port 1.x swap startup to 2.x

The whole swap setup was designed around having certain tiny background
processes start at app start.  They are designed to be very low impact, run
at lowest priority, and be scheduled via WorkManager.

port was in 0f73f9ca0e

app/src/basic/kotlin/org/fdroid/AppFull.kt

@@ -0,0 +1,10 @@
+package org.fdroid
+
+import android.content.Context;
+
+/** In the basic flavor, this class is just a placeholder. */
+class AppFull {
+    companion object {
+        fun onCreate(context: Context) = println()
+    }
+}

app/src/full/java/org/fdroid/fdroid/nearby/SwapService.java

@@ -363,8 +363,6 @@ public class SwapService extends Service {
     @Nullable
     private Timer timer;
 
-    private final WifiStateChangeReceiver wifiStateChangeReceiver = new WifiStateChangeReceiver();
-
     public class Binder extends android.os.Binder {
         public SwapService getService() {
             return SwapService.this;
@@ -375,8 +373,6 @@ public class SwapService extends Service {
     public void onCreate() {
         super.onCreate();
         startForeground(NOTIFICATION, createNotification());
-        WifiStateChangeService.start(this, null);
-        WifiStateChangeService.registerReceiver(this, wifiStateChangeReceiver);
         localBroadcastManager = LocalBroadcastManager.getInstance(this);
         swapPreferences = getSharedPreferences(SHARED_PREFERENCES, Context.MODE_PRIVATE);
 
@@ -486,7 +482,6 @@ public class SwapService extends Service {
     @Override
     public void onDestroy() {
         Utils.debugLog(TAG, "Destroying service, will disable swapping if required, and unregister listeners.");
-        WifiStateChangeService.unregisterReceiver(this, wifiStateChangeReceiver);
         Preferences.get().unregisterLocalRepoHttpsListeners(httpsEnabledListener);
         localBroadcastManager.unregisterReceiver(onWifiChange);
         localBroadcastManager.unregisterReceiver(bluetoothPeerFound);

app/src/full/java/org/fdroid/fdroid/nearby/WifiStateChangeService.java

@@ -84,18 +84,14 @@ public class WifiStateChangeService extends Worker {
         super(context, workerParams);
     }
 
-    public static void registerReceiver(Context context, WifiStateChangeReceiver wifiStateChangeReceiver) {
+    public static void registerReceiver(Context context) {
         ContextCompat.registerReceiver(
                 context,
-                wifiStateChangeReceiver,
+                new WifiStateChangeReceiver(),
                 new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION),
                 ContextCompat.RECEIVER_NOT_EXPORTED);
     }
 
-    public static void unregisterReceiver(Context context, WifiStateChangeReceiver wifiStateChangeReceiver) {
-        context.unregisterReceiver(wifiStateChangeReceiver);
-    }
-
     public static void start(Context context, @Nullable Intent intent) {
         int networkInfoStateInt = NETWORK_INFO_STATE_NOT_SET;
         if (intent != null) {

app/src/full/kotlin/org/fdroid/AppFull.kt

@@ -0,0 +1,14 @@
+package org.fdroid
+
+import android.content.Context;
+import org.fdroid.fdroid.nearby.WifiStateChangeService
+
+/** Wrapper class to isolate things only needed in the full flavor. */
+class AppFull {
+    companion object {
+        fun onCreate(context: Context) {
+            WifiStateChangeService.registerReceiver(context)
+            WifiStateChangeService.start(context, null)
+        }
+    }
+}

app/src/main/kotlin/org/fdroid/App.kt

@@ -26,6 +26,7 @@ import org.acra.config.dialog
 import org.acra.config.mailSender
 import org.acra.data.StringFormat.JSON
 import org.acra.ktx.initAcra
+import org.fdroid.AppFull
 import org.fdroid.BuildConfig.APPLICATION_ID
 import org.fdroid.BuildConfig.VERSION_NAME
 import org.fdroid.download.DownloadRequest
@@ -106,6 +107,8 @@ class App : Application(), Configuration.Provider, SingletonImageLoader.Factory
 
     RepoUpdateWorker.scheduleOrCancel(applicationContext, settingsManager.repoUpdates)
     AppUpdateWorker.scheduleOrCancel(applicationContext, settingsManager.autoUpdateApps)
+
+    AppFull.onCreate(applicationContext)
   }
 
   private fun isAcraProces(): Boolean {