feat(cast): implement Google Cast support and expanded controller activity

app/src/main/AndroidManifest.xml

@@ -31,11 +31,6 @@
         android:usesCleartextTraffic="true"
         tools:targetApi="33">
 
-        <!-- GOOGLE CAST SUPPORT -->
-        <meta-data
-            android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
-            android:value="com.michatec.radio.CastOptionsProvider" />
-
         <!-- ANDROID AUTO SUPPORT -->
         <meta-data
             android:name="com.google.android.gms.car.application"
@@ -44,6 +39,17 @@
             android:name="com.google.android.gms.car.notification.SmallIcon"
             android:resource="@mipmap/ic_launcher" />
 
+        <!-- GOOGLE CAST SUPPORT -->
+        <receiver android:name="androidx.mediarouter.media.MediaTransferReceiver" />
+        <meta-data
+            android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
+            android:value="com.michatec.radio.CastOptionsProvider" />
+
+        <activity
+            android:name=".ExpandedControllerActivity"
+            android:exported="false"
+            android:launchMode="singleTask" />
+
         <!-- Main activity for radio station playback on phone and TV -->
         <activity
             android:name=".MainActivity"

app/src/main/java/com/michatec/radio/CastOptionsProvider.kt

@@ -16,6 +16,7 @@ class CastOptionsProvider : OptionsProvider {
             .build()
         val mediaOptions = CastMediaOptions.Builder()
             .setNotificationOptions(notificationOptions)
+            .setExpandedControllerActivityClassName(ExpandedControllerActivity::class.java.name)
             .build()
 
         return CastOptions.Builder()

app/src/main/java/com/michatec/radio/ExpandedControllerActivity.kt

@@ -0,0 +1,14 @@
+package com.michatec.radio
+
+import android.view.Menu
+import com.google.android.gms.cast.framework.CastButtonFactory
+import com.google.android.gms.cast.framework.media.widget.ExpandedControllerActivity
+
+class ExpandedControllerActivity : ExpandedControllerActivity() {
+    override fun onCreateOptionsMenu(menu: Menu): Boolean {
+        super.onCreateOptionsMenu(menu)
+        menuInflater.inflate(R.menu.expanded_controller, menu)
+        CastButtonFactory.setUpMediaRouteButton(this, menu, R.id.media_route_menu_item)
+        return true
+    }
+}

app/src/main/java/com/michatec/radio/PlayerFragment.kt

@@ -402,6 +402,7 @@ class PlayerFragment : Fragment(),
 
     /* Releases MediaController */
     private fun releaseController() {
+        controller?.removeListener(playerListener)
         MediaController.releaseFuture(controllerFuture)
     }
 

app/src/main/java/com/michatec/radio/PlayerService.kt

@@ -10,6 +10,7 @@ import android.os.CountDownTimer
 import android.util.Log
 import androidx.localbroadcastmanager.content.LocalBroadcastManager
 import androidx.media.MediaBrowserServiceCompat.BrowserRoot.EXTRA_RECENT
+import androidx.media3.cast.CastPlayer
 import androidx.media3.common.*
 import androidx.media3.common.util.UnstableApi
 import androidx.media3.datasource.HttpDataSource
@@ -45,6 +46,8 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
 
     /* Main class variables */
     private lateinit var player: Player
+    private lateinit var exoPlayer: ExoPlayer
+    private lateinit var castPlayer: CastPlayer
     private lateinit var mediaLibrarySession: MediaLibrarySession
     private lateinit var sleepTimer: CountDownTimer
     var sleepTimerTimeRemaining: Long = 0L
@@ -93,6 +96,8 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
         PreferencesHelper.saveIsPlaying(false)
         player.removeListener(playerListener)
         player.release()
+        exoPlayer.release()
+        castPlayer.release()
         mediaLibrarySession.release()
         // unregister preference change listener
         PreferencesHelper.unregisterPreferenceChangeListener(this)
@@ -134,7 +139,7 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
             }
         }
 
-        val exoPlayer: ExoPlayer = ExoPlayer.Builder(this, renderersFactory).apply {
+        exoPlayer = ExoPlayer.Builder(this, renderersFactory).apply {
             setAudioAttributes(audioAttributes, true)
             setHandleAudioBecomingNoisy(true)
             setLoadControl(createDefaultLoadControl(bufferSizeMultiplier))
@@ -147,7 +152,10 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
         exoPlayer.addAnalyticsListener(analyticsListener)
         exoPlayer.addListener(playerListener)
 
-        // manually add seek to next and seek to previous since headphones issue them and they are translated to next and previous station
+        // Initialize CastPlayer
+        castPlayer = CastPlayer.Builder(this).setLocalPlayer(exoPlayer).build()
+
+        // manually add seek to next and seek to previous since headphones issue them, and they are translated to next and previous station
         player = object : ForwardingPlayer(exoPlayer) {
             override fun getAvailableCommands(): Player.Commands {
                 return super.getAvailableCommands().buildUpon().add(COMMAND_SEEK_TO_NEXT)
@@ -543,7 +551,7 @@ class PlayerService : MediaLibraryService(), SharedPreferences.OnSharedPreferenc
 
 
     /*
-     * Custom LoadErrorHandlingPolicy that network drop outs
+     * Custom LoadErrorHandlingPolicy that network drop-outs
      */
     private val loadErrorHandlingPolicy: DefaultLoadErrorHandlingPolicy = object: DefaultLoadErrorHandlingPolicy()  {
         override fun getRetryDelayMsFor(loadErrorInfo: LoadErrorHandlingPolicy.LoadErrorInfo): Long {

app/src/main/java/com/michatec/radio/helpers/CollectionHelper.kt

@@ -638,15 +638,13 @@ object CollectionHelper {
         }.build()
         // build MediaMetadata
         val mediaMetadata = MediaMetadata.Builder().apply {
+            setTitle(station.name)
             setArtist(station.name)
-            //setTitle(station.name)
             
-            // Set artwork URI for casting (TV needs a public URL)
+            // Set artwork URI for casting (remote devices need a public URL)
-            val artworkUrl = station.remoteImageLocation.ifEmpty {
+            if (station.remoteImageLocation.isNotEmpty()) {
-                // Placeholder PNG image for stations without remote image
+                setArtworkUri(station.remoteImageLocation.toUri())
-                "https://raw.githubusercontent.com/google/material-design-icons/master/png/av/radio/materialicons/48dp/2x/baseline_radio_black_48dp.png"
             }
-            setArtworkUri(artworkUrl.toUri())
 
             /* check for "file://" prevents a crash when an old backup was restored */
             if (station.image.isNotEmpty() && station.image.startsWith("file://")) {
@@ -656,6 +654,7 @@ object CollectionHelper {
             }
             setIsBrowsable(false)
             setIsPlayable(true)
+            setMediaType(MediaMetadata.MEDIA_TYPE_RADIO_STATION)
         }.build()
         // build MediaItem and return it
         return MediaItem.Builder().apply {

app/src/main/res/menu/expanded_controller.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/media_route_menu_item"
+        android:title="@string/media_route_menu_title"
+        app:actionProviderClass="androidx.mediarouter.app.MediaRouteActionProvider"
+        app:showAsAction="always" />
+
+</menu>

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

@@ -27,4 +27,10 @@
         <!-- Don't show light status bar -->
         <item name="android:statusBarColor">@android:color/transparent</item>
     </style>
+
+    <style name="CustomCastExpandedControllerStyle" parent="CastExpandedController">
+        <item name="android:windowBackground">#FFFFFF</item>
+        <item name="castBackground">#FFFFFF</item>
+        <item name="castButtonColor">#FF495D92</item>
+    </style>
 </resources>

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

@@ -157,4 +157,5 @@
 
     <!-- Extras -->
     <string name="loading">Loading...</string>
+    <string name="media_route_menu_title">Cast</string>
 </resources>

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

@@ -74,4 +74,10 @@
         <item name="cornerSizeBottomRight">16dp</item>
         <item name="cornerFamilyBottomRight">rounded</item>
     </style>
+
+    <style name="CustomCastExpandedControllerStyle" parent="CastExpandedController">
+        <item name="android:windowBackground">#FFFFFF</item>
+        <item name="castBackground">#FFFFFF</item>
+        <item name="castButtonColor">#FF495D92</item>
+    </style>
 </resources>

build.gradle

@@ -7,5 +7,5 @@ plugins {
 }
 
 tasks.register('clean', Delete) {
-    delete rootProject.buildDir()
+    delete layout.buildDirectory
 }