at.bitfire.davdroid.model.ServiceDB.Collections;
-import at.bitfire.davdroid.model.ServiceDB.OpenHelper;
 import at.bitfire.davdroid.model.ServiceDB.Services;
 import at.bitfire.davdroid.resource.LocalCalendar;
 import at.bitfire.ical4android.CalendarStorageException;
@@ -39,88 +42,103 @@ import lombok.Cleanup;
 public class CalendarsSyncAdapterService extends SyncAdapterService {
 
     @Override
-    public void onCreate() {
-        super.onCreate();
-        syncAdapter = new SyncAdapter(this, dbHelper);
+    protected AbstractThreadedSyncAdapter syncAdapter() {
+        return new SyncAdapter(this);
     }
 
 
 	private static class SyncAdapter extends SyncAdapterService.SyncAdapter {
 
-        public SyncAdapter(Context context, OpenHelper dbHelper) {
-            super(context, dbHelper);
+        public SyncAdapter(Context context) {
+            super(context);
         }
 
         @Override
-        public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
-            super.onPerformSync(account, extras, authority, provider, syncResult);
-
+        public void sync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
             try {
-                updateLocalCalendars(provider, account);
+                AccountSettings settings = new AccountSettings(getContext(), account);
+                if (!extras.containsKey(ContentResolver.SYNC_EXTRAS_MANUAL) && !checkSyncConditions(settings))
+                    return;
+
+                updateLocalCalendars(provider, account, settings);
 
                 for (LocalCalendar calendar : (LocalCalendar[])LocalCalendar.find(account, provider, LocalCalendar.Factory.INSTANCE, CalendarContract.Calendars.SYNC_EVENTS + "!=0", null)) {
                     App.log.info("Synchronizing calendar #"  + calendar.getId() + ", URL: " + calendar.getName());
-                    CalendarSyncManager syncManager = new CalendarSyncManager(getContext(), account, extras, authority, syncResult, calendar);
+                    CalendarSyncManager syncManager = new CalendarSyncManager(getContext(), account, settings, extras, authority, syncResult, calendar);
                     syncManager.performSync();
                 }
-            } catch (CalendarStorageException e) {
-                App.log.log(Level.SEVERE, "Couldn't enumerate local calendars", e);
+            } catch(CalendarStorageException|SQLiteException e) {
+                App.log.log(Level.SEVERE, "Couldn't prepare local calendars", e);
                 syncResult.databaseError = true;
-            } catch (InvalidAccountException e) {
+            } catch(InvalidAccountException e) {
                 App.log.log(Level.SEVERE, "Couldn't get account settings", e);
             }
 
             App.log.info("Calendar sync complete");
         }
 
-        private void updateLocalCalendars(ContentProviderClient provider, Account account) throws CalendarStorageException {
-            long service = getService(account);
+        private void updateLocalCalendars(ContentProviderClient provider, Account account, AccountSettings settings) throws CalendarStorageException {
+            SQLiteOpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
+            try {
+                // enumerate remote and local calendars
+                SQLiteDatabase db = dbHelper.getReadableDatabase();
+                Long service = getService(db, account);
+                Map<String, CollectionInfo> remote = remoteCalendars(db, service);
 
-            // enumerate remote and local calendars
-            Map<String, CollectionInfo> remote = remoteCalendars(service);
-            LocalCalendar[] local = (LocalCalendar[])LocalCalendar.find(account, provider, LocalCalendar.Factory.INSTANCE, null, null);
+                LocalCalendar[] local = (LocalCalendar[])LocalCalendar.find(account, provider, LocalCalendar.Factory.INSTANCE, null, null);
 
-            // delete obsolete local calendar
-            for (LocalCalendar calendar : local) {
-                String url = calendar.getName();
-                if (!remote.containsKey(url)) {
-                    App.log.fine("Deleting obsolete local calendar " + url);
-                    calendar.delete();
-                } else {
-                    // remote CollectionInfo found for this local collection, update data
-                    CollectionInfo info = remote.get(url);
-                    App.log.fine("Updating local calendar " + url + " with " + info);
-                    calendar.update(info);
-                    // we already have a local calendar for this remote collection, don't take into consideration anymore
-                    remote.remove(url);
+                boolean updateColors = settings.getManageCalendarColors();
+
+                // delete obsolete local calendar
+                for (LocalCalendar calendar : local) {
+                    String url = calendar.getName();
+                    if (!remote.containsKey(url)) {
+                        App.log.fine("Deleting obsolete local calendar " + url);
+                        calendar.delete();
+                    } else {
+                        // remote CollectionInfo found for this local collection, update data
+                        CollectionInfo info = remote.get(url);
+                        App.log.fine("Updating local calendar " + url + " with " + info);
+                        calendar.update(info, updateColors);
+                        // we already have a local calendar for this remote collection, don't take into consideration anymore
+                        remote.remove(url);
+                    }
                 }
-            }
 
-            // create new local calendars
-            for (String url : remote.keySet()) {
-                CollectionInfo info = remote.get(url);
-                App.log.info("Adding local calendar list " + info);
-                LocalCalendar.create(account, provider, info);
+                // create new local calendars
+                for (String url : remote.keySet()) {
+                    CollectionInfo info = remote.get(url);
+                    App.log.info("Adding local calendar list " + info);
+                    LocalCalendar.create(account, provider, info);
+                }
+            } finally {
+                dbHelper.close();
             }
         }
 
-        long getService(Account account) {
-            @Cleanup Cursor c = db.query(Services._TABLE, new String[]{ Services.ID },
-                    Services.ACCOUNT_NAME + "=? AND " + Services.SERVICE + "=?", new String[]{account.name, Services.SERVICE_CALDAV}, null, null, null);
-            c.moveToNext();
-            return c.getLong(0);
+        @Nullable
+        Long getService(@NonNull SQLiteDatabase db, @NonNull Account account) {
+            @Cleanup Cursor c = db.query(Services._TABLE, new String[] { Services.ID },
+                    Services.ACCOUNT_NAME + "=? AND " + Services.SERVICE + "=?", new String[] { account.name, Services.SERVICE_CALDAV }, null, null, null);
+            if (c.moveToNext())
+                return c.getLong(0);
+            else
+                return null;
         }
 
-        private Map<String, CollectionInfo> remoteCalendars(long service) {
+        @NonNull
+        private Map<String, CollectionInfo> remoteCalendars(@NonNull SQLiteDatabase db, Long service) {
             Map<String, CollectionInfo> collections = new LinkedHashMap<>();
-            @Cleanup Cursor cursor = db.query(Collections._TABLE, null,
-                    Collections.SERVICE_ID + "=? AND " + Collections.SUPPORTS_VEVENT + "!=0 AND " + Collections.SYNC,
-                    new String[] { String.valueOf(service) }, null, null, null);
-            while (cursor.moveToNext()) {
-                ContentValues values = new ContentValues();
-                DatabaseUtils.cursorRowToContentValues(cursor, values);
-                CollectionInfo info = CollectionInfo.fromDB(values);
-                collections.put(info.url, info);
+            if (service != null) {
+                @Cleanup Cursor cursor = db.query(Collections._TABLE, null,
+                        Collections.SERVICE_ID + "=? AND " + Collections.SUPPORTS_VEVENT + "!=0 AND " + Collections.SYNC,
+                        new String[] { String.valueOf(service) }, null, null, null);
+                while (cursor.moveToNext()) {
+                    ContentValues values = new ContentValues();
+                    DatabaseUtils.cursorRowToContentValues(cursor, values);
+                    CollectionInfo info = CollectionInfo.fromDB(values);
+                    collections.put(info.url, info);
+                }
             }
             return collections;
         }

app/src/main/java/at/bitfire/davdroid/syncadapter/ContactsSyncAdapterService.java

@@ -8,22 +8,20 @@
 package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
-import android.app.Service;
 import android.content.AbstractThreadedSyncAdapter;
 import android.content.ContentProviderClient;
+import android.content.ContentResolver;
 import android.content.ContentValues;
 import android.content.Context;
-import android.content.Intent;
 import android.content.SyncResult;
 import android.database.Cursor;
 import android.database.DatabaseUtils;
 import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
 import android.os.Bundle;
-import android.os.IBinder;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 
-import java.util.List;
 import java.util.logging.Level;
 
 import at.bitfire.davdroid.AccountSettings;
@@ -32,47 +30,56 @@ import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.model.CollectionInfo;
 import at.bitfire.davdroid.model.ServiceDB;
 import at.bitfire.davdroid.model.ServiceDB.Collections;
-import at.bitfire.davdroid.model.ServiceDB.OpenHelper;
 import lombok.Cleanup;
 
 public class ContactsSyncAdapterService extends SyncAdapterService {
 
-	@Override
-	public void onCreate() {
-        super.onCreate();
-        syncAdapter = new ContactsSyncAdapter(this, dbHelper);
-	}
+    @Override
+    protected AbstractThreadedSyncAdapter syncAdapter() {
+        return new ContactsSyncAdapter(this);
+    }
 
 
 	private static class ContactsSyncAdapter extends SyncAdapter {
 
-        public ContactsSyncAdapter(Context context, OpenHelper dbHelper) {
-            super(context, dbHelper);
+        public ContactsSyncAdapter(Context context) {
+            super(context);
         }
 
         @Override
-        public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
-            super.onPerformSync(account, extras, authority, provider, syncResult);
+        public void sync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
+            SQLiteOpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
+            try {
+                AccountSettings settings = new AccountSettings(getContext(), account);
+                if (!extras.containsKey(ContentResolver.SYNC_EXTRAS_MANUAL) && !checkSyncConditions(settings))
+                    return;
 
-            Long service = getService(account);
-            if (service != null) {
-                CollectionInfo remote = remoteAddressBook(service);
-                if (remote != null)
-                    try {
-                        ContactsSyncManager syncManager = new ContactsSyncManager(getContext(), account, extras, authority, provider, syncResult, remote);
-                        syncManager.performSync();
-                    } catch (InvalidAccountException e) {
-                        App.log.log(Level.SEVERE, "Couldn't get account settings", e);
-                    }
-                else
-                    App.log.info("No address book collection selected for synchronization");
+                SQLiteDatabase db = dbHelper.getReadableDatabase();
+                Long service = getService(db, account);
+                if (service != null) {
+                    CollectionInfo remote = remoteAddressBook(db, service);
+                    if (remote != null)
+                        try {
+                            ContactsSyncManager syncManager = new ContactsSyncManager(getContext(), account, settings, extras, authority, provider, syncResult, remote);
+                            syncManager.performSync();
+                        } catch(InvalidAccountException e) {
+                            App.log.log(Level.SEVERE, "Couldn't get account settings", e);
+                        }
+                    else
+                        App.log.info("No address book collection selected for synchronization");
+                } else
+                    App.log.info("No CardDAV service found in DB");
+            } catch (InvalidAccountException e) {
+                App.log.log(Level.SEVERE, "Couldn't get account settings", e);
+            } finally {
+                dbHelper.close();
             }
 
             App.log.info("Address book sync complete");
         }
 
         @Nullable
-        private Long getService(@NonNull Account account) {
+        private Long getService(@NonNull SQLiteDatabase db, @NonNull Account account) {
             @Cleanup Cursor c = db.query(ServiceDB.Services._TABLE, new String[] { ServiceDB.Services.ID },
                     ServiceDB.Services.ACCOUNT_NAME + "=? AND " + ServiceDB.Services.SERVICE + "=?", new String[] { account.name, ServiceDB.Services.SERVICE_CARDDAV }, null, null, null);
             if (c.moveToNext())
@@ -82,7 +89,7 @@ public class ContactsSyncAdapterService extends SyncAdapterService {
         }
 
         @Nullable
-        private CollectionInfo remoteAddressBook(long service) {
+        private CollectionInfo remoteAddressBook(@NonNull SQLiteDatabase db, long service) {
             @Cleanup Cursor c = db.query(Collections._TABLE, null,
                     Collections.SERVICE_ID + "=? AND " + Collections.SYNC, new String[] { String.valueOf(service) }, null, null, null);
             if (c.moveToNext()) {

app/src/main/java/at/bitfire/davdroid/syncadapter/ContactsSyncManager.java

@@ -10,20 +10,33 @@ package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
 import android.content.ContentProviderClient;
+import android.content.ContentProviderOperation;
+import android.content.ContentUris;
+import android.content.ContentValues;
 import android.content.Context;
 import android.content.SyncResult;
+import android.database.Cursor;
 import android.os.Bundle;
+import android.os.RemoteException;
+import android.provider.ContactsContract;
+import android.provider.ContactsContract.Groups;
+import android.support.annotation.NonNull;
+import android.text.TextUtils;
 
 import org.apache.commons.codec.Charsets;
+import org.apache.commons.collections4.SetUtils;
 import org.apache.commons.lang3.StringUtils;
 
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.Charset;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Set;
 import java.util.logging.Level;
 
 import at.bitfire.dav4android.DavAddressBook;
@@ -34,7 +47,9 @@ import at.bitfire.dav4android.property.AddressData;
 import at.bitfire.dav4android.property.GetCTag;
 import at.bitfire.dav4android.property.GetContentType;
 import at.bitfire.dav4android.property.GetETag;
+import at.bitfire.dav4android.property.ResourceType;
 import at.bitfire.dav4android.property.SupportedAddressData;
+import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.ArrayUtils;
 import at.bitfire.davdroid.Constants;
@@ -47,8 +62,10 @@ import at.bitfire.davdroid.resource.LocalContact;
 import at.bitfire.davdroid.resource.LocalGroup;
 import at.bitfire.davdroid.resource.LocalResource;
 import at.bitfire.ical4android.CalendarStorageException;
+import at.bitfire.vcard4android.BatchOperation;
 import at.bitfire.vcard4android.Contact;
 import at.bitfire.vcard4android.ContactsStorageException;
+import at.bitfire.vcard4android.GroupMethod;
 import ezvcard.VCardVersion;
 import ezvcard.util.IOUtils;
 import lombok.Cleanup;
@@ -61,20 +78,62 @@ import okhttp3.RequestBody;
 import okhttp3.Response;
 import okhttp3.ResponseBody;
 
+/**
+ * <p>Synchronization manager for CardDAV collections; handles contacts and groups.</p>
+ *
+ * <p></p>Group handling differs according to the {@link #groupMethod}. There are two basic methods to
+ * handle/manage groups:</p>
+ * <ul>
+ *     <li>{@code CATEGORIES}: groups memberships are attached to each contact and represented as
+ *     "category". When a group is dirty or has been deleted, all its members have to be set to
+ *     dirty, too (because they have to be uploaded without the respective category). This
+ *     is done in {@link #prepareDirty()}. Empty groups can be deleted without further processing,
+ *     which is done in {@link #postProcess()} because groups may become empty after downloading
+ *     updated remoted contacts.</li>
+ *     <li>Groups as separate VCards: individual and group contacts (with a list of member UIDs) are
+ *     distinguished. When a local group is dirty, its members don't need to be set to dirty.
+ *     <ol>
+ *         <li>However, when a contact is dirty, it has
+ *         to be checked whether its group memberships have changed. In this case, the respective
+ *         groups have to be set to dirty. For instance, if contact A is in group G and H, and then
+ *         group membership of G is removed, the contact will be set to dirty because of the changed
+ *         {@link android.provider.ContactsContract.CommonDataKinds.GroupMembership}. DAVdroid will
+ *         then have to check whether the group memberships have actually changed, and if so,
+ *         all affected groups have to be set to dirty. To detect changes in group memberships,
+ *         DAVdroid always mirrors all {@link android.provider.ContactsContract.CommonDataKinds.GroupMembership}
+ *         data rows in respective {@link at.bitfire.vcard4android.CachedGroupMembership} rows.
+ *         If the cached group memberships are not the same as the current group member ships, the
+ *         difference set (in our example G, because its in the cached memberships, but not in the
+ *         actual ones) is marked as dirty. This is done in {@link #prepareDirty()}.</li>
+ *         <li>When downloading remote contacts, groups (+ member information) may be received
+ *         by the actual members. Thus, the member lists have to be cached until all VCards
+ *         are received. This is done by caching the member UIDs of each group in
+ *         {@link LocalGroup#COLUMN_PENDING_MEMBERS}. In {@link #postProcess()},
+ *         these "pending memberships" are assigned to the actual contacs and then cleaned up.</li>
+ *     </ol>
+ * </ul>
+ */
 public class ContactsSyncManager extends SyncManager {
     protected static final int MAX_MULTIGET = 10;
 
     final private ContentProviderClient provider;
     final private CollectionInfo remote;
+
     private boolean hasVCard4;
+    private GroupMethod groupMethod;
 
 
-    public ContactsSyncManager(Context context, Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult result, CollectionInfo remote) throws InvalidAccountException {
-        super(Constants.NOTIFICATION_CONTACTS_SYNC, context, account, extras, authority, result);
+    public ContactsSyncManager(Context context, Account account, AccountSettings settings, Bundle extras, String authority, ContentProviderClient provider, SyncResult result, CollectionInfo remote) throws InvalidAccountException {
+        super(context, account, settings, extras, authority, result, "addressBook");
         this.provider = provider;
         this.remote = remote;
     }
 
+    @Override
+    protected int notificationId() {
+        return Constants.NOTIFICATION_CONTACTS_SYNC;
+    }
+
     @Override
     protected String getSyncErrorTitle() {
         return context.getString(R.string.sync_error_contacts, account.name);
@@ -85,65 +144,141 @@ public class ContactsSyncManager extends SyncManager {
     protected void prepare() throws ContactsStorageException {
         // prepare local address book
         localCollection = new LocalAddressBook(account, provider);
+        LocalAddressBook localAddressBook = localAddressBook();
 
         String url = remote.url;
-        String lastUrl = localAddressBook().getURL();
+        String lastUrl = localAddressBook.getURL();
         if (!url.equals(lastUrl)) {
             App.log.info("Selected address book has changed from " + lastUrl + " to " + url + ", deleting all local contacts");
-            ((LocalAddressBook)localCollection).deleteAll();
+            localAddressBook.deleteAll();
         }
 
+        // set up Contacts Provider Settings
+        ContentValues values = new ContentValues(2);
+        values.put(ContactsContract.Settings.SHOULD_SYNC, 1);
+        values.put(ContactsContract.Settings.UNGROUPED_VISIBLE, 1);
+        localAddressBook.updateSettings(values);
+
         collectionURL = HttpUrl.parse(url);
         davCollection = new DavAddressBook(httpClient, collectionURL);
-
-        processChangedGroups();
     }
 
     @Override
     protected void queryCapabilities() throws DavException, IOException, HttpException {
         // prepare remote address book
-        hasVCard4 = false;
         davCollection.propfind(0, SupportedAddressData.NAME, GetCTag.NAME);
-        SupportedAddressData supportedAddressData = (SupportedAddressData) davCollection.properties.get(SupportedAddressData.NAME);
-        if (supportedAddressData != null)
-            for (MediaType type : supportedAddressData.types)
-                if ("text/vcard; version=4.0".equalsIgnoreCase(type.toString()))
-                    hasVCard4 = true;
+        SupportedAddressData supportedAddressData = (SupportedAddressData)davCollection.properties.get(SupportedAddressData.NAME);
+        hasVCard4 = supportedAddressData != null && supportedAddressData.hasVCard4();
         App.log.info("Server advertises VCard/4 support: " + hasVCard4);
+
+        groupMethod = settings.getGroupMethod();
+        App.log.info("Contact group method: " + groupMethod);
+
+        localAddressBook().includeGroups = groupMethod == GroupMethod.GROUP_VCARDS;
     }
 
     @Override
-    protected RequestBody prepareUpload(LocalResource resource) throws IOException, ContactsStorageException {
-        LocalContact local = (LocalContact)resource;
+    protected void prepareDirty() throws CalendarStorageException, ContactsStorageException {
+        super.prepareDirty();
+
+        LocalAddressBook addressBook = localAddressBook();
+
+        if (groupMethod == GroupMethod.CATEGORIES) {
+            /* groups memberships are represented as contact CATEGORIES */
+
+            // groups with DELETED=1: set all members to dirty, then remove group
+            for (LocalGroup group : addressBook.getDeletedGroups()) {
+                App.log.fine("Finally removing group " + group);
+                // useless because Android deletes group memberships as soon as a group is set to DELETED:
+                // group.markMembersDirty();
+                group.delete();
+            }
+
+            // groups with DIRTY=1: mark all memberships as dirty, then clean DIRTY flag of group
+            for (LocalGroup group : addressBook.getDirtyGroups()) {
+                App.log.fine("Marking members of modified group " + group + " as dirty");
+                group.markMembersDirty();
+                group.clearDirty(null);
+            }
+        } else {
+            /* groups as separate VCards: there are group contacts and individual contacts */
+
+            // mark groups with changed members as dirty
+            BatchOperation batch = new BatchOperation(addressBook.provider);
+            for (LocalContact contact : addressBook.getDirtyContacts())
+                try {
+                    App.log.fine("Looking for changed group memberships of contact " + contact.getFileName());
+                    Set<Long>   cachedGroups = contact.getCachedGroupMemberships(),
+                                currentGroups = contact.getGroupMemberships();
+                    for (Long groupID : SetUtils.disjunction(cachedGroups, currentGroups)) {
+                        App.log.fine("Marking group as dirty: " + groupID);
+                        batch.enqueue(new BatchOperation.Operation(
+                                ContentProviderOperation.newUpdate(addressBook.syncAdapterURI(ContentUris.withAppendedId(Groups.CONTENT_URI, groupID)))
+                                .withValue(Groups.DIRTY, 1)
+                                .withYieldAllowed(true)
+                        ));
+                    }
+                } catch(FileNotFoundException ignored) {
+                }
+            batch.commit();
+        }
+    }
+
+    @Override
+    protected RequestBody prepareUpload(@NonNull LocalResource resource) throws IOException, ContactsStorageException {
+        final Contact contact;
+        if (resource instanceof LocalContact) {
+            LocalContact local = ((LocalContact)resource);
+            contact = local.getContact();
+
+            if (groupMethod == GroupMethod.CATEGORIES) {
+                // add groups as CATEGORIES
+                for (long groupID : local.getGroupMemberships()) {
+                    try {
+                        @Cleanup Cursor c = provider.query(
+                                localAddressBook().syncAdapterURI(ContentUris.withAppendedId(Groups.CONTENT_URI, groupID)),
+                                new String[] { Groups.TITLE },
+                                null, null,
+                                null
+                        );
+                        if (c != null && c.moveToNext()) {
+                            String title = c.getString(0);
+                            if (!TextUtils.isEmpty(title))
+                                contact.categories.add(title);
+                        }
+                    } catch(RemoteException e) {
+                        throw new ContactsStorageException("Couldn't find group for adding CATEGORIES", e);
+                    }
+                }
+            }
+        } else if (resource instanceof LocalGroup)
+            contact = ((LocalGroup)resource).getContact();
+        else
+            throw new IllegalArgumentException("Argument must be LocalContact or LocalGroup");
+
+        App.log.log(Level.FINE, "Preparing upload of VCard " + resource.getFileName(), contact);
+
+        ByteArrayOutputStream os = new ByteArrayOutputStream();
+        contact.write(hasVCard4 ? VCardVersion.V4_0 : VCardVersion.V3_0, groupMethod, os);
+
         return RequestBody.create(
                 hasVCard4 ? DavAddressBook.MIME_VCARD4 : DavAddressBook.MIME_VCARD3_UTF8,
-                local.getContact().toStream(hasVCard4 ? VCardVersion.V4_0 : VCardVersion.V3_0).toByteArray()
+                os.toByteArray()
         );
     }
 
     @Override
     protected void listRemote() throws IOException, HttpException, DavException {
         // fetch list of remote VCards and build hash table to index file name
-
-        try {
-            davAddressBook().addressbookQuery();
-        } catch(HttpException e) {
-            /*  non-successful responses to CARDDAV:addressbook-query with empty filter, tested on 2015/10/21
-             *  fastmail.com                 403 Forbidden (DAV:error CARDDAV:supported-filter)
-             *  mailbox.org (OpenXchange)    400 Bad Request
-             *  SOGo                         207 Multi-status, but without entries       http://www.sogo.nu/bugs/view.php?id=3370
-             *  Zimbra ZCS                   500 Server Error                            https://bugzilla.zimbra.com/show_bug.cgi?id=101902
-             */
-            if (e.status == 400 || e.status == 403 || e.status == 500 || e.status == 501) {
-                App.log.log(Level.WARNING, "Server error on REPORT addressbook-query, falling back to PROPFIND", e);
-                davAddressBook().propfind(1, GetETag.NAME);
-            } else
-                // no defined fallback, pass through exception
-                throw e;
-        }
+        davAddressBook().propfind(1, ResourceType.NAME, GetETag.NAME);
 
         remoteResources = new HashMap<>(davCollection.members.size());
         for (DavResource vCard : davCollection.members) {
+            // ignore member collections
+            ResourceType type = (ResourceType)vCard.properties.get(ResourceType.NAME);
+            if (type != null && type.types.contains(ResourceType.COLLECTION))
+                continue;
+
             String fileName = vCard.fileName();
             App.log.fine("Found remote VCard: " + fileName);
             remoteResources.put(fileName, vCard);
@@ -169,7 +304,11 @@ public class ContactsSyncManager extends SyncManager {
                 DavResource remote = bunch[0];
 
                 ResponseBody body = remote.get("text/vcard;version=4.0, text/vcard;charset=utf-8;q=0.8, text/vcard;q=0.5");
-                String eTag = ((GetETag) remote.properties.get(GetETag.NAME)).eTag;
+
+                // CardDAV servers MUST return ETag on GET [https://tools.ietf.org/html/rfc6352#section-6.3.2.3]
+                GetETag eTag = (GetETag)remote.properties.get(GetETag.NAME);
+                if (eTag == null || StringUtils.isEmpty(eTag.eTag))
+                    throw new DavException("Received CardDAV GET response without ETag for " + remote.location);
 
                 Charset charset = Charsets.UTF_8;
                 MediaType contentType = body.contentType();
@@ -177,7 +316,7 @@ public class ContactsSyncManager extends SyncManager {
                     charset = contentType.charset(Charsets.UTF_8);
 
                 @Cleanup InputStream stream = body.byteStream();
-                processVCard(remote.fileName(), eTag, stream, charset, downloader);
+                processVCard(remote.fileName(), eTag.eTag, stream, charset, downloader);
 
             } else {
                 // multiple contacts, use multi-get
@@ -189,21 +328,21 @@ public class ContactsSyncManager extends SyncManager {
                 // process multiget results
                 for (DavResource remote : davCollection.members) {
                     String eTag;
-                    GetETag getETag = (GetETag) remote.properties.get(GetETag.NAME);
+                    GetETag getETag = (GetETag)remote.properties.get(GetETag.NAME);
                     if (getETag != null)
                         eTag = getETag.eTag;
                     else
                         throw new DavException("Received multi-get response without ETag");
 
                     Charset charset = Charsets.UTF_8;
-                    GetContentType getContentType = (GetContentType) remote.properties.get(GetContentType.NAME);
+                    GetContentType getContentType = (GetContentType)remote.properties.get(GetContentType.NAME);
                     if (getContentType != null && getContentType.type != null) {
                         MediaType type = MediaType.parse(getContentType.type);
                         if (type != null)
                             charset = type.charset(Charsets.UTF_8);
                     }
 
-                    AddressData addressData = (AddressData) remote.properties.get(AddressData.NAME);
+                    AddressData addressData = (AddressData)remote.properties.get(AddressData.NAME);
                     if (addressData == null || addressData.vCard == null)
                         throw new DavException("Received multi-get response without address data");
 
@@ -214,6 +353,22 @@ public class ContactsSyncManager extends SyncManager {
         }
     }
 
+    @Override
+    protected void postProcess() throws CalendarStorageException, ContactsStorageException {
+        if (groupMethod == GroupMethod.CATEGORIES) {
+            /* VCard3 group handling: groups memberships are represented as contact CATEGORIES */
+
+            // remove empty groups
+            App.log.info("Removing empty groups");
+            localAddressBook().removeEmptyGroups();
+
+        } else {
+            /* VCard4 group handling: there are group contacts and individual contacts */
+            App.log.info("Assigning memberships of downloaded contact groups");
+            LocalGroup.applyPendingMemberships(localAddressBook());
+        }
+    }
+
     @Override
     protected void saveSyncState() throws CalendarStorageException, ContactsStorageException {
         super.saveSyncState();
@@ -226,48 +381,85 @@ public class ContactsSyncManager extends SyncManager {
     private DavAddressBook davAddressBook() { return (DavAddressBook)davCollection; }
     private LocalAddressBook localAddressBook() { return (LocalAddressBook)localCollection; }
 
-    private void processChangedGroups() throws ContactsStorageException {
-        LocalAddressBook addressBook = localAddressBook();
-
-        // groups with DELETED=1: remove group finally
-        for (LocalGroup group : addressBook.getDeletedGroups()) {
-            long groupId = group.getId();
-            App.log.fine("Finally removing group #" + groupId);
-            // remove group memberships, but not as sync adapter (should marks contacts as DIRTY)
-            // NOTE: doesn't work that way because Contact Provider removes the group memberships even for DELETED groups
-            // addressBook.removeGroupMemberships(groupId, false);
-            group.delete();
-        }
-
-        // groups with DIRTY=1: mark all memberships as dirty, then clean DIRTY flag of group
-        for (LocalGroup group : addressBook.getDirtyGroups()) {
-            long groupId = group.getId();
-            App.log.fine("Marking members of modified group #" + groupId + " as dirty");
-            addressBook.markMembersDirty(groupId);
-            group.clearDirty();
-        }
-    }
-
     private void processVCard(String fileName, String eTag, InputStream stream, Charset charset, Contact.Downloader downloader) throws IOException, ContactsStorageException {
+        App.log.info("Processing CardDAV resource " + fileName);
         Contact[] contacts = Contact.fromStream(stream, charset, downloader);
-        if (contacts.length == 1) {
-            Contact newData = contacts[0];
+        if (contacts.length == 0) {
+            App.log.warning("Received VCard without data, ignoring");
+            return;
+        } else if (contacts.length > 1)
+            App.log.warning("Received multiple VCards, using first one");
 
-            // update local contact, if it exists
-            LocalContact localContact = (LocalContact)localResources.get(fileName);
-            if (localContact != null) {
-                App.log.info("Updating " + fileName + " in local address book");
-                localContact.eTag = eTag;
-                localContact.update(newData);
+        final Contact newData = contacts[0];
+
+        if (groupMethod == GroupMethod.CATEGORIES && newData.group) {
+            groupMethod = GroupMethod.GROUP_VCARDS;
+            App.log.warning("Received group VCard although group method is CATEGORIES. Deleting all groups; new group method: " + groupMethod);
+            localAddressBook().removeGroups();
+            settings.setGroupMethod(groupMethod);
+        }
+
+        // update local contact, if it exists
+        LocalResource local = localResources.get(fileName);
+        if (local != null) {
+            App.log.log(Level.INFO, "Updating " + fileName + " in local address book", newData);
+
+            if (local instanceof LocalGroup && newData.group) {
+                // update group
+                LocalGroup group = (LocalGroup)local;
+                group.eTag = eTag;
+                group.updateFromServer(newData);
                 syncResult.stats.numUpdates++;
+
+            } else if (local instanceof LocalContact && !newData.group) {
+                // update contact
+                LocalContact contact = (LocalContact)local;
+                contact.eTag = eTag;
+                contact.update(newData);
+                syncResult.stats.numUpdates++;
+
             } else {
-                App.log.info("Adding " + fileName + " to local address book");
-                localContact = new LocalContact(localAddressBook(), newData, fileName, eTag);
-                localContact.add();
-                syncResult.stats.numInserts++;
+                // group has become an individual contact or vice versa
+                try {
+                    local.delete();
+                    local = null;
+                } catch(CalendarStorageException e) {
+                    // CalendarStorageException is not used by LocalGroup and LocalContact
+                }
             }
-        } else
-            App.log.severe("Received VCard with not exactly one VCARD, ignoring " + fileName);
+        }
+
+        if (local == null) {
+            if (newData.group) {
+                App.log.log(Level.INFO, "Creating local group", newData);
+                LocalGroup group = new LocalGroup(localAddressBook(), newData, fileName, eTag);
+                group.create();
+
+                local = group;
+            } else {
+                App.log.log(Level.INFO, "Creating local contact", newData);
+                LocalContact contact = new LocalContact(localAddressBook(), newData, fileName, eTag);
+                contact.create();
+
+                local = contact;
+            }
+            syncResult.stats.numInserts++;
+        }
+
+        if (groupMethod == GroupMethod.CATEGORIES && local instanceof LocalContact) {
+            // VCard3: update group memberships from CATEGORIES
+            LocalContact contact = (LocalContact)local;
+
+            BatchOperation batch = new BatchOperation(provider);
+            contact.removeGroupMemberships(batch);
+
+            for (String category : contact.getContact().categories) {
+                long groupID = localAddressBook().findOrCreateGroup(category);
+                contact.addToGroup(batch, groupID);
+            }
+
+            batch.commit();
+        }
     }
 
 
@@ -292,7 +484,7 @@ public class ContactsSyncManager extends SyncManager {
                 return null;
             }
 
-            OkHttpClient resourceClient = HttpClient.create();
+            OkHttpClient resourceClient = HttpClient.create(context);
 
             // authenticate only against a certain host, and only upon request
             resourceClient = HttpClient.addAuthentication(resourceClient, baseUrl.host(), settings.username(), settings.password());

app/src/main/java/at/bitfire/davdroid/syncadapter/ISyncPlugin.java

@@ -0,0 +1,11 @@
+package at.bitfire.davdroid.syncadapter;
+
+import android.content.Context;
+import android.support.annotation.NonNull;
+
+interface ISyncPlugin {
+
+    boolean beforeSync(@NonNull Context context);
+    void afterSync(@NonNull Context context);
+
+}

app/src/main/java/at/bitfire/davdroid/syncadapter/SyncAdapterService.java

@@ -9,68 +9,134 @@
 package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
+import android.app.Notification;
+import android.app.PendingIntent;
 import android.app.Service;
 import android.content.AbstractThreadedSyncAdapter;
 import android.content.ContentProviderClient;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SyncResult;
-import android.database.sqlite.SQLiteDatabase;
+import android.net.ConnectivityManager;
+import android.net.NetworkInfo;
+import android.net.wifi.WifiInfo;
+import android.net.wifi.WifiManager;
 import android.os.Bundle;
 import android.os.IBinder;
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
+import android.support.v4.app.NotificationCompat;
+import android.support.v4.app.NotificationManagerCompat;
 
+import org.apache.commons.collections4.IteratorUtils;
+
+import java.util.List;
+import java.util.ServiceLoader;
 import java.util.logging.Level;
 
 import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
-import at.bitfire.davdroid.InvalidAccountException;
-import at.bitfire.davdroid.model.ServiceDB;
+import at.bitfire.davdroid.Constants;
+import at.bitfire.davdroid.R;
+import at.bitfire.davdroid.ui.PermissionsActivity;
+
+//import com.android.vending.billing.IInAppBillingService;
 
 public abstract class SyncAdapterService extends Service {
 
-    ServiceDB.OpenHelper dbHelper;
-    AbstractThreadedSyncAdapter syncAdapter;
-
-    @Override
-    public void onCreate() {
-        dbHelper = new ServiceDB.OpenHelper(this);
-    }
-
-    @Override
-    public void onDestroy() {
-        dbHelper.close();
-    }
+    abstract protected AbstractThreadedSyncAdapter syncAdapter();
 
     @Nullable
     @Override
     public IBinder onBind(Intent intent) {
-        return syncAdapter.getSyncAdapterBinder();
+        return syncAdapter().getSyncAdapterBinder();
     }
 
 
     public static abstract class SyncAdapter extends AbstractThreadedSyncAdapter {
-        protected final SQLiteDatabase db;
 
-        public SyncAdapter(Context context, ServiceDB.OpenHelper dbHelper) {
+        private static final ServiceLoader<ISyncPlugin> syncPluginLoader = ServiceLoader.load(ISyncPlugin.class);
+        private final List<ISyncPlugin> syncPlugins = IteratorUtils.toList(syncPluginLoader.iterator());
+
+
+        public SyncAdapter(Context context) {
             super(context, false);
-            db = dbHelper.getReadableDatabase();
+
+            for (ISyncPlugin plugin : syncPlugins)
+                App.log.info("Registered sync plugin: " + plugin.getClass().getName());
         }
 
+        abstract void sync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult);
+
         @Override
         public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient provider, SyncResult syncResult) {
-            App.log.info("Starting " + authority + " sync");
+            App.log.info("Sync for " + authority + " has been initiated");
 
             // required for dav4android (ServiceLoader)
-            Thread.currentThread().setContextClassLoader(getContext().getClassLoader());
+            final Context context = getContext();
+            Thread.currentThread().setContextClassLoader(context.getClassLoader());
 
-            // peek into AccountSettings to cause possible migration (v0.9 -> v1.0)
-            try {
-                new AccountSettings(getContext(), account);
-            } catch (InvalidAccountException e) {
-                App.log.log(Level.SEVERE, "Couldn't check for updated account settings", e);
-            }
+            boolean runSync = true;
+            for (ISyncPlugin plugin : syncPlugins)
+                if (!plugin.beforeSync(context))
+                    runSync = false;
+
+            if (runSync)
+                sync(account, extras, authority, provider, syncResult);
+
+            for (ISyncPlugin plugin : syncPlugins)
+                plugin.afterSync(context);
+
+            App.log.info("Sync for " + authority + " complete");
         }
+
+        @Override
+        public void onSecurityException(Account account, Bundle extras, String authority, SyncResult syncResult) {
+            App.log.log(Level.WARNING, "Security exception when opening content provider for " +  authority);
+            syncResult.databaseError = true;
+
+            Intent intent = new Intent(getContext(), PermissionsActivity.class);
+            intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
+
+            Notification notify = new NotificationCompat.Builder(getContext())
+                    .setSmallIcon(R.drawable.ic_error_light)
+                    .setLargeIcon(App.getLauncherBitmap(getContext()))
+                    .setContentTitle(getContext().getString(R.string.sync_error_permissions))
+                    .setContentText(getContext().getString(R.string.sync_error_permissions_text))
+                    .setContentIntent(PendingIntent.getActivity(getContext(), 0, intent, PendingIntent.FLAG_CANCEL_CURRENT))
+                    .setCategory(NotificationCompat.CATEGORY_ERROR)
+                    .build();
+            NotificationManagerCompat nm = NotificationManagerCompat.from(getContext());
+            nm.notify(Constants.NOTIFICATION_PERMISSIONS, notify);
+        }
+
+        protected boolean checkSyncConditions(@NonNull AccountSettings settings) {
+            if (settings.getSyncWifiOnly()) {
+                ConnectivityManager cm = (ConnectivityManager)getContext().getSystemService(CONNECTIVITY_SERVICE);
+                NetworkInfo network = cm.getActiveNetworkInfo();
+                if (network == null) {
+                    App.log.info("No network available, stopping");
+                    return false;
+                }
+                if (network.getType() != ConnectivityManager.TYPE_WIFI || !network.isConnected()) {
+                    App.log.info("Not on connected WiFi, stopping");
+                    return false;
+                }
+
+                String onlySSID = settings.getSyncWifiOnlySSID();
+                if (onlySSID != null) {
+                    onlySSID = "\"" + onlySSID + "\"";
+                    WifiManager wifi = (WifiManager)getContext().getSystemService(WIFI_SERVICE);
+                    WifiInfo info = wifi.getConnectionInfo();
+                    if (info == null || !onlySSID.equals(info.getSSID())) {
+                        App.log.info("Connected to wrong WiFi network (" + info.getSSID() + ", required: " + onlySSID + "), ignoring");
+                        return false;
+                    }
+                }
+            }
+            return true;
+        }
+
     }
 
 }

app/src/main/java/at/bitfire/davdroid/syncadapter/SyncManager.java

@@ -9,15 +9,14 @@ package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
 import android.annotation.TargetApi;
-import android.app.Notification;
-import android.app.NotificationManager;
 import android.app.PendingIntent;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SyncResult;
-import android.os.Build;
+import android.net.Uri;
 import android.os.Bundle;
+import android.support.v4.app.NotificationManagerCompat;
 import android.support.v7.app.NotificationCompat;
 import android.text.TextUtils;
 
@@ -46,7 +45,6 @@ import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.resource.LocalCollection;
 import at.bitfire.davdroid.resource.LocalResource;
-import at.bitfire.davdroid.ui.AccountActivity;
 import at.bitfire.davdroid.ui.AccountSettingsActivity;
 import at.bitfire.davdroid.ui.DebugInfoActivity;
 import at.bitfire.ical4android.CalendarStorageException;
@@ -67,10 +65,11 @@ abstract public class SyncManager {
                         SYNC_PHASE_LIST_REMOTE = 7,
                         SYNC_PHASE_COMPARE_LOCAL_REMOTE = 8,
                         SYNC_PHASE_DOWNLOAD_REMOTE = 9,
-                        SYNC_PHASE_SAVE_SYNC_STATE = 10;
+                        SYNC_PHASE_POST_PROCESSING = 10,
+                        SYNC_PHASE_SAVE_SYNC_STATE = 11;
 
-    protected final NotificationManager notificationManager;
-    protected final int notificationId;
+    protected final NotificationManagerCompat notificationManager;
+    protected final String uniqueCollectionId;
 
     protected final Context context;
     protected final Account account;
@@ -100,24 +99,24 @@ abstract public class SyncManager {
 
 
 
-    public SyncManager(int notificationId, Context context, Account account, Bundle extras, String authority, SyncResult syncResult) throws InvalidAccountException {
+    public SyncManager(Context context, Account account, AccountSettings settings, Bundle extras, String authority, SyncResult syncResult, String uniqueCollectionId) throws InvalidAccountException {
         this.context = context;
         this.account = account;
+        this.settings = settings;
         this.extras = extras;
         this.authority = authority;
         this.syncResult = syncResult;
 
-        // get account settings (for sync interval etc.)
-        settings = new AccountSettings(context, account);
-
         // create HttpClient with given logger
         httpClient = HttpClient.create(context, account);
 
         // dismiss previous error notifications
-        notificationManager = (NotificationManager)context.getSystemService(Context.NOTIFICATION_SERVICE);
-        notificationManager.cancel(account.name, this.notificationId = notificationId);
+        this.uniqueCollectionId = uniqueCollectionId;
+        notificationManager = NotificationManagerCompat.from(context);
+        notificationManager.cancel(uniqueCollectionId, notificationId());
     }
 
+    protected abstract int notificationId();
     protected abstract String getSyncErrorTitle();
 
     @TargetApi(21)
@@ -170,6 +169,10 @@ abstract public class SyncManager {
                 App.log.info("Downloading remote entries");
                 downloadRemote();
 
+                syncPhase = SYNC_PHASE_POST_PROCESSING;
+                App.log.info("Post-processing");
+                postProcess();
+
                 syncPhase = SYNC_PHASE_SAVE_SYNC_STATE;
                 App.log.info("Saving sync state");
                 saveSyncState();
@@ -188,7 +191,7 @@ abstract public class SyncManager {
                 }
             }
 
-        } catch(Exception e) {
+        } catch(Exception|OutOfMemoryError e) {
             final int messageString;
 
             if (e instanceof UnauthorizedException) {
@@ -215,18 +218,21 @@ abstract public class SyncManager {
                 detailsIntent.putExtra(AccountSettingsActivity.EXTRA_ACCOUNT, account);
             } else {
                 detailsIntent = new Intent(context, DebugInfoActivity.class);
-                detailsIntent.putExtra(DebugInfoActivity.KEY_EXCEPTION, e);
+                detailsIntent.putExtra(DebugInfoActivity.KEY_THROWABLE, e);
                 detailsIntent.putExtra(DebugInfoActivity.KEY_ACCOUNT, account);
                 detailsIntent.putExtra(DebugInfoActivity.KEY_AUTHORITY, authority);
                 detailsIntent.putExtra(DebugInfoActivity.KEY_PHASE, syncPhase);
             }
 
+            // to make the PendingIntent unique
+            detailsIntent.setData(Uri.parse("uri://" + getClass().getName() + "/" + uniqueCollectionId));
+
             NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
-            builder .setSmallIcon(R.drawable.ic_launcher)
+            builder .setSmallIcon(R.drawable.ic_error_light)
+                    .setLargeIcon(App.getLauncherBitmap(context))
                     .setContentTitle(getSyncErrorTitle())
-                    .setContentIntent(PendingIntent.getActivity(context, notificationId, detailsIntent, PendingIntent.FLAG_UPDATE_CURRENT))
-                    .setCategory(NotificationCompat.CATEGORY_ERROR)
-                    .setLocalOnly(true);
+                    .setContentIntent(PendingIntent.getActivity(context, 0, detailsIntent, PendingIntent.FLAG_CANCEL_CURRENT))
+                    .setCategory(NotificationCompat.CATEGORY_ERROR);
 
             try {
                 String[] phases = context.getResources().getStringArray(R.array.sync_error_phases);
@@ -236,7 +242,7 @@ abstract public class SyncManager {
                 // should never happen
             }
 
-            notificationManager.notify(account.name, notificationId, builder.build());
+            notificationManager.notify(uniqueCollectionId, notificationId(), builder.build());
         }
     }
 
@@ -275,9 +281,10 @@ abstract public class SyncManager {
 
     protected void prepareDirty() throws CalendarStorageException, ContactsStorageException {
         // assign file names and UIDs to new contacts so that we can use the file name as an index
+        App.log.info("Looking for contacts/groups without file name");
         for (LocalResource local : localCollection.getWithoutFileName()) {
             String uuid = UUID.randomUUID().toString();
-            App.log.info("Found local record #" + local.getId() + " without file name; assigning file name/UID based on " + uuid);
+            App.log.fine("Found local record #" + local.getId() + " without file name; assigning file name/UID based on " + uuid);
             local.updateFileNameAndUID(uuid);
         }
     }
@@ -302,7 +309,6 @@ abstract public class SyncManager {
             RequestBody body = prepareUpload(local);
 
             try {
-
                 if (local.getETag() == null) {
                     App.log.info("Uploading new record " + fileName);
                     remote.put(body, null, true);
@@ -310,7 +316,6 @@ abstract public class SyncManager {
                     App.log.info("Uploading locally modified record " + fileName);
                     remote.put(body, local.getETag(), false);
                 }
-
             } catch (ConflictException|PreconditionFailedException e) {
                 // we can't interact with the user to resolve the conflict, so we treat 409 like 412
                 App.log.log(Level.INFO, "Resource has been modified on the server before upload, ignoring", e);
@@ -424,6 +429,12 @@ abstract public class SyncManager {
      */
     abstract protected void downloadRemote() throws IOException, HttpException, DavException, ContactsStorageException, CalendarStorageException;
 
+    /**
+     * For post-processing of entries, for instance assigning groups.
+     */
+    protected void postProcess() throws CalendarStorageException, ContactsStorageException {
+    }
+
     protected void saveSyncState() throws CalendarStorageException, ContactsStorageException {
         /* Save sync state (CTag). It doesn't matter if it has changed during the sync process
            (for instance, because another client has uploaded changes), because this will simply

app/src/main/java/at/bitfire/davdroid/syncadapter/TasksSyncAdapterService.java

@@ -8,124 +8,143 @@
 package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
-import android.app.Service;
 import android.content.AbstractThreadedSyncAdapter;
 import android.content.ContentProviderClient;
+import android.content.ContentResolver;
 import android.content.ContentValues;
 import android.content.Context;
-import android.content.Intent;
 import android.content.SyncResult;
 import android.database.Cursor;
 import android.database.DatabaseUtils;
 import android.database.sqlite.SQLiteDatabase;
+import android.database.sqlite.SQLiteOpenHelper;
 import android.os.Bundle;
-import android.os.IBinder;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+
+import org.dmfs.provider.tasks.TaskContract;
 
 import java.util.LinkedHashMap;
 import java.util.Map;
 import java.util.logging.Level;
 
+import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.model.CollectionInfo;
+import at.bitfire.davdroid.model.ServiceDB;
 import at.bitfire.davdroid.model.ServiceDB.Collections;
-import at.bitfire.davdroid.model.ServiceDB.OpenHelper;
 import at.bitfire.davdroid.model.ServiceDB.Services;
 import at.bitfire.davdroid.resource.LocalTaskList;
 import at.bitfire.ical4android.CalendarStorageException;
 import at.bitfire.ical4android.TaskProvider;
 import lombok.Cleanup;
 
+/**
+ * Synchronization manager for CalDAV collections; handles tasks ({@code VTODO}).
+ */
 public class TasksSyncAdapterService extends SyncAdapterService {
 
-	@Override
-	public void onCreate() {
-        super.onCreate();
-        syncAdapter = new SyncAdapter(this, dbHelper);
-	}
+    @Override
+    protected AbstractThreadedSyncAdapter syncAdapter() {
+        return new SyncAdapter(this);
+    }
 
 
 	private static class SyncAdapter extends SyncAdapterService.SyncAdapter {
 
-        public SyncAdapter(Context context, OpenHelper dbHelper) {
-            super(context, dbHelper);
+        public SyncAdapter(Context context) {
+            super(context);
         }
 
         @Override
-        public void onPerformSync(Account account, Bundle extras, String authority, ContentProviderClient providerClient, SyncResult syncResult) {
-            super.onPerformSync(account, extras, authority, providerClient, syncResult);
-
+        public void sync(Account account, Bundle extras, String authority, ContentProviderClient providerClient, SyncResult syncResult) {
             try {
                 @Cleanup TaskProvider provider = TaskProvider.acquire(getContext().getContentResolver(), TaskProvider.ProviderName.OpenTasks);
                 if (provider == null)
                     throw new CalendarStorageException("Couldn't access OpenTasks provider");
 
-                updateLocalTaskLists(provider, account);
+                AccountSettings settings = new AccountSettings(getContext(), account);
+                if (!extras.containsKey(ContentResolver.SYNC_EXTRAS_MANUAL) && !checkSyncConditions(settings))
+                    return;
 
-                for (LocalTaskList taskList : (LocalTaskList[])LocalTaskList.find(account, provider, LocalTaskList.Factory.INSTANCE, null, null)) {
-                    App.log.info("Synchronizing task list #"  + taskList.getId() + ", URL: " + taskList.getSyncId());
-                    TasksSyncManager syncManager = new TasksSyncManager(getContext(), account, extras, authority, provider, syncResult, taskList);
+                updateLocalTaskLists(provider, account, settings);
+
+                for (LocalTaskList taskList : (LocalTaskList[])LocalTaskList.find(account, provider, LocalTaskList.Factory.INSTANCE, TaskContract.TaskLists.SYNC_ENABLED + "!=0", null)) {
+                    App.log.info("Synchronizing task list #" + taskList.getId() + " [" + taskList.getSyncId() + "]");
+                    TasksSyncManager syncManager = new TasksSyncManager(getContext(), account, settings, extras, authority, provider, syncResult, taskList);
                     syncManager.performSync();
                 }
             } catch (CalendarStorageException e) {
                 App.log.log(Level.SEVERE, "Couldn't enumerate local task lists", e);
             } catch (InvalidAccountException e) {
                 App.log.log(Level.SEVERE, "Couldn't get account settings", e);
-            } finally {
-                db.close();
             }
 
             App.log.info("Task sync complete");
         }
 
-        private void updateLocalTaskLists(TaskProvider provider, Account account) throws CalendarStorageException {
-            long service = getService(account);
+        private void updateLocalTaskLists(TaskProvider provider, Account account, AccountSettings settings) throws CalendarStorageException {
+            SQLiteOpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
+            try {
+                // enumerate remote and local task lists
+                SQLiteDatabase db = dbHelper.getReadableDatabase();
+                Long service = getService(db, account);
+                Map<String, CollectionInfo> remote = remoteTaskLists(db, service);
+                LocalTaskList[] local = (LocalTaskList[])LocalTaskList.find(account, provider, LocalTaskList.Factory.INSTANCE, null, null);
 
-            // enumerate remote and local task lists
-            Map<String, CollectionInfo> remote = remoteTaskLists(service);
-            LocalTaskList[] local = (LocalTaskList[])LocalTaskList.find(account, provider, LocalTaskList.Factory.INSTANCE, null, null);
+                boolean updateColors = settings.getManageCalendarColors();
 
-            // delete obsolete local task lists
-            for (LocalTaskList list : local) {
-                String url = list.getSyncId();
-                if (!remote.containsKey(url)) {
-                    App.log.fine("Deleting obsolete local task list" + url);
-                    list.delete();
-                } else {
-                    // remote CollectionInfo found for this local collection, update data
-                    CollectionInfo info = remote.get(url);
-                    App.log.fine("Updating local task list " + url + " with " + info);
-                    list.update(info);
-                    // we already have a local task list for this remote collection, don't take into consideration anymore
-                    remote.remove(url);
+                // delete obsolete local task lists
+                for (LocalTaskList list : local) {
+                    String url = list.getSyncId();
+                    if (!remote.containsKey(url)) {
+                        App.log.fine("Deleting obsolete local task list" + url);
+                        list.delete();
+                    } else {
+                        // remote CollectionInfo found for this local collection, update data
+                        CollectionInfo info = remote.get(url);
+                        App.log.fine("Updating local task list " + url + " with " + info);
+                        list.update(info, updateColors);
+                        // we already have a local task list for this remote collection, don't take into consideration anymore
+                        remote.remove(url);
+                    }
                 }
-            }
 
-            // create new local task lists
-            for (String url : remote.keySet()) {
-                CollectionInfo info = remote.get(url);
-                App.log.info("Adding local task list " + info);
-                LocalTaskList.create(account, provider, info);
+                // create new local task lists
+                for (String url : remote.keySet()) {
+                    CollectionInfo info = remote.get(url);
+                    App.log.info("Adding local task list " + info);
+                    LocalTaskList.create(account, provider, info);
+                }
+            } finally {
+                dbHelper.close();
             }
         }
 
-        long getService(Account account) {
-            @Cleanup Cursor c = db.query(Services._TABLE, new String[]{ Services.ID },
+        @Nullable
+        Long getService(@NonNull SQLiteDatabase db, @NonNull Account account) {
+            @Cleanup Cursor c = db.query(Services._TABLE, new String[] { Services.ID },
                     Services.ACCOUNT_NAME + "=? AND " + Services.SERVICE + "=?", new String[] { account.name, Services.SERVICE_CALDAV }, null, null, null);
-            c.moveToNext();
-            return c.getLong(0);
+            if (c.moveToNext())
+                return c.getLong(0);
+            else
+                return null;
         }
 
-        private Map<String, CollectionInfo> remoteTaskLists(long service) {
+        @NonNull
+        private Map<String, CollectionInfo> remoteTaskLists(@NonNull SQLiteDatabase db, Long service) {
             Map<String, CollectionInfo> collections = new LinkedHashMap<>();
-            @Cleanup Cursor cursor = db.query(Collections._TABLE, null,
-                    Collections.SERVICE_ID + "=? AND " + Collections.SUPPORTS_VTODO + "!=0 AND " + Collections.SYNC,
-                    new String[] { String.valueOf(service) }, null, null, null);
-            while (cursor.moveToNext()) {
-                ContentValues values = new ContentValues();
-                DatabaseUtils.cursorRowToContentValues(cursor, values);
-                CollectionInfo info = CollectionInfo.fromDB(values);
-                collections.put(info.url, info);
+            if (service != null) {
+                @Cleanup Cursor cursor = db.query(Collections._TABLE, null,
+                        Collections.SERVICE_ID + "=? AND " + Collections.SUPPORTS_VTODO + "!=0 AND " + Collections.SYNC,
+                        new String[] { String.valueOf(service) }, null, null, null);
+                while (cursor.moveToNext()) {
+                    ContentValues values = new ContentValues();
+                    DatabaseUtils.cursorRowToContentValues(cursor, values);
+                    CollectionInfo info = CollectionInfo.fromDB(values);
+                    collections.put(info.url, info);
+                }
             }
             return collections;
         }

app/src/main/java/at/bitfire/davdroid/syncadapter/TasksSyncManager.java

@@ -9,22 +9,18 @@
 package at.bitfire.davdroid.syncadapter;
 
 import android.accounts.Account;
-import android.content.ContentValues;
 import android.content.Context;
 import android.content.SyncResult;
 import android.os.Bundle;
-import android.text.TextUtils;
 
 import org.apache.commons.codec.Charsets;
 import org.apache.commons.lang3.StringUtils;
-import org.dmfs.provider.tasks.TaskContract.TaskLists;
 
 import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.InputStream;
 import java.nio.charset.Charset;
-import java.util.Calendar;
-import java.util.Date;
 import java.util.HashMap;
 import java.util.LinkedList;
 import java.util.List;
@@ -34,12 +30,11 @@ import at.bitfire.dav4android.DavCalendar;
 import at.bitfire.dav4android.DavResource;
 import at.bitfire.dav4android.exception.DavException;
 import at.bitfire.dav4android.exception.HttpException;
-import at.bitfire.dav4android.property.CalendarColor;
 import at.bitfire.dav4android.property.CalendarData;
-import at.bitfire.dav4android.property.DisplayName;
 import at.bitfire.dav4android.property.GetCTag;
 import at.bitfire.dav4android.property.GetContentType;
 import at.bitfire.dav4android.property.GetETag;
+import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.ArrayUtils;
 import at.bitfire.davdroid.Constants;
@@ -65,12 +60,17 @@ public class TasksSyncManager extends SyncManager {
     final protected TaskProvider provider;
 
 
-    public TasksSyncManager(Context context, Account account, Bundle extras, String authority, TaskProvider provider, SyncResult result, LocalTaskList taskList) throws InvalidAccountException {
-        super(Constants.NOTIFICATION_TASK_SYNC, context, account, extras, authority, result);
+    public TasksSyncManager(Context context, Account account, AccountSettings settings, Bundle extras, String authority, TaskProvider provider, SyncResult result, LocalTaskList taskList) throws InvalidAccountException {
+        super(context, account, settings, extras, authority, result, "taskList/" + taskList.getId());
         this.provider = provider;
         localCollection = taskList;
     }
 
+    @Override
+    protected int notificationId() {
+        return Constants.NOTIFICATION_TASK_SYNC;
+    }
+
     @Override
     protected String getSyncErrorTitle() {
         return context.getString(R.string.sync_error_tasks, account.name);
@@ -91,9 +91,14 @@ public class TasksSyncManager extends SyncManager {
     @Override
     protected RequestBody prepareUpload(LocalResource resource) throws IOException, CalendarStorageException {
         LocalTask local = (LocalTask)resource;
+        App.log.log(Level.FINE, "Preparing upload of task " + local.getFileName(), local.getTask() );
+
+        ByteArrayOutputStream os = new ByteArrayOutputStream();
+        local.getTask().write(os);
+
         return RequestBody.create(
                 DavCalendar.MIME_ICALENDAR,
-                local.getTask().toStream().toByteArray()
+                os.toByteArray()
         );
     }
 
@@ -125,7 +130,11 @@ public class TasksSyncManager extends SyncManager {
                 DavResource remote = bunch[0];
 
                 ResponseBody body = remote.get("text/calendar");
-                String eTag = ((GetETag)remote.properties.get(GetETag.NAME)).eTag;
+
+                // CalDAV servers MUST return ETag on GET [https://tools.ietf.org/html/rfc4791#section-5.3.4]
+                GetETag eTag = (GetETag)remote.properties.get(GetETag.NAME);
+                if (eTag == null || StringUtils.isEmpty(eTag.eTag))
+                    throw new DavException("Received CalDAV GET response without ETag for " + remote.location);
 
                 Charset charset = Charsets.UTF_8;
                 MediaType contentType = body.contentType();
@@ -133,7 +142,7 @@ public class TasksSyncManager extends SyncManager {
                     charset = contentType.charset(Charsets.UTF_8);
 
                 @Cleanup InputStream stream = body.byteStream();
-                processVTodo(remote.fileName(), eTag, stream, charset);
+                processVTodo(remote.fileName(), eTag.eTag, stream, charset);
 
             } else {
                 // multiple contacts, use multi-get

app/src/main/java/at/bitfire/davdroid/ui/AboutActivity.java

@@ -64,45 +64,42 @@ public class AboutActivity extends AppCompatActivity {
 
     @RequiredArgsConstructor
     private static class ComponentInfo {
-        final String   title, version, website, copyright;
-        final int licenseInfo;
+        final String title, version, website, copyright;
+        final Integer licenseInfo;
         final String licenseTextFile;
     }
 
     private final static ComponentInfo components[] = {
             new ComponentInfo(
-                    "DAVdroid", BuildConfig.VERSION_NAME, "https://davdroid.bitfire.at",
-                    "© " + DateFormatUtils.format(BuildConfig.buildTime, "yyyy") + " Ricki Hirner, Bernhard Stockmann (bitfire web engineering)",
-                    R.string.about_license_info_no_warranty, "gpl-3.0-standalone.html"
+                    null, BuildConfig.VERSION_NAME, "https://davdroid.bitfire.at",
+                    DateFormatUtils.format(BuildConfig.buildTime, "yyyy") + " Ricki Hirner, Bernhard Stockmann (bitfire web engineering)",
+                    null, null
             ), new ComponentInfo(
                     "AmbilWarna", null, "https://github.com/yukuku/ambilwarna",
-                    "© Yuku", R.string.about_license_info_no_warranty, "apache2.html"
+                    "Yuku", R.string.about_license_info_no_warranty, "apache2.html"
             ), new ComponentInfo(
                     "Apache Commons", null, "http://commons.apache.org/",
                     "Apache Software Foundation", R.string.about_license_info_no_warranty, "apache2.html"
             ), new ComponentInfo(
                     "dnsjava", null, "http://dnsjava.org/",
-                    "© Brian Wellington", R.string.about_license_info_no_warranty, "bsd.html"
+                    "Brian Wellington", R.string.about_license_info_no_warranty, "bsd.html"
             ), new ComponentInfo(
                     "ez-vcard", Ezvcard.VERSION, "https://github.com/mangstadt/ez-vcard",
-                    "© Michael Angstadt", R.string.about_license_info_no_warranty, "bsd.html"
+                    "Michael Angstadt", R.string.about_license_info_no_warranty, "bsd.html"
             ), new ComponentInfo(
-                    "ical4j", "2.x", "http://ical4j.github.io/",
-                    "© Ben Fortuna", R.string.about_license_info_no_warranty, "bsd-3clause.html"
-            ), new ComponentInfo(
-                    "MemorizingTrustManager", null, "https://github.com/ge0rg/MemorizingTrustManager",
-                    "© Georg Lukas", R.string.about_license_info_no_warranty, "mit.html"
+                    "ical4j", "2.x", "https://ical4j.github.io/",
+                    "Ben Fortuna", R.string.about_license_info_no_warranty, "bsd-3clause.html"
             ), new ComponentInfo(
                     "OkHttp", null, "https://square.github.io/okhttp/",
-                    "© Square, Inc.", R.string.about_license_info_no_warranty, "apache2.html"
+                    "Square, Inc.", R.string.about_license_info_no_warranty, "apache2.html"
             ), new ComponentInfo(
                     "Project Lombok", null, "https://projectlombok.org/",
-                    "© The Project Lombok Authors", R.string.about_license_info_no_warranty, "mit.html"
+                    "The Project Lombok Authors", R.string.about_license_info_no_warranty, "mit.html"
             )
     };
 
 
-    private static class TabsAdapter extends FragmentPagerAdapter {
+    private class TabsAdapter extends FragmentPagerAdapter {
         public TabsAdapter(FragmentManager fm) {
             super(fm);
         }
@@ -114,7 +111,7 @@ public class AboutActivity extends AppCompatActivity {
 
         @Override
         public CharSequence getPageTitle(int position) {
-            return components[position].title;
+            return components[position].title != null ? components[position].title : getString(R.string.app_name);
         }
 
         @Override
@@ -145,22 +142,31 @@ public class AboutActivity extends AppCompatActivity {
             View v = inflater.inflate(R.layout.about_component, container, false);
 
             TextView tv = (TextView)v.findViewById(R.id.title);
-            tv.setText(info.title + (info.version != null ? (" " + info.version) : ""));
+            tv.setText((info.title == null ? getString(R.string.app_name) : info.title) +
+                    (info.version != null ? (" " + info.version) : ""));
 
             tv = (TextView)v.findViewById(R.id.website);
             tv.setAutoLinkMask(Linkify.WEB_URLS);
             tv.setText(info.website);
 
             tv = (TextView)v.findViewById(R.id.copyright);
-            tv.setText(info.copyright);
+            tv.setText("© " + info.copyright);
 
             tv = (TextView)v.findViewById(R.id.license_info);
-            tv.setText(info.licenseInfo);
+            if (info.licenseInfo == null)
+                tv.setVisibility(View.GONE);
+            else
+                tv.setText(info.licenseInfo);
 
             // load and format license text
-            Bundle args = new Bundle(1);
-            args.putString(KEY_FILE_NAME, info.licenseTextFile);
-            getLoaderManager().initLoader(0, args, this);
+            if (info.licenseTextFile == null) {
+                v.findViewById(R.id.license_header).setVisibility(View.GONE);
+                v.findViewById(R.id.license_text).setVisibility(View.GONE);
+            } else {
+                Bundle args = new Bundle(1);
+                args.putString(KEY_FILE_NAME, info.licenseTextFile);
+                getLoaderManager().initLoader(0, args, this);
+            }
 
             return v;
         }

app/src/main/java/at/bitfire/davdroid/ui/AccountActivity.java

@@ -14,6 +14,7 @@ import android.accounts.AccountManagerCallback;
 import android.accounts.AccountManagerFuture;
 import android.accounts.AuthenticatorException;
 import android.accounts.OperationCanceledException;
+import android.annotation.TargetApi;
 import android.app.LoaderManager;
 import android.content.AsyncTaskLoader;
 import android.content.ComponentName;
@@ -24,6 +25,7 @@ import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.Loader;
 import android.content.ServiceConnection;
+import android.content.SyncStatusObserver;
 import android.database.Cursor;
 import android.database.DatabaseUtils;
 import android.database.sqlite.SQLiteDatabase;
@@ -62,11 +64,9 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.logging.Level;
 
-import at.bitfire.davdroid.AccountSettings;
+import at.bitfire.cert4android.CustomCertManager;
 import at.bitfire.davdroid.App;
-import at.bitfire.davdroid.Constants;
 import at.bitfire.davdroid.DavService;
-import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.model.CollectionInfo;
 import at.bitfire.davdroid.model.ServiceDB;
@@ -76,6 +76,8 @@ import at.bitfire.davdroid.model.ServiceDB.Services;
 import at.bitfire.ical4android.TaskProvider;
 import lombok.Cleanup;
 
+import static android.content.ContentResolver.SYNC_OBSERVER_TYPE_ACTIVE;
+
 public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenuItemClickListener, PopupMenu.OnMenuItemClickListener, LoaderManager.LoaderCallbacks<AccountActivity.AccountInfo> {
     public static final String EXTRA_ACCOUNT = "account";
 
@@ -86,6 +88,7 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
     Toolbar tbCardDAV, tbCalDAV;
 
     @Override
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
@@ -113,6 +116,22 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
         getLoaderManager().initLoader(0, getIntent().getExtras(), this);
     }
 
+    @Override
+    protected void onPause() {
+        super.onPause();
+        CustomCertManager certManager = ((App)getApplicationContext()).getCertManager();
+        if (certManager != null)
+            certManager.appInForeground = false;
+    }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        CustomCertManager certManager = ((App)getApplicationContext()).getCertManager();
+        if (certManager != null)
+            certManager.appInForeground = true;
+    }
+
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.activity_account, menu);
@@ -152,12 +171,15 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
 
     @Override
     public boolean onMenuItemClick(MenuItem item) {
+        Intent intent;
         switch (item.getItemId()) {
             case R.id.refresh_address_books:
-                Intent intent = new Intent(this, DavService.class);
-                intent.setAction(DavService.ACTION_REFRESH_COLLECTIONS);
-                intent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, accountInfo.carddav.id);
-                startService(intent);
+                if (accountInfo.carddav != null) {
+                    intent = new Intent(this, DavService.class);
+                    intent.setAction(DavService.ACTION_REFRESH_COLLECTIONS);
+                    intent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, accountInfo.carddav.id);
+                    startService(intent);
+                }
                 break;
             case R.id.create_address_book:
                 intent = new Intent(this, CreateAddressBookActivity.class);
@@ -165,10 +187,12 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
                 startActivity(intent);
                 break;
             case R.id.refresh_calendars:
-                intent = new Intent(this, DavService.class);
-                intent.setAction(DavService.ACTION_REFRESH_COLLECTIONS);
-                intent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, accountInfo.caldav.id);
-                startService(intent);
+                if (accountInfo.caldav != null) {
+                    intent = new Intent(this, DavService.class);
+                    intent.setAction(DavService.ACTION_REFRESH_COLLECTIONS);
+                    intent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, accountInfo.caldav.id);
+                    startService(intent);
+                }
                 break;
             case R.id.create_calendar:
                 intent = new Intent(this, CreateCalendarActivity.class);
@@ -197,7 +221,7 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
             OpenHelper dbHelper = new OpenHelper(AccountActivity.this);
             try {
                 SQLiteDatabase db = dbHelper.getWritableDatabase();
-                db.beginTransaction();
+                db.beginTransactionNonExclusive();
 
                 if (list.getChoiceMode() == AbsListView.CHOICE_MODE_SINGLE) {
                     // disable all other collections
@@ -265,7 +289,7 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
 
     @Override
     public Loader<AccountInfo> onCreateLoader(int id, Bundle args) {
-        return new AccountLoader(this, account.name);
+        return new AccountLoader(this, account);
     }
 
     public void reload() {
@@ -331,19 +355,20 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
     }
 
 
-    private static class AccountLoader extends AsyncTaskLoader<AccountInfo> implements DavService.RefreshingStatusListener, ServiceConnection {
-        private final String accountName;
-        private final OpenHelper dbHelper;
+    private static class AccountLoader extends AsyncTaskLoader<AccountInfo> implements DavService.RefreshingStatusListener, ServiceConnection, SyncStatusObserver {
+        private final Account account;
         private DavService.InfoBinder davService;
+        private Object syncStatusListener;
 
-        public AccountLoader(Context context, String accountName) {
+        public AccountLoader(Context context, Account account) {
             super(context);
-            this.accountName = accountName;
-            dbHelper = new OpenHelper(context);
+            this.account = account;
         }
 
         @Override
         protected void onStartLoading() {
+            syncStatusListener = ContentResolver.addStatusChangeListener(SYNC_OBSERVER_TYPE_ACTIVE, this);
+
             getContext().bindService(new Intent(getContext(), DavService.class), this, Context.BIND_AUTO_CREATE);
         }
 
@@ -351,6 +376,9 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
         protected void onStopLoading() {
             davService.removeRefreshingStatusListener(this);
             getContext().unbindService(this);
+
+            if (syncStatusListener != null)
+                ContentResolver.removeStatusChangeListener(syncStatusListener);
         }
 
         @Override
@@ -371,46 +399,47 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
             forceLoad();
         }
 
+        @Override
+        public void onStatusChanged(int which) {
+            forceLoad();
+        }
+
         @Override
         public AccountInfo loadInBackground() {
-            // peek into AccountSettings to call possible 0.9 -> 1.0 migration
-            // The next line can be removed as soon as migration from 0.9 is not required anymore!
-            try {
-                new AccountSettings(getContext(), new Account(accountName, Constants.ACCOUNT_TYPE));
-            } catch (InvalidAccountException e) {
-                App.log.log(Level.INFO, "Account doesn't exist (anymore)", e);
-                return null;
-            }
-
             AccountInfo info = new AccountInfo();
-            try {
-                SQLiteDatabase db = dbHelper.getReadableDatabase();
 
-                @Cleanup Cursor cursor = db.query(
-                        Services._TABLE,
-                        new String[] { Services.ID, Services.SERVICE },
-                        Services.ACCOUNT_NAME + "=?", new String[] { accountName },
-                        null, null, null);
-                while (cursor.moveToNext()) {
-                    long id = cursor.getLong(0);
-                    String service = cursor.getString(1);
-                    if (Services.SERVICE_CARDDAV.equals(service)) {
-                        info.carddav = new AccountInfo.ServiceInfo();
-                        info.carddav.id = id;
-                        info.carddav.refreshing = davService.isRefreshing(id);
-                        info.carddav.hasHomeSets = hasHomeSets(db, id);
-                        info.carddav.collections = readCollections(db, id);
+            @Cleanup OpenHelper dbHelper = new OpenHelper(getContext());
+            SQLiteDatabase db = dbHelper.getReadableDatabase();
 
-                    } else if (Services.SERVICE_CALDAV.equals(service)) {
-                        info.caldav = new AccountInfo.ServiceInfo();
-                        info.caldav.id = id;
-                        info.caldav.refreshing = davService.isRefreshing(id);
-                        info.caldav.hasHomeSets = hasHomeSets(db, id);
-                        info.caldav.collections = readCollections(db, id);
-                    }
+            @Cleanup Cursor cursor = db.query(
+                    Services._TABLE,
+                    new String[] { Services.ID, Services.SERVICE },
+                    Services.ACCOUNT_NAME + "=?", new String[] { account.name },
+                    null, null, null);
+
+            if (cursor.getCount() == 0)
+                // no services, account not useable
+                return null;
+
+            while (cursor.moveToNext()) {
+                long id = cursor.getLong(0);
+                String service = cursor.getString(1);
+                if (Services.SERVICE_CARDDAV.equals(service)) {
+                    info.carddav = new AccountInfo.ServiceInfo();
+                    info.carddav.id = id;
+                    info.carddav.refreshing = (davService != null && davService.isRefreshing(id)) || ContentResolver.isSyncActive(account, ContactsContract.AUTHORITY);
+                    info.carddav.hasHomeSets = hasHomeSets(db, id);
+                    info.carddav.collections = readCollections(db, id);
+
+                } else if (Services.SERVICE_CALDAV.equals(service)) {
+                    info.caldav = new AccountInfo.ServiceInfo();
+                    info.caldav.id = id;
+                    info.caldav.refreshing = (davService != null && davService.isRefreshing(id)) ||
+                            ContentResolver.isSyncActive(account, CalendarContract.AUTHORITY) ||
+                            ContentResolver.isSyncActive(account, TaskProvider.ProviderName.OpenTasks.authority);
+                    info.caldav.hasHomeSets = hasHomeSets(db, id);
+                    info.caldav.collections = readCollections(db, id);
                 }
-            } finally {
-                dbHelper.close();
             }
             return info;
         }
@@ -432,6 +461,7 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
             }
             return collections;
         }
+
     }
 
 
@@ -557,7 +587,8 @@ public class AccountActivity extends AppCompatActivity implements Toolbar.OnMenu
 
         for (String authority : authorities) {
             Bundle extras = new Bundle();
-            extras.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);
+            extras.putBoolean(ContentResolver.SYNC_EXTRAS_MANUAL, true);        // manual sync
+            extras.putBoolean(ContentResolver.SYNC_EXTRAS_EXPEDITED, true);     // run immediately (don't queue)
             ContentResolver.requestSync(account, authority, extras);
         }
 

app/src/main/java/at/bitfire/davdroid/ui/AccountListFragment.java

@@ -11,6 +11,7 @@ package at.bitfire.davdroid.ui;
 import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.accounts.OnAccountsUpdateListener;
+import android.annotation.SuppressLint;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
@@ -28,7 +29,6 @@ import android.widget.ListView;
 import android.widget.TextView;
 
 import at.bitfire.davdroid.AccountsChangedReceiver;
-import at.bitfire.davdroid.Constants;
 import at.bitfire.davdroid.R;
 
 public class AccountListFragment extends ListFragment implements LoaderManager.LoaderCallbacks<Account[]>, AdapterView.OnItemClickListener {
@@ -103,8 +103,9 @@ public class AccountListFragment extends ListFragment implements LoaderManager.L
         }
 
         @Override
+        @SuppressLint("MissingPermission")
         public Account[] loadInBackground() {
-            return accountManager.getAccountsByType(Constants.ACCOUNT_TYPE);
+            return accountManager.getAccountsByType(getContext().getString(R.string.account_type));
         }
     }
 

app/src/main/java/at/bitfire/davdroid/ui/AccountSettingsActivity.java

@@ -9,28 +9,29 @@
 package at.bitfire.davdroid.ui;
 
 import android.accounts.Account;
-import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
 import android.provider.CalendarContract;
 import android.provider.ContactsContract;
 import android.support.v4.app.NavUtils;
-import android.support.v7.app.AlertDialog;
 import android.support.v7.app.AppCompatActivity;
 import android.support.v7.preference.EditTextPreference;
 import android.support.v7.preference.ListPreference;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceFragmentCompat;
 import android.support.v7.preference.SwitchPreferenceCompat;
+import android.text.TextUtils;
 import android.view.MenuItem;
 
 import java.util.logging.Level;
 
 import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
+import at.bitfire.davdroid.BuildConfig;
 import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.R;
 import at.bitfire.ical4android.TaskProvider;
+import at.bitfire.vcard4android.GroupMethod;
 
 public class AccountSettingsActivity extends AppCompatActivity {
     public final static String EXTRA_ACCOUNT = "account";
@@ -85,7 +86,7 @@ public class AccountSettingsActivity extends AppCompatActivity {
 
             try {
                 settings = new AccountSettings(getActivity(), account);
-            }  catch(InvalidAccountException e) {
+            } catch(InvalidAccountException e) {
                 App.log.log(Level.INFO, "Account is invalid or doesn't exist (anymore)", e);
                 getActivity().finish();
                 return;
@@ -98,8 +99,9 @@ public class AccountSettingsActivity extends AppCompatActivity {
             prefUserName.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                 @Override
                 public boolean onPreferenceChange(Preference preference, Object newValue) {
-                    settings.username((String) newValue);
-                    refresh(); return false;
+                    settings.username((String)newValue);
+                    refresh();
+                    return false;
                 }
             });
 
@@ -107,18 +109,9 @@ public class AccountSettingsActivity extends AppCompatActivity {
             prefPassword.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                 @Override
                 public boolean onPreferenceChange(Preference preference, Object newValue) {
-                    settings.password((String) newValue);
-                    refresh(); return false;
-                }
-            });
-
-            final SwitchPreferenceCompat prefPreemptive = (SwitchPreferenceCompat)findPreference("preemptive");
-            prefPreemptive.setChecked(settings.preemptiveAuth());
-            prefPreemptive.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
-                @Override
-                public boolean onPreferenceChange(Preference preference, Object newValue) {
-                    settings.preemptiveAuth((Boolean) newValue);
-                    refresh(); return false;
+                    settings.password((String)newValue);
+                    refresh();
+                    return false;
                 }
             });
 
@@ -134,8 +127,9 @@ public class AccountSettingsActivity extends AppCompatActivity {
                 prefSyncContacts.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                     @Override
                     public boolean onPreferenceChange(Preference preference, Object newValue) {
-                        settings.setSyncInterval(ContactsContract.AUTHORITY, Long.parseLong((String) newValue));
-                        refresh(); return false;
+                        settings.setSyncInterval(ContactsContract.AUTHORITY, Long.parseLong((String)newValue));
+                        refresh();
+                        return false;
                     }
                 });
             } else {
@@ -154,8 +148,9 @@ public class AccountSettingsActivity extends AppCompatActivity {
                 prefSyncCalendars.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                     @Override
                     public boolean onPreferenceChange(Preference preference, Object newValue) {
-                        settings.setSyncInterval(CalendarContract.AUTHORITY, Long.parseLong((String) newValue));
-                        refresh(); return false;
+                        settings.setSyncInterval(CalendarContract.AUTHORITY, Long.parseLong((String)newValue));
+                        refresh();
+                        return false;
                     }
                 });
             } else {
@@ -174,8 +169,9 @@ public class AccountSettingsActivity extends AppCompatActivity {
                 prefSyncTasks.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                     @Override
                     public boolean onPreferenceChange(Preference preference, Object newValue) {
-                        settings.setSyncInterval(TaskProvider.ProviderName.OpenTasks.authority, Long.parseLong((String) newValue));
-                        refresh(); return false;
+                        settings.setSyncInterval(TaskProvider.ProviderName.OpenTasks.authority, Long.parseLong((String)newValue));
+                        refresh();
+                        return false;
                     }
                 });
             } else {
@@ -183,30 +179,97 @@ public class AccountSettingsActivity extends AppCompatActivity {
                 prefSyncTasks.setSummary(R.string.settings_sync_summary_not_available);
             }
 
-            final EditTextPreference prefTimeRangePastDays = (EditTextPreference)findPreference("caldav_time_range_past_days");
-            Integer pastDays =  settings.getTimeRangePastDays();
-            if (pastDays != null) {
-                prefTimeRangePastDays.setText(pastDays.toString());
-                prefTimeRangePastDays.setSummary(getResources().getQuantityString(R.plurals.settings_sync_time_range_past_days, pastDays, pastDays));
-            } else {
-                prefTimeRangePastDays.setText(null);
-                prefTimeRangePastDays.setSummary(R.string.settings_sync_time_range_past_none);
-            }
-            prefTimeRangePastDays.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+            final SwitchPreferenceCompat prefWifiOnly = (SwitchPreferenceCompat)findPreference("sync_wifi_only");
+            prefWifiOnly.setChecked(settings.getSyncWifiOnly());
+            prefWifiOnly.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
                 @Override
-                public boolean onPreferenceChange(Preference preference, Object newValue) {
-                    int days;
-                    try {
-                        days = Integer.parseInt((String)newValue);
-                    } catch(NumberFormatException ignored) {
-                        days = -1;
-                    }
-                    settings.setTimeRangePastDays(days < 0 ? null : days);
-                    refresh(); return false;
+                public boolean onPreferenceChange(Preference preference, Object wifiOnly) {
+                    settings.setSyncWiFiOnly((Boolean)wifiOnly);
+                    refresh();
+                    return false;
                 }
             });
 
-        }
+            final EditTextPreference prefWifiOnlySSID = (EditTextPreference)findPreference("sync_wifi_only_ssid");
+            final String onlySSID = settings.getSyncWifiOnlySSID();
+            prefWifiOnlySSID.setText(onlySSID);
+            if (onlySSID != null)
+                prefWifiOnlySSID.setSummary(getString(R.string.settings_sync_wifi_only_ssid_on, onlySSID));
+            else
+                prefWifiOnlySSID.setSummary(R.string.settings_sync_wifi_only_ssid_off);
+            prefWifiOnlySSID.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                @Override
+                public boolean onPreferenceChange(Preference preference, Object newValue) {
+                    String ssid = (String)newValue;
+                    settings.setSyncWifiOnlySSID(!TextUtils.isEmpty(ssid) ? ssid : null);
+                    refresh();
+                    return false;
+                }
+            });
 
+            // category: CardDAV
+            final ListPreference prefGroupMethod = (ListPreference)findPreference("contact_group_method");
+            if (syncIntervalContacts != null) {
+                prefGroupMethod.setValue(settings.getGroupMethod().name());
+                prefGroupMethod.setSummary(prefGroupMethod.getEntry());
+                if (BuildConfig.settingContactGroupMethod == null)
+                    prefGroupMethod.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                        @Override
+                        public boolean onPreferenceChange(Preference preference, Object o) {
+                            String name = (String)o;
+                            settings.setGroupMethod(GroupMethod.valueOf(name));
+                            refresh();
+                            return false;
+                        }
+                    });
+                else
+                    prefGroupMethod.setEnabled(false);
+            } else
+                prefGroupMethod.setEnabled(false);
+
+            // category: CalDAV
+            final EditTextPreference prefTimeRangePastDays = (EditTextPreference)findPreference("time_range_past_days");
+            if (syncIntervalCalendars != null) {
+                Integer pastDays = settings.getTimeRangePastDays();
+                if (pastDays != null) {
+                    prefTimeRangePastDays.setText(pastDays.toString());
+                    prefTimeRangePastDays.setSummary(getResources().getQuantityString(R.plurals.settings_sync_time_range_past_days, pastDays, pastDays));
+                } else {
+                    prefTimeRangePastDays.setText(null);
+                    prefTimeRangePastDays.setSummary(R.string.settings_sync_time_range_past_none);
+                }
+                prefTimeRangePastDays.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                    @Override
+                    public boolean onPreferenceChange(Preference preference, Object newValue) {
+                        int days;
+                        try {
+                            days = Integer.parseInt((String)newValue);
+                        } catch(NumberFormatException ignored) {
+                            days = -1;
+                        }
+                        settings.setTimeRangePastDays(days < 0 ? null : days);
+                        refresh();
+                        return false;
+                    }
+                });
+            } else
+                prefTimeRangePastDays.setEnabled(false);
+
+            final SwitchPreferenceCompat prefManageColors = (SwitchPreferenceCompat)findPreference("manage_calendar_colors");
+            if (syncIntervalCalendars != null || syncIntervalTasks != null) {
+                prefManageColors.setChecked(settings.getManageCalendarColors());
+                prefManageColors.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                    @Override
+                    public boolean onPreferenceChange(Preference preference, Object newValue) {
+                        settings.setManageCalendarColors((Boolean)newValue);
+                        refresh();
+                        return false;
+                    }
+                });
+            } else
+                prefManageColors.setEnabled(false);
+
+        }
     }
+
 }

app/src/main/java/at/bitfire/davdroid/ui/AccountsActivity.java

@@ -9,7 +9,6 @@
 package at.bitfire.davdroid.ui;
 
 import android.content.Intent;
-import android.net.Uri;
 import android.os.Bundle;
 import android.support.design.widget.FloatingActionButton;
 import android.support.design.widget.NavigationView;
@@ -22,12 +21,16 @@ import android.support.v7.widget.Toolbar;
 import android.view.MenuItem;
 import android.view.View;
 
-import at.bitfire.davdroid.Constants;
+import java.util.ServiceLoader;
+
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.ui.setup.LoginActivity;
 
 public class AccountsActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
 
+    private static final ServiceLoader<IAccountsDrawerHandler> serviceLoader = ServiceLoader.load(IAccountsDrawerHandler.class);
+    private static final IAccountsDrawerHandler accountsDrawerHandler = serviceLoader.iterator().next();
+
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -73,33 +76,12 @@ public class AccountsActivity extends AppCompatActivity implements NavigationVie
 
     @Override
     public boolean onNavigationItemSelected(MenuItem item) {
-        switch (item.getItemId()) {
-            case R.id.nav_about:
-                startActivity(new Intent(this, AboutActivity.class));
-                break;
-            case R.id.nav_app_settings:
-                startActivity(new Intent(this, AppSettingsActivity.class));
-                break;
-            case R.id.nav_twitter:
-                startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("https://twitter.com/davdroidapp")));
-                break;
-            case R.id.nav_website:
-                startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri));
-                break;
-            case R.id.nav_faq:
-                startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("faq/").build()));
-                break;
-            case R.id.nav_forums:
-                startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("forums/").build()));
-                break;
-            case R.id.nav_donate:
-                startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("donate/").build()));
-                break;
-        }
+        boolean processed = accountsDrawerHandler.onNavigationItemSelected(this, item);
 
         DrawerLayout drawer = (DrawerLayout)findViewById(R.id.drawer_layout);
         drawer.closeDrawer(GravityCompat.START);
-        return true;
+
+        return processed;
     }
 
 }

app/src/main/java/at/bitfire/davdroid/ui/AppSettingsActivity.java

@@ -12,20 +12,18 @@ import android.content.Intent;
 import android.os.Bundle;
 import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.preference.EditTextPreference;
 import android.support.v7.preference.Preference;
 import android.support.v7.preference.PreferenceFragmentCompat;
 import android.support.v7.preference.SwitchPreferenceCompat;
 
-import java.security.KeyStoreException;
-import java.util.Enumeration;
-import java.util.logging.Level;
+import java.net.URI;
+import java.net.URISyntaxException;
 
 import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.model.ServiceDB;
 import at.bitfire.davdroid.model.Settings;
-import de.duenndns.ssl.MemorizingTrustManager;
-import lombok.Cleanup;
 
 public class AppSettingsActivity extends AppCompatActivity {
 
@@ -42,19 +40,102 @@ public class AppSettingsActivity extends AppCompatActivity {
 
 
     public static class SettingsFragment extends PreferenceFragmentCompat {
-        Preference prefResetHints,
-                    prefResetCertificates;
-        SwitchPreferenceCompat prefLogToExternalStorage;
+        ServiceDB.OpenHelper dbHelper;
+        Settings settings;
+
+        Preference
+                prefResetHints,
+                prefResetCertificates;
+        SwitchPreferenceCompat
+                prefOverrideProxy,
+                prefDistrustSystemCerts,
+                prefLogToExternalStorage;
+
+        EditTextPreference
+                prefProxyHost,
+                prefProxyPort;
+
+        @Override
+        public void onCreate(Bundle savedInstanceState) {
+            dbHelper = new ServiceDB.OpenHelper(getContext());
+            settings = new Settings(dbHelper.getReadableDatabase());
+
+            super.onCreate(savedInstanceState);
+        }
+
+        @Override
+        public void onDestroy() {
+            super.onDestroy();
+            dbHelper.close();
+        }
 
         @Override
         public void onCreatePreferences(Bundle bundle, String s) {
             addPreferencesFromResource(R.xml.settings_app);
 
             prefResetHints = findPreference("reset_hints");
-            prefResetCertificates = findPreference("reset_certificates");
 
-            @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
-            Settings settings = new Settings(dbHelper.getReadableDatabase());
+            prefOverrideProxy = (SwitchPreferenceCompat)findPreference("override_proxy");
+            prefOverrideProxy.setChecked(settings.getBoolean(App.OVERRIDE_PROXY, false));
+            prefOverrideProxy.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                @Override
+                public boolean onPreferenceChange(Preference preference, Object newValue) {
+                    settings.putBoolean(App.OVERRIDE_PROXY, (boolean)newValue);
+                    return true;
+                }
+            });
+
+            prefProxyHost = (EditTextPreference)findPreference("proxy_host");
+            String proxyHost = settings.getString(App.OVERRIDE_PROXY_HOST, App.OVERRIDE_PROXY_HOST_DEFAULT);
+            prefProxyHost.setText(proxyHost);
+            prefProxyHost.setSummary(proxyHost);
+            prefProxyHost.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                @Override
+                public boolean onPreferenceChange(Preference preference, Object newValue) {
+                    String host = (String)newValue;
+                    try {
+                        URI uri = new URI(null, host, null, null);
+                    } catch(URISyntaxException e) {
+                        Snackbar.make(getView(), e.getLocalizedMessage(), Snackbar.LENGTH_LONG).show();
+                        return false;
+                    }
+                    settings.putString(App.OVERRIDE_PROXY_HOST, host);
+                    prefProxyHost.setSummary(host);
+                    return true;
+                }
+            });
+
+            prefProxyPort = (EditTextPreference)findPreference("proxy_port");
+            String proxyPort = settings.getString(App.OVERRIDE_PROXY_PORT, String.valueOf(App.OVERRIDE_PROXY_PORT_DEFAULT));
+            prefProxyPort.setText(proxyPort);
+            prefProxyPort.setSummary(proxyPort);
+            prefProxyPort.setOnPreferenceChangeListener(new Preference.OnPreferenceChangeListener() {
+                @Override
+                public boolean onPreferenceChange(Preference preference, Object newValue) {
+                    int port;
+                    try {
+                        port = Integer.parseInt((String)newValue);
+                    } catch(NumberFormatException e) {
+                        port = App.OVERRIDE_PROXY_PORT_DEFAULT;
+                    }
+                    settings.putInt(App.OVERRIDE_PROXY_PORT, port);
+                    prefProxyPort.setText(String.valueOf(port));
+                    prefProxyPort.setSummary(String.valueOf(port));
+                    return true;
+                }
+            });
+
+            prefDistrustSystemCerts = (SwitchPreferenceCompat)findPreference("distrust_system_certs");
+            App app = (App)getContext().getApplicationContext();
+            if (app.getCertManager() == null)
+                prefDistrustSystemCerts.setVisible(false);
+            else
+                prefDistrustSystemCerts.setChecked(settings.getBoolean(App.DISTRUST_SYSTEM_CERTIFICATES, false));
+
+            prefResetCertificates = findPreference("reset_certificates");
+            if (app.getCertManager() == null)
+                prefResetCertificates.setVisible(false);
+
             prefLogToExternalStorage = (SwitchPreferenceCompat)findPreference("log_to_external_storage");
             prefLogToExternalStorage.setChecked(settings.getBoolean(App.LOG_TO_EXTERNAL_STORAGE, false));
         }
@@ -63,6 +144,8 @@ public class AppSettingsActivity extends AppCompatActivity {
         public boolean onPreferenceTreeClick(Preference preference) {
             if (preference == prefResetHints)
                 resetHints();
+            else if (preference == prefDistrustSystemCerts)
+                setDistrustSystemCerts(((SwitchPreferenceCompat)preference).isChecked());
             else if (preference == prefResetCertificates)
                 resetCertificates();
             else if (preference == prefLogToExternalStorage)
@@ -73,31 +156,29 @@ public class AppSettingsActivity extends AppCompatActivity {
         }
 
         private void resetHints() {
-            @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
-            Settings settings = new Settings(dbHelper.getWritableDatabase());
+            settings.remove(StartupDialogFragment.HINT_BATTERY_OPTIMIZATIONS);
             settings.remove(StartupDialogFragment.HINT_GOOGLE_PLAY_ACCOUNTS_REMOVED);
             settings.remove(StartupDialogFragment.HINT_OPENTASKS_NOT_INSTALLED);
             Snackbar.make(getView(), R.string.app_settings_reset_hints_success, Snackbar.LENGTH_LONG).show();
         }
 
-        private void resetCertificates() {
-            MemorizingTrustManager mtm = App.getMemorizingTrustManager();
+        private void setDistrustSystemCerts(boolean distrust) {
+            settings.putBoolean(App.DISTRUST_SYSTEM_CERTIFICATES, distrust);
 
-            int deleted = 0;
-            Enumeration<String> iterator = mtm.getCertificates();
-            while (iterator.hasMoreElements())
-                try {
-                    mtm.deleteCertificate(iterator.nextElement());
-                    deleted++;
-                } catch (KeyStoreException e) {
-                    App.log.log(Level.SEVERE, "Couldn't distrust certificate", e);
-                }
-            Snackbar.make(getView(), getResources().getQuantityString(R.plurals.app_settings_reset_trusted_certificates_success, deleted, deleted), Snackbar.LENGTH_LONG).show();
+            // re-initialize certificate manager
+            App app = (App)getContext().getApplicationContext();
+            app.reinitCertManager();
+
+            // reinitialize certificate manager of :sync process
+            getContext().sendBroadcast(new Intent(App.ReinitSettingsReceiver.ACTION_REINIT_SETTINGS));
+        }
+
+        private void resetCertificates() {
+            ((App)getContext().getApplicationContext()).getCertManager().resetCertificates();
+            Snackbar.make(getView(), getString(R.string.app_settings_reset_certificates_success), Snackbar.LENGTH_LONG).show();
         }
 
         private void setExternalLogging(boolean externalLogging) {
-            @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
-            Settings settings = new Settings(dbHelper.getWritableDatabase());
             settings.putBoolean(App.LOG_TO_EXTERNAL_STORAGE, externalLogging);
 
             // reinitialize logger of default process
@@ -105,7 +186,7 @@ public class AppSettingsActivity extends AppCompatActivity {
             app.reinitLogger();
 
             // reinitialize logger of :sync process
-            getContext().sendBroadcast(new Intent("at.bitfire.davdroid.REINIT_LOGGER"));
+            getContext().sendBroadcast(new Intent(App.ReinitSettingsReceiver.ACTION_REINIT_SETTINGS));
         }
     }
 

app/src/main/java/at/bitfire/davdroid/ui/DebugInfoActivity.java

@@ -10,6 +10,7 @@ package at.bitfire.davdroid.ui;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
+import android.annotation.SuppressLint;
 import android.app.LoaderManager;
 import android.content.AsyncTaskLoader;
 import android.content.ContentResolver;
@@ -17,19 +18,13 @@ import android.content.Context;
 import android.content.Intent;
 import android.content.Loader;
 import android.content.pm.PackageManager;
-import android.database.Cursor;
-import android.database.DatabaseUtils;
-import android.database.sqlite.SQLiteDatabase;
-import android.database.sqlite.SQLiteException;
-import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
 import android.provider.CalendarContract;
 import android.provider.ContactsContract;
-import android.support.v4.database.DatabaseUtilsCompat;
+import android.support.v4.content.FileProvider;
 import android.support.v7.app.AppCompatActivity;
 import android.text.TextUtils;
-import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.widget.TextView;
@@ -47,7 +42,6 @@ import at.bitfire.dav4android.exception.HttpException;
 import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.BuildConfig;
-import at.bitfire.davdroid.Constants;
 import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.model.ServiceDB;
@@ -55,14 +49,12 @@ import lombok.Cleanup;
 
 public class DebugInfoActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<String> {
     public static final String
-            KEY_EXCEPTION = "exception",
+            KEY_THROWABLE = "throwable",
             KEY_LOGS = "logs",
             KEY_ACCOUNT = "account",
             KEY_AUTHORITY = "authority",
             KEY_PHASE = "phase";
 
-    private static final int MAX_INLINE_REPORT_LENGTH = 8000;
-
     TextView tvReport;
     String report;
 
@@ -90,31 +82,41 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
             Intent sendIntent = new Intent();
             sendIntent.setAction(Intent.ACTION_SEND);
             sendIntent.setType("text/plain");
-            sendIntent.putExtra(Intent.EXTRA_SUBJECT, "DAVdroid debug info");
+            sendIntent.putExtra(Intent.EXTRA_SUBJECT, getString(R.string.app_name) + " " + BuildConfig.VERSION_NAME + " debug info");
 
-            boolean inline = false;
+            // since Android 4.1, FileProvider permissions are handled in a useful way (using ClipData)
+            boolean asAttachment = Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
 
-            if (report.length() > MAX_INLINE_REPORT_LENGTH)
-                // report is too long for inline text, send it as an attachment
+            if (asAttachment)
                 try {
-                    reportFile = File.createTempFile("davdroid-debug", ".txt", getExternalCacheDir());
+                    File debugInfoDir = new File(getCacheDir(), "debug-info");
+                    debugInfoDir.mkdir();
+
+                    reportFile = new File(debugInfoDir, "debug.txt");
                     App.log.fine("Writing debug info to " + reportFile.getAbsolutePath());
                     FileWriter writer = new FileWriter(reportFile);
                     writer.write(report);
                     writer.close();
 
-                    sendIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(reportFile));
-                } catch (IOException e) {
-                    // let's hope the report is < 1 MB (Android IPC limit)
-                    inline = true;
-                }
-            else
-                inline = true;
+                    sendIntent.putExtra(Intent.EXTRA_STREAM, FileProvider.getUriForFile(this, getString(R.string.authority_log_provider), reportFile));
+                    sendIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
 
-            if (inline)
+                } catch(IOException e) {
+                    // creating an attachment failed, so send it inline
+                    asAttachment = false;
+
+                    StringBuilder builder = new StringBuilder();
+                    builder .append("Couldn't write debug info file:\n")
+                            .append(ExceptionUtils.getStackTrace(e))
+                            .append("\n\n")
+                            .append(report);
+                    report = builder.toString();
+                }
+
+            if (!asAttachment)
                 sendIntent.putExtra(Intent.EXTRA_TEXT, report);
 
-            startActivity(sendIntent);
+            startActivity(Intent.createChooser(sendIntent, null));
         }
     }
 
@@ -150,15 +152,16 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
         }
 
         @Override
+        @SuppressLint("MissingPermission")
         public String loadInBackground() {
-            Exception exception = null;
+            Throwable throwable = null;
             String  logs = null,
                     authority = null;
             Account account = null;
             int phase = -1;
 
             if (extras != null) {
-                exception = (Exception)extras.getSerializable(KEY_EXCEPTION);
+                throwable = (Throwable)extras.getSerializable(KEY_THROWABLE);
                 logs = extras.getString(KEY_LOGS);
                 account = extras.getParcelable(KEY_ACCOUNT);
                 authority = extras.getString(KEY_AUTHORITY);
@@ -176,17 +179,17 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
             if (authority != null)
                 report.append("Authority: ").append(authority).append("\n");
 
-            if (exception instanceof HttpException) {
-                HttpException http = (HttpException)exception;
+            if (throwable instanceof HttpException) {
+                HttpException http = (HttpException)throwable;
                 if (http.request != null)
                     report.append("\nHTTP REQUEST:\n").append(http.request).append("\n\n");
                 if (http.response != null)
                     report.append("HTTP RESPONSE:\n").append(http.response).append("\n");
             }
 
-            if (exception != null)
+            if (throwable != null)
                 report  .append("\nEXCEPTION:\n")
-                        .append(ExceptionUtils.getStackTrace(exception));
+                        .append(ExceptionUtils.getStackTrace(throwable));
 
             if (logs != null)
                 report.append("\nLOGS:\n").append(logs).append("\n");
@@ -201,9 +204,10 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
                     workaroundInstalled = pm.getPackageInfo("at.bitfire.davdroid.jbworkaround", 0) != null;
                 } catch(PackageManager.NameNotFoundException ignored) {}
                 report.append("\nSOFTWARE INFORMATION\n" +
-                                "DAVdroid version: ").append(BuildConfig.VERSION_NAME).append(" (").append(BuildConfig.VERSION_CODE).append(") ").append(new Date(BuildConfig.buildTime)).append("\n")
-                                .append("Installed from: ").append(installedFrom).append("\n")
-                                .append("JB Workaround installed: ").append(workaroundInstalled ? "yes" : "no").append("\n\n");
+                              "Package: ").append(BuildConfig.APPLICATION_ID).append("\n" +
+                              "Version: ").append(BuildConfig.VERSION_NAME).append(" (").append(BuildConfig.VERSION_CODE).append(") ").append(new Date(BuildConfig.buildTime)).append("\n")
+                      .append("Installed from: ").append(installedFrom).append("\n")
+                      .append("JB Workaround installed: ").append(workaroundInstalled ? "yes" : "no").append("\n\n");
             } catch(Exception ex) {
                 App.log.log(Level.SEVERE, "Couldn't get software information", ex);
             }
@@ -212,14 +216,20 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
                     "CONFIGURATION\n" +
                     "System-wide synchronization: ").append(ContentResolver.getMasterSyncAutomatically() ? "automatically" : "manually").append("\n");
             AccountManager accountManager = AccountManager.get(getContext());
-            for (Account acct : accountManager.getAccountsByType(Constants.ACCOUNT_TYPE))
+            for (Account acct : accountManager.getAccountsByType(getContext().getString(R.string.account_type)))
                 try {
                     AccountSettings settings = new AccountSettings(getContext(), acct);
-                    report.append(
-                            "Account: ").append(acct.name).append("\n" +
-                                    "  Address book sync. interval: ").append(syncStatus(settings, ContactsContract.AUTHORITY)).append("\n" +
-                                    "  Calendar     sync. interval: ").append(syncStatus(settings, CalendarContract.AUTHORITY)).append("\n" +
-                                    "  OpenTasks    sync. interval: ").append(syncStatus(settings, "org.dmfs.tasks")).append("\n");
+                    report.append("Account: ").append(acct.name).append("\n" +
+                                  "  Address book sync. interval: ").append(syncStatus(settings, ContactsContract.AUTHORITY)).append("\n" +
+                                  "  Calendar     sync. interval: ").append(syncStatus(settings, CalendarContract.AUTHORITY)).append("\n" +
+                                  "  OpenTasks    sync. interval: ").append(syncStatus(settings, "org.dmfs.tasks")).append("\n" +
+                                  "  WiFi only: ").append(settings.getSyncWifiOnly());
+                    if (settings.getSyncWifiOnlySSID() != null)
+                        report.append(", SSID: ").append(settings.getSyncWifiOnlySSID());
+                    report.append("\n  [CardDAV] Contact group method: ").append(settings.getGroupMethod())
+                          .append("\n  [CalDAV] Time range (past days): ").append(settings.getTimeRangePastDays())
+                          .append("\n           Manage calendar colors: ").append(settings.getManageCalendarColors())
+                          .append("\n");
                 } catch(InvalidAccountException e) {
                     report.append(acct).append(" is invalid (unsupported settings version) or does not exist\n");
                 }
@@ -236,7 +246,7 @@ public class DebugInfoActivity extends AppCompatActivity implements LoaderManage
                                 "Android version: ").append(Build.VERSION.RELEASE).append(" (").append(Build.DISPLAY).append(")\n" +
                                 "Device: ").append(WordUtils.capitalize(Build.MANUFACTURER)).append(" ").append(Build.MODEL).append(" (").append(Build.DEVICE).append(")\n\n"
                 );
-            } catch (Exception ex) {
+            } catch(Exception ex) {
                 App.log.log(Level.SEVERE, "Couldn't get system details", ex);
             }
 

app/src/main/java/at/bitfire/davdroid/ui/ExceptionInfoFragment.java

@@ -57,7 +57,7 @@ public class ExceptionInfoFragment extends DialogFragment {
                     @Override
                     public void onClick(DialogInterface dialog, int which) {
                         Intent intent = new Intent(getContext(), DebugInfoActivity.class);
-                        intent.putExtra(DebugInfoActivity.KEY_EXCEPTION, exception);
+                        intent.putExtra(DebugInfoActivity.KEY_THROWABLE, exception);
                         if (account != null)
                             intent.putExtra(DebugInfoActivity.KEY_ACCOUNT, account);
                         startActivity(intent);

app/src/main/java/at/bitfire/davdroid/ui/IAccountsDrawerHandler.java

@@ -0,0 +1,11 @@
+package at.bitfire.davdroid.ui;
+
+import android.app.Activity;
+import android.support.annotation.NonNull;
+import android.view.MenuItem;
+
+public interface IAccountsDrawerHandler {
+
+    public boolean onNavigationItemSelected(@NonNull Activity activity, MenuItem item);
+
+}

app/src/main/java/at/bitfire/davdroid/ui/PermissionsActivity.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the GNU Public License v3.0
+ * which accompanies this distribution, and is available at
+ * http://www.gnu.org/licenses/gpl.html
+ */
+
+package at.bitfire.davdroid.ui;
+
+import android.Manifest;
+import android.content.pm.PackageManager;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.app.NotificationManagerCompat;
+import android.support.v7.app.AppCompatActivity;
+import android.view.View;
+
+import at.bitfire.davdroid.Constants;
+import at.bitfire.davdroid.R;
+import at.bitfire.davdroid.resource.LocalTaskList;
+
+public class PermissionsActivity extends AppCompatActivity {
+
+    public static final String
+            PERMISSION_READ_TASKS = "org.dmfs.permission.READ_TASKS",
+            PERMISSION_WRITE_TASKS = "org.dmfs.permission.WRITE_TASKS";
+
+    @Override
+    protected void onCreate(@Nullable Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_permissions);
+}
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        refresh();
+    }
+
+    protected void refresh() {
+        boolean noCalendarPermissions =
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CALENDAR) != PackageManager.PERMISSION_GRANTED ||
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_CALENDAR) != PackageManager.PERMISSION_GRANTED;
+        findViewById(R.id.calendar_permissions).setVisibility(noCalendarPermissions ? View.VISIBLE : View.GONE);
+
+        boolean noContactsPermissions =
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED ||
+                ActivityCompat.checkSelfPermission(this, Manifest.permission.WRITE_CONTACTS) != PackageManager.PERMISSION_GRANTED;
+        findViewById(R.id.contacts_permissions).setVisibility(noContactsPermissions ? View.VISIBLE : View.GONE);
+
+        boolean noTaskPermissions;
+        if (LocalTaskList.tasksProviderAvailable(this)) {
+            noTaskPermissions =
+                    ActivityCompat.checkSelfPermission(this, PERMISSION_READ_TASKS) != PackageManager.PERMISSION_GRANTED ||
+                    ActivityCompat.checkSelfPermission(this, PERMISSION_WRITE_TASKS) != PackageManager.PERMISSION_GRANTED;
+            findViewById(R.id.opentasks_permissions).setVisibility(noTaskPermissions ? View.VISIBLE : View.GONE);
+        } else {
+            findViewById(R.id.opentasks_permissions).setVisibility(View.GONE);
+            noTaskPermissions = false;
+        }
+
+        if (!noCalendarPermissions && !noContactsPermissions && !noTaskPermissions) {
+            NotificationManagerCompat nm = NotificationManagerCompat.from(this);
+            nm.cancel(Constants.NOTIFICATION_PERMISSIONS);
+
+            finish();
+        }
+    }
+
+    public void requestCalendarPermissions(View v) {
+        ActivityCompat.requestPermissions(this, new String[] {
+                Manifest.permission.READ_CALENDAR,
+                Manifest.permission.WRITE_CALENDAR
+        }, 0);
+    }
+
+    public void requestContactsPermissions(View v) {
+        ActivityCompat.requestPermissions(this, new String[] {
+                Manifest.permission.READ_CONTACTS,
+                Manifest.permission.WRITE_CONTACTS
+        }, 0);
+    }
+
+    public void requestOpenTasksPermissions(View v) {
+        ActivityCompat.requestPermissions(this, new String[] {
+                PERMISSION_READ_TASKS,
+                PERMISSION_WRITE_TASKS
+        }, 0);
+    }
+
+    @Override
+    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
+        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
+        refresh();
+    }
+}

app/src/main/java/at/bitfire/davdroid/ui/StartupDialogFragment.java

@@ -8,15 +8,19 @@
 
 package at.bitfire.davdroid.ui;
 
+import android.annotation.SuppressLint;
+import android.annotation.TargetApi;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.content.pm.PackageManager;
+import android.database.sqlite.SQLiteDatabase;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;
 import android.os.Build;
 import android.os.Bundle;
+import android.os.PowerManager;
 import android.support.annotation.NonNull;
 import android.support.v4.app.DialogFragment;
 import android.support.v7.app.AlertDialog;
@@ -37,14 +41,15 @@ import lombok.Cleanup;
 
 public class StartupDialogFragment extends DialogFragment {
     public static final String
+            HINT_BATTERY_OPTIMIZATIONS = "hint_BatteryOptimizations",
             HINT_GOOGLE_PLAY_ACCOUNTS_REMOVED = "hint_GooglePlayAccountsRemoved",
             HINT_OPENTASKS_NOT_INSTALLED = "hint_OpenTasksNotInstalled";
 
     private static final String ARGS_MODE = "mode";
 
     enum Mode {
+        BATTERY_OPTIMIZATIONS,
         DEVELOPMENT_VERSION,
-        FDROID_DONATE,
         GOOGLE_PLAY_ACCOUNTS_REMOVED,
         OPENTASKS_NOT_INSTALLED
     }
@@ -59,19 +64,23 @@ public class StartupDialogFragment extends DialogFragment {
             dialogs.add(StartupDialogFragment.instantiate(Mode.DEVELOPMENT_VERSION));
         else {
             // store-specific information
-            final String installedFrom = installedFrom(context);
-            if (installedFrom == null || installedFrom.startsWith("org.fdroid"))
-                dialogs.add(StartupDialogFragment.instantiate(Mode.FDROID_DONATE));
-
-            else if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP &&    // only on Android <5
-                    "com.android.vending".equals(installedFrom) &&              // only when installed from Play Store
+            if (BuildConfig.FLAVOR == App.FLAVOR_GOOGLE_PLAY) {
+                // Play store
+                if (Build.VERSION.SDK_INT < Build.VERSION_CODES.LOLLIPOP &&    // only on Android <5
                     settings.getBoolean(HINT_GOOGLE_PLAY_ACCOUNTS_REMOVED, true))      // and only when "Don't show again" hasn't been clicked yet
-                dialogs.add(StartupDialogFragment.instantiate(Mode.GOOGLE_PLAY_ACCOUNTS_REMOVED));
+                    dialogs.add(StartupDialogFragment.instantiate(Mode.GOOGLE_PLAY_ACCOUNTS_REMOVED));
+            }
+        }
+
+        // battery optimization whitelisting
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && settings.getBoolean(HINT_BATTERY_OPTIMIZATIONS, true)) {
+            PowerManager powerManager = (PowerManager)context.getSystemService(Context.POWER_SERVICE);
+            if (!powerManager.isIgnoringBatteryOptimizations(BuildConfig.APPLICATION_ID))
+                dialogs.add(StartupDialogFragment.instantiate(Mode.BATTERY_OPTIMIZATIONS));
         }
 
         // OpenTasks information
-        if (!LocalTaskList.tasksProviderAvailable(context.getContentResolver()) &&
-                settings.getBoolean(HINT_OPENTASKS_NOT_INSTALLED, true))
+        if (!LocalTaskList.tasksProviderAvailable(context) && settings.getBoolean(HINT_OPENTASKS_NOT_INSTALLED, true))
             dialogs.add(StartupDialogFragment.instantiate(Mode.OPENTASKS_NOT_INSTALLED));
 
         Collections.reverse(dialogs);
@@ -88,16 +97,43 @@ public class StartupDialogFragment extends DialogFragment {
 
     @NonNull
     @Override
+    @TargetApi(Build.VERSION_CODES.M)
+    @SuppressLint("BatteryLife")
     public Dialog onCreateDialog(Bundle savedInstanceState) {
         setCancelable(false);
 
-        final ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
-
         Mode mode = Mode.valueOf(getArguments().getString(ARGS_MODE));
         switch (mode) {
+            case BATTERY_OPTIMIZATIONS:
+                return new AlertDialog.Builder(getActivity())
+                        .setTitle(R.string.startup_battery_optimization)
+                        .setMessage(R.string.startup_battery_optimization_message)
+                        .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                            }
+                        })
+                        .setNeutralButton(R.string.startup_battery_optimization_disable, new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                Intent intent = new Intent(android.provider.Settings.ACTION_REQUEST_IGNORE_BATTERY_OPTIMIZATIONS,
+                                        Uri.parse("package:" + BuildConfig.APPLICATION_ID));
+                                getContext().startActivity(intent);
+                            }
+                        })
+                        .setNegativeButton(R.string.startup_dont_show_again, new DialogInterface.OnClickListener() {
+                            @Override
+                            public void onClick(DialogInterface dialog, int which) {
+                                @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
+                                Settings settings = new Settings(dbHelper.getWritableDatabase());
+                                settings.putBoolean(HINT_BATTERY_OPTIMIZATIONS, false);
+                            }
+                        })
+                        .create();
+
             case DEVELOPMENT_VERSION:
                 return new AlertDialog.Builder(getActivity())
-                        .setIcon(R.drawable.ic_launcher)
+                        .setIcon(R.mipmap.ic_launcher)
                         .setTitle(R.string.startup_development_version)
                         .setMessage(R.string.startup_development_version_message)
                         .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
@@ -108,25 +144,7 @@ public class StartupDialogFragment extends DialogFragment {
                         .setNeutralButton(R.string.startup_development_version_give_feedback, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
-                                startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("forums/beta/").build()));
-                            }
-                        })
-                        .create();
-
-            case FDROID_DONATE:
-                return new AlertDialog.Builder(getActivity())
-                        .setIcon(R.drawable.ic_launcher)
-                        .setTitle(R.string.startup_donate)
-                        .setMessage(R.string.startup_donate_message)
-                        .setPositiveButton(R.string.startup_donate_now, new DialogInterface.OnClickListener() {
-                            @Override
-                            public void onClick(DialogInterface dialog, int which) {
-                                startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("donate/").build()));
-                            }
-                        })
-                        .setNegativeButton(R.string.startup_donate_later, new DialogInterface.OnClickListener() {
-                            @Override
-                            public void onClick(DialogInterface dialog, int which) {
+                                startActivity(new Intent(Intent.ACTION_VIEW, Constants.webUri.buildUpon().appendEncodedPath("forums/").build()));
                             }
                         })
                         .create();
@@ -157,6 +175,7 @@ public class StartupDialogFragment extends DialogFragment {
                         .setNegativeButton(R.string.startup_dont_show_again, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
+                                @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
                                 Settings settings = new Settings(dbHelper.getWritableDatabase());
                                 settings.putBoolean(HINT_GOOGLE_PLAY_ACCOUNTS_REMOVED, false);
                             }
@@ -164,10 +183,13 @@ public class StartupDialogFragment extends DialogFragment {
                         .create();
 
             case OPENTASKS_NOT_INSTALLED:
+                StringBuilder builder = new StringBuilder(getString(R.string.startup_opentasks_not_installed_message));
+                if (Build.VERSION.SDK_INT < 23)
+                    builder.append("\n\n").append(getString(R.string.startup_opentasks_reinstall_davdroid));
                 return new AlertDialog.Builder(getActivity())
                         .setIcon(R.drawable.ic_alarm_on_dark)
                         .setTitle(R.string.startup_opentasks_not_installed)
-                        .setMessage(R.string.startup_opentasks_not_installed_message)
+                        .setMessage(builder.toString())
                         .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
@@ -177,12 +199,16 @@ public class StartupDialogFragment extends DialogFragment {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
                                 Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=org.dmfs.tasks"));
-                                getContext().startActivity(intent);
+                                if (intent.resolveActivity(getContext().getPackageManager()) != null)
+                                    getContext().startActivity(intent);
+                                else
+                                    App.log.warning("No market app available, can't install OpenTasks");
                             }
                         })
                         .setNegativeButton(R.string.startup_dont_show_again, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
+                                @Cleanup ServiceDB.OpenHelper dbHelper = new ServiceDB.OpenHelper(getContext());
                                 Settings settings = new Settings(dbHelper.getWritableDatabase());
                                 settings.putBoolean(HINT_OPENTASKS_NOT_INSTALLED, false);
                             }

app/src/main/java/at/bitfire/davdroid/ui/setup/AccountDetailsFragment.java

@@ -10,10 +10,12 @@ package at.bitfire.davdroid.ui.setup;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
+import android.app.Activity;
 import android.content.ContentResolver;
 import android.content.ContentValues;
 import android.content.Intent;
 import android.database.sqlite.SQLiteDatabase;
+import android.os.Build;
 import android.os.Bundle;
 import android.provider.CalendarContract;
 import android.provider.ContactsContract;
@@ -24,26 +26,34 @@ import android.view.View;
 import android.view.ViewGroup;
 import android.widget.Button;
 import android.widget.EditText;
+import android.widget.Spinner;
 
 import java.net.URI;
 import java.util.logging.Level;
 
 import at.bitfire.davdroid.AccountSettings;
 import at.bitfire.davdroid.App;
-import at.bitfire.davdroid.Constants;
+import at.bitfire.davdroid.BuildConfig;
 import at.bitfire.davdroid.DavService;
+import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.model.CollectionInfo;
 import at.bitfire.davdroid.model.ServiceDB.Collections;
 import at.bitfire.davdroid.model.ServiceDB.HomeSets;
 import at.bitfire.davdroid.model.ServiceDB.OpenHelper;
 import at.bitfire.davdroid.model.ServiceDB.Services;
+import at.bitfire.davdroid.resource.LocalTaskList;
 import at.bitfire.ical4android.TaskProvider;
+import at.bitfire.vcard4android.GroupMethod;
 import lombok.Cleanup;
 
 public class AccountDetailsFragment extends Fragment {
 
     private static final String KEY_CONFIG = "config";
+    private static final int DEFAULT_SYNC_INTERVAL = 4 * 3600;  // 4 hours
+
+    Spinner spnrGroupMethod;
+
 
     public static AccountDetailsFragment newInstance(DavResourceFinder.Configuration config) {
         AccountDetailsFragment frag = new AccountDetailsFragment();
@@ -53,6 +63,7 @@ public class AccountDetailsFragment extends Fragment {
         return frag;
     }
 
+
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         final View v = inflater.inflate(R.layout.login_account_details, container, false);
@@ -68,7 +79,13 @@ public class AccountDetailsFragment extends Fragment {
         DavResourceFinder.Configuration config = (DavResourceFinder.Configuration)getArguments().getSerializable(KEY_CONFIG);
 
         final EditText editName = (EditText)v.findViewById(R.id.account_name);
-        editName.setText(config.userName);
+        editName.setText((config.calDAV != null && config.calDAV.email != null) ? config.calDAV.email : config.userName);
+
+        // CardDAV-specific
+        v.findViewById(R.id.carddav).setVisibility(config.cardDAV != null ? View.VISIBLE : View.GONE);
+        spnrGroupMethod = (Spinner)v.findViewById(R.id.contact_group_method);
+        if (BuildConfig.settingContactGroupMethod != null)
+            spnrGroupMethod.setEnabled(false);
 
         Button btnCreate = (Button)v.findViewById(R.id.create_account);
         btnCreate.setOnClickListener(new View.OnClickListener() {
@@ -78,9 +95,10 @@ public class AccountDetailsFragment extends Fragment {
                 if (name.isEmpty())
                     editName.setError(getString(R.string.login_account_name_required));
                 else {
-                    if (createAccount(name, (DavResourceFinder.Configuration)getArguments().getSerializable(KEY_CONFIG)))
+                    if (createAccount(name, (DavResourceFinder.Configuration)getArguments().getSerializable(KEY_CONFIG))) {
+                        getActivity().setResult(Activity.RESULT_OK);
                         getActivity().finish();
-                    else
+                    } else
                         Snackbar.make(v, R.string.login_account_not_created, Snackbar.LENGTH_LONG).show();
                 }
             }
@@ -90,10 +108,10 @@ public class AccountDetailsFragment extends Fragment {
     }
 
     protected boolean createAccount(String accountName, DavResourceFinder.Configuration config) {
-        Account account = new Account(accountName, Constants.ACCOUNT_TYPE);
+        Account account = new Account(accountName, getString(R.string.account_type));
 
         // create Android account
-        Bundle userData = AccountSettings.initialUserData(config.userName, config.preemptive);
+        Bundle userData = AccountSettings.initialUserData(config.userName);
         App.log.log(Level.INFO, "Creating Android account with initial config", new Object[] { account, userData });
 
         AccountManager accountManager = AccountManager.get(getContext());
@@ -104,40 +122,70 @@ public class AccountDetailsFragment extends Fragment {
         App.log.log(Level.INFO, "Writing account configuration to database", config);
         @Cleanup OpenHelper dbHelper = new OpenHelper(getContext());
         SQLiteDatabase db = dbHelper.getWritableDatabase();
-        db.beginTransactionNonExclusive();
         try {
+            AccountSettings settings = new AccountSettings(getContext(), account);
+
             Intent refreshIntent = new Intent(getActivity(), DavService.class);
             refreshIntent.setAction(DavService.ACTION_REFRESH_COLLECTIONS);
 
             if (config.cardDAV != null) {
+                // insert CardDAV service
                 long id = insertService(db, accountName, Services.SERVICE_CARDDAV, config.cardDAV);
+
+                // start CardDAV service detection (refresh collections)
                 refreshIntent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, id);
                 getActivity().startService(refreshIntent);
 
+                // initial CardDAV account settings
+                int idx = spnrGroupMethod.getSelectedItemPosition();
+                String groupMethodName = getResources().getStringArray(R.array.settings_contact_group_method_values)[idx];
+                settings.setGroupMethod(GroupMethod.valueOf(groupMethodName));
+
+                // enable contact sync
                 ContentResolver.setIsSyncable(account, ContactsContract.AUTHORITY, 1);
-                ContentResolver.setSyncAutomatically(account, ContactsContract.AUTHORITY, true);
+                settings.setSyncInterval(ContactsContract.AUTHORITY, DEFAULT_SYNC_INTERVAL);
             } else
+                // disable contact sync when CardDAV is not available
                 ContentResolver.setIsSyncable(account, ContactsContract.AUTHORITY, 0);
 
             if (config.calDAV != null) {
+                // insert CalDAV service
                 long id = insertService(db, accountName, Services.SERVICE_CALDAV, config.calDAV);
+
+                // start CalDAV service detection (refresh collections)
                 refreshIntent.putExtra(DavService.EXTRA_DAV_SERVICE_ID, id);
                 getActivity().startService(refreshIntent);
 
+                // enable calendar sync
                 ContentResolver.setIsSyncable(account, CalendarContract.AUTHORITY, 1);
-                ContentResolver.setSyncAutomatically(account, CalendarContract.AUTHORITY, true);
+                settings.setSyncInterval(CalendarContract.AUTHORITY, DEFAULT_SYNC_INTERVAL);
 
-                // will only do something if OpenTasks is installed
-                ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 1);
-                ContentResolver.setSyncAutomatically(account, TaskProvider.ProviderName.OpenTasks.authority, true);
+                // enable task sync, if possible
+                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
+                    /* Android >=6, it's possible to gain OpenTasks permissions dynamically, so
+                     * OpenTasks sync will be enabled by default. Setting the sync interval to "manually"
+                     * if OpenTasks is not installed avoids the "sync error" in Android settings / Accounts. */
+                    ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 1);
+                    settings.setSyncInterval(TaskProvider.ProviderName.OpenTasks.authority,
+                            LocalTaskList.tasksProviderAvailable(getContext()) ? DEFAULT_SYNC_INTERVAL : AccountSettings.SYNC_INTERVAL_MANUALLY);
+                } else {
+                    // Android <6: enable task sync according to whether OpenTasks is accessible
+                    if (LocalTaskList.tasksProviderAvailable(getContext())) {
+                        ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 1);
+                        settings.setSyncInterval(TaskProvider.ProviderName.OpenTasks.authority, DEFAULT_SYNC_INTERVAL);
+                    } else
+                        // Android <6 only: disable OpenTasks sync forever when OpenTasks is not installed
+                        // because otherwise, there will be a non-catchable SecurityException as soon as OpenTasks is installed
+                        ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 0);
+                }
             } else {
+                // disable calendar and task sync when CalDAV is not available
                 ContentResolver.setIsSyncable(account, CalendarContract.AUTHORITY, 0);
                 ContentResolver.setIsSyncable(account, TaskProvider.ProviderName.OpenTasks.authority, 0);
             }
 
-            db.setTransactionSuccessful();
-        } finally {
-            db.endTransaction();
+        } catch(InvalidAccountException e) {
+            App.log.log(Level.SEVERE, "Couldn't access account settings", e);
         }
 
         return true;
@@ -151,21 +199,21 @@ public class AccountDetailsFragment extends Fragment {
         values.put(Services.SERVICE, service);
         if (info.principal != null)
             values.put(Services.PRINCIPAL, info.principal.toString());
-        long serviceID = db.insertOrThrow(Services._TABLE, null, values);
+        long serviceID = db.insertWithOnConflict(Services._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
 
         // insert home sets
         for (URI homeSet : info.homeSets) {
             values.clear();
             values.put(HomeSets.SERVICE_ID, serviceID);
             values.put(HomeSets.URL, homeSet.toString());
-            db.insertOrThrow(HomeSets._TABLE, null, values);
+            db.insertWithOnConflict(HomeSets._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
         }
 
         // insert collections
         for (CollectionInfo collection : info.collections.values()) {
             values = collection.toDB();
             values.put(Collections.SERVICE_ID, serviceID);
-            db.insertOrThrow(Collections._TABLE, null, values);
+            db.insertWithOnConflict(Collections._TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
         }
 
         return serviceID;

app/src/main/java/at/bitfire/davdroid/ui/setup/DavResourceFinder.java

@@ -19,6 +19,7 @@ import org.xbill.DNS.Type;
 import java.io.IOException;
 import java.io.Serializable;
 import java.net.URI;
+import java.net.URISyntaxException;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedList;
@@ -28,6 +29,7 @@ import java.util.Set;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
+import at.bitfire.dav4android.Constants;
 import at.bitfire.dav4android.DavResource;
 import at.bitfire.dav4android.UrlUtils;
 import at.bitfire.dav4android.exception.DavException;
@@ -39,13 +41,13 @@ import at.bitfire.dav4android.property.CalendarColor;
 import at.bitfire.dav4android.property.CalendarDescription;
 import at.bitfire.dav4android.property.CalendarHomeSet;
 import at.bitfire.dav4android.property.CalendarTimezone;
+import at.bitfire.dav4android.property.CalendarUserAddressSet;
 import at.bitfire.dav4android.property.CurrentUserPrincipal;
 import at.bitfire.dav4android.property.CurrentUserPrivilegeSet;
 import at.bitfire.dav4android.property.DisplayName;
 import at.bitfire.dav4android.property.ResourceType;
 import at.bitfire.dav4android.property.SupportedCalendarComponentSet;
 import at.bitfire.davdroid.HttpClient;
-import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.log.StringHandler;
 import at.bitfire.davdroid.model.CollectionInfo;
 import lombok.RequiredArgsConstructor;
@@ -78,8 +80,8 @@ public class DavResourceFinder {
         log.setLevel(Level.FINEST);
         log.addHandler(logBuffer);
 
-        httpClient = HttpClient.create(log);
-        httpClient = HttpClient.addAuthentication(httpClient, credentials.userName, credentials.password, credentials.authPreemptive);
+        httpClient = HttpClient.create(context, log);
+        httpClient = HttpClient.addAuthentication(httpClient, credentials.userName, credentials.password);
 	}
 
 
@@ -89,7 +91,7 @@ public class DavResourceFinder {
                 calDavConfig = findInitialConfiguration(Service.CALDAV);
 
         return new Configuration(
-                credentials.userName, credentials.password, credentials.authPreemptive,
+                credentials.userName, credentials.password,
                 cardDavConfig, calDavConfig,
                 logBuffer.toString()
         );
@@ -141,6 +143,26 @@ public class DavResourceFinder {
             }
         }
 
+        if (config.principal != null && service == Service.CALDAV) {
+            // query email address (CalDAV scheduling: calendar-user-address-set)
+            DavResource davPrincipal = new DavResource(httpClient, HttpUrl.get(config.principal), log);
+            try {
+                davPrincipal.propfind(0, CalendarUserAddressSet.NAME);
+                CalendarUserAddressSet addressSet = (CalendarUserAddressSet)davPrincipal.properties.get(CalendarUserAddressSet.NAME);
+                if (addressSet != null)
+                    for (String href : addressSet.hrefs)
+                        try {
+                            URI uri = new URI(href);
+                            if ("mailto".equals(uri.getScheme()))
+                                config.email = uri.getSchemeSpecificPart();
+                        } catch(URISyntaxException e) {
+                            Constants.log.log(Level.WARNING, "Unparseable user address", e);
+                        }
+            } catch(IOException | HttpException | DavException e) {
+                Constants.log.log(Level.WARNING, "Couldn't query user email address", e);
+            }
+        }
+
         // return config or null if config doesn't contain useful information
         boolean serviceAvailable = config.principal != null || !config.homeSets.isEmpty() || !config.collections.isEmpty();
         return serviceAvailable ? config : null;
@@ -178,7 +200,7 @@ public class DavResourceFinder {
             // check for resource type "principal"
             if (principal == null) {
                 ResourceType resourceType = (ResourceType)davBase.properties.get(ResourceType.NAME);
-                if (resourceType.types.contains(ResourceType.PRINCIPAL))
+                if (resourceType != null && resourceType.types.contains(ResourceType.PRINCIPAL))
                     principal = davBase.location;
             }
 
@@ -191,6 +213,13 @@ public class DavResourceFinder {
         }
     }
 
+    /**
+     * If #dav is an address book or an address book home set, it will added to
+     * config.collections or config.homesets. Only evaluates already known properties,
+     * does not call dav.propfind()! URLs will be stored with trailing "/".
+     * @param dav       resource whose properties are evaluated
+     * @param config    structure where the address book (collection) and/or home set is stored into (if found)
+     */
     protected void rememberIfAddressBookOrHomeset(@NonNull DavResource dav, @NonNull Configuration.ServiceInfo config) {
         // Is the collection an address book?
         ResourceType resourceType = (ResourceType)dav.properties.get(ResourceType.NAME);
@@ -203,8 +232,11 @@ public class DavResourceFinder {
         // Does the collection refer to address book homesets?
         AddressbookHomeSet homeSets = (AddressbookHomeSet)dav.properties.get(AddressbookHomeSet.NAME);
         if (homeSets != null)
-            for (String href : homeSets.hrefs)
-                config.homeSets.add(UrlUtils.withTrailingSlash(dav.location.resolve(href)).uri());
+            for (String href : homeSets.hrefs) {
+                HttpUrl location = UrlUtils.withTrailingSlash(dav.location.resolve(href));
+                log.info("Found addressbook home-set at " + location);
+                config.homeSets.add(location.uri());
+            }
     }
 
     protected void rememberIfCalendarOrHomeset(@NonNull DavResource dav, @NonNull Configuration.ServiceInfo config) {
@@ -224,7 +256,7 @@ public class DavResourceFinder {
     }
 
 
-    boolean providesService(HttpUrl url, Service service) throws IOException {
+    protected boolean providesService(HttpUrl url, Service service) throws IOException {
         DavResource davPrincipal = new DavResource(httpClient, url, log);
         try {
             davPrincipal.options();
@@ -303,7 +335,7 @@ public class DavResourceFinder {
 
                 if (principal != null)
                     return principal;
-            } catch(NotFoundException e) {
+            } catch(NotFoundException|IllegalArgumentException e) {
                 log.log(Level.WARNING, "No resource found", e);
             }
         return null;
@@ -319,7 +351,7 @@ public class DavResourceFinder {
         DavResource dav = new DavResource(httpClient, url, log);
         dav.propfind(0, CurrentUserPrincipal.NAME);
 
-        CurrentUserPrincipal currentUserPrincipal = (CurrentUserPrincipal) dav.properties.get(CurrentUserPrincipal.NAME);
+        CurrentUserPrincipal currentUserPrincipal = (CurrentUserPrincipal)dav.properties.get(CurrentUserPrincipal.NAME);
         if (currentUserPrincipal != null && currentUserPrincipal.href != null) {
             HttpUrl principal = dav.location.resolve(currentUserPrincipal.href);
             if (principal != null) {
@@ -359,10 +391,11 @@ public class DavResourceFinder {
             public URI principal;
             public final Set<URI> homeSets = new HashSet<>();
             public final Map<URI, CollectionInfo> collections = new HashMap<>();
+
+            public String email;
         }
 
         public final String userName, password;
-        public final boolean preemptive;
 
         public final ServiceInfo cardDAV;
         public final ServiceInfo calDAV;

app/src/main/java/at/bitfire/davdroid/ui/setup/DetectConfigurationFragment.java

@@ -22,7 +22,6 @@ import android.support.v4.content.Loader;
 import android.support.v7.app.AlertDialog;
 
 import at.bitfire.davdroid.App;
-import at.bitfire.davdroid.InvalidAccountException;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.ui.DebugInfoActivity;
 import at.bitfire.davdroid.ui.setup.DavResourceFinder.Configuration;

app/src/main/java/at/bitfire/davdroid/ui/setup/ILoginCredentialsFragment.java

@@ -0,0 +1,9 @@
+package at.bitfire.davdroid.ui.setup;
+
+import android.support.v4.app.Fragment;
+
+public interface ILoginCredentialsFragment {
+
+    Fragment getFragment();
+
+}

app/src/main/java/at/bitfire/davdroid/ui/setup/LoginActivity.java

@@ -14,23 +14,70 @@ import android.support.v7.app.AppCompatActivity;
 import android.view.Menu;
 import android.view.MenuItem;
 
+import java.util.ServiceLoader;
+
+import at.bitfire.davdroid.App;
 import at.bitfire.davdroid.Constants;
 import at.bitfire.davdroid.R;
 
+/**
+ * Activity to initially connect to a server and create an account.
+ * Fields for server/user data can be pre-filled with extras in the Intent.
+ */
 public class LoginActivity extends AppCompatActivity {
 
+    /**
+     * When set, "login by URL" will be activated by default, and the URL field will be set to this value.
+     * When not set, "login by email" will be activated by default.
+     */
+    public static final String EXTRA_URL = "url";
+
+    /**
+     * When set, and {@link #EXTRA_PASSWORD} is set too, the user name field will be set to this value.
+     * When set, and {@link #EXTRA_URL} is not set, the email address field will be set to this value.
+     */
+    public static final String EXTRA_USERNAME = "username";
+
+    /**
+     * When set, the password field will be set to this value.
+     */
+    public static final String EXTRA_PASSWORD = "password";
+
+
+    private static final ServiceLoader<ILoginCredentialsFragment> loginFragmentLoader = ServiceLoader.load(ILoginCredentialsFragment.class);
+
+
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         if (savedInstanceState == null)
             // first call, add fragment
-            getSupportFragmentManager().beginTransaction()
-                    .replace(android.R.id.content, new LoginCredentialsFragment())
-                    .commit();
+            for (ILoginCredentialsFragment fragment : loginFragmentLoader)
+                getSupportFragmentManager().beginTransaction()
+                        .replace(android.R.id.content, fragment.getFragment())
+                        .commit();
 
     }
 
+    @Override
+    protected void onResume() {
+        super.onResume();
+
+        App app = (App)getApplicationContext();
+        if (app.getCertManager() != null)
+            app.getCertManager().appInForeground = true;
+    }
+
+    @Override
+    protected void onPause() {
+        super.onPause();
+
+        App app = (App)getApplicationContext();
+        if (app.getCertManager() != null)
+            app.getCertManager().appInForeground = false;
+    }
+
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
         getMenuInflater().inflate(R.menu.activity_login, menu);

app/src/main/java/at/bitfire/davdroid/ui/setup/LoginCredentials.java

@@ -19,7 +19,6 @@ import lombok.RequiredArgsConstructor;
 public class LoginCredentials implements Parcelable {
     public final URI uri;
     public final String userName, password;
-    public final boolean authPreemptive;
 
     @Override
     public int describeContents() {
@@ -31,7 +30,6 @@ public class LoginCredentials implements Parcelable {
         dest.writeSerializable(uri);
         dest.writeString(userName);
         dest.writeString(password);
-        dest.writeValue(authPreemptive);
     }
 
     public static final Creator CREATOR = new Creator<LoginCredentials>() {
@@ -39,8 +37,7 @@ public class LoginCredentials implements Parcelable {
         public LoginCredentials createFromParcel(Parcel source) {
             return new LoginCredentials(
                     (URI)source.readSerializable(),
-                    source.readString(), source.readString(),
-                    (boolean)source.readValue(null)
+                    source.readString(), source.readString()
             );
         }
 

app/src/main/res/drawable/chip_bg.xml

@@ -1,25 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
-  ~ All rights reserved. This program and the accompanying materials
-  ~ are made available under the terms of the GNU Public License v3.0
-  ~ which accompanies this distribution, and is available at
-  ~ http://www.gnu.org/licenses/gpl.html
-  -->
-
-<shape xmlns:android="http://schemas.android.com/apk/res/android">
-    <solid android:color="#00ffffff"/>
-
-    <stroke android:width="1dp"
-            android:color="#aa888888"
-        />
-
-    <padding android:left="1dp"
-             android:top="1dp"
-             android:right="1dp"
-             android:bottom="1dp"
-        />
-
-    <corners android:bottomRightRadius="8dp" android:bottomLeftRadius="8dp"
-             android:topLeftRadius="8dp" android:topRightRadius="8dp"/>
-</shape>

app/src/main/res/drawable/ic_new_releases_light.xml

@@ -1,17 +0,0 @@
-<!--
-  ~ Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
-  ~ All rights reserved. This program and the accompanying materials
-  ~ are made available under the terms of the GNU Public License v3.0
-  ~ which accompanies this distribution, and is available at
-  ~ http://www.gnu.org/licenses/gpl.html
-  -->
-
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-        android:width="24dp"
-        android:height="24dp"
-        android:viewportWidth="24.0"
-        android:viewportHeight="24.0">
-    <path
-        android:fillColor="#FFFFFFFF"
-        android:pathData="M23,12l-2.44,-2.78 0.34,-3.68 -3.61,-0.82 -1.89,-3.18L12,3 8.6,1.54 6.71,4.72l-3.61,0.81 0.34,3.68L1,12l2.44,2.78 -0.34,3.69 3.61,0.82 1.89,3.18L12,21l3.4,1.46 1.89,-3.18 3.61,-0.82 -0.34,-3.68L23,12zm-10,5h-2v-2h2v2zm0,-4h-2V7h2v6z"/>
-</vector>

app/src/main/res/drawable/side_nav_bar.xml

@@ -1,16 +0,0 @@
-<!--
-  ~ Copyright © 2013 – 2016 Ricki Hirner (bitfire web engineering).
-  ~ All rights reserved. This program and the accompanying materials
-  ~ are made available under the terms of the GNU Public License v3.0
-  ~ which accompanies this distribution, and is available at
-  ~ http://www.gnu.org/licenses/gpl.html
-  -->
-
-<shape xmlns:android="http://schemas.android.com/apk/res/android"
-       android:shape="rectangle">
-    <gradient
-        android:angle="135"
-        android:endColor="@color/light_green300"
-        android:startColor="@color/green700"
-        android:type="linear"/>
-</shape>