Setup web app, improve styling

app/src/main/AndroidManifest.xml

@@ -1,12 +1,20 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="org.jellyfin.android">
 
+    <uses-permission android:name="android.permission.INTERNET" />
+
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
-        android:theme="@style/AppTheme" />
-
+        android:theme="@style/AppTheme">
+        <activity android:name=".WebappActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
 </manifest>

app/src/main/java/org/jellyfin/android/WebappActivity.kt

@@ -0,0 +1,41 @@
+package org.jellyfin.android
+
+import android.annotation.SuppressLint
+import android.os.Bundle
+import android.webkit.WebChromeClient
+import android.webkit.WebView
+import androidx.appcompat.app.AppCompatActivity
+import org.jellyfin.android.utils.lazyView
+
+class WebappActivity : AppCompatActivity() {
+
+    private val webView: WebView by lazyView<WebView>(R.id.web_view)
+
+    @SuppressLint("SetJavaScriptEnabled")
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_webapp)
+
+        webView.webChromeClient = WebChromeClient()
+        webView.settings.apply {
+            javaScriptEnabled = true
+            domStorageEnabled = true
+            allowUniversalAccessFromFileURLs = true
+        }
+
+        webView.loadUrl("file:///android_asset/www/index.html")
+    }
+
+    override fun onBackPressed() {
+        val history = webView.copyBackForwardList()
+        if (webView.canGoBack() && history.currentIndex > 1) {
+            webView.goBack()
+        } else super.onBackPressed()
+    }
+
+    companion object {
+        init {
+            if (BuildConfig.DEBUG) WebView.setWebContentsDebuggingEnabled(true)
+        }
+    }
+}

app/src/main/java/org/jellyfin/android/utils/ViewUtils.kt

@@ -0,0 +1,10 @@
+@file:Suppress("NOTHING_TO_INLINE")
+
+package org.jellyfin.android.utils
+
+import android.app.Activity
+import android.webkit.WebView
+import androidx.annotation.IdRes
+
+inline fun <T> Activity.lazyView(@IdRes id: Int) =
+    lazy(LazyThreadSafetyMode.NONE) { findViewById<WebView>(id) }

app/src/main/res/layout/activity_webapp.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<WebView xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/web_view"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent" />

app/src/main/res/values/colors.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <color name="colorPrimary">#6200EE</color>
-    <color name="colorPrimaryDark">#3700B3</color>
-    <color name="colorAccent">#03DAC5</color>
+    <color name="colorPrimary">#202020</color>
+    <color name="colorPrimaryDark">#1a1a1a</color>
+    <color name="colorAccent">#00a4dc</color>
 </resources>

app/src/main/res/values/styles.xml

@@ -1,10 +1,8 @@
 <resources>
-    <!-- Base application theme. -->
-    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
-        <!-- Customize your theme here. -->
+    <!-- Application theme -->
+    <style name="AppTheme" parent="Theme.AppCompat.NoActionBar">
         <item name="colorPrimary">@color/colorPrimary</item>
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
     </style>
-
 </resources>