Move MediaRouter into Service

Author: dturner

app/src/main/java/com/example/android/uamp/MainActivity.kt

@@ -43,9 +43,6 @@ class MainActivity : AppCompatActivity() {
         InjectorUtils.provideMainActivityViewModel(this)
     }
     private var castContext: CastContext? = null
-    private lateinit var selector: MediaRouteSelector
-    private lateinit var router: MediaRouter
-
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -56,16 +53,6 @@ class MainActivity : AppCompatActivity() {
 
         setContentView(R.layout.activity_main)
 
-        router = MediaRouter.getInstance(this)
-        selector = MediaRouteSelector.Builder()
-            .addControlCategory(MediaControlIntent.CATEGORY_REMOTE_PLAYBACK)
-            .build()
-        router.routerParams = MediaRouterParams.Builder().setTransferToLocalEnabled(true).build()
-        router.addCallback(
-            selector, MediaRouterCallback(),
-            MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY
-        )
-
         // Since UAMP is a music player, the volume controls should adjust the music volume while
         // in the app.
         volumeControlStream = AudioManager.STREAM_MUSIC
@@ -133,20 +120,6 @@ class MainActivity : AppCompatActivity() {
     private fun getBrowseFragment(mediaId: String): MediaItemFragment? {
         return supportFragmentManager.findFragmentByTag(mediaId) as MediaItemFragment?
     }
-
-    private inner class MediaRouterCallback : MediaRouter.Callback() {
-        override fun onRouteSelected(
-            router: MediaRouter,
-            route: MediaRouter.RouteInfo,
-            reason: Int
-        ) {
-            if (reason == MediaRouter.UNSELECT_REASON_ROUTE_CHANGED) {
-                Log.d(TAG, "Unselected because route changed, continue playback")
-            } else if (reason == MediaRouter.UNSELECT_REASON_STOPPED) {
-                Log.d(TAG, "Unselected because route was stopped, stop playback")
-            }
-        }
-    }
 }
 
 private const val TAG = "MainActivity"

common/src/main/java/com/example/android/uamp/media/MusicService.kt

@@ -33,6 +33,10 @@ import android.widget.Toast
 import androidx.core.content.ContextCompat
 import androidx.media.MediaBrowserServiceCompat
 import androidx.media.MediaBrowserServiceCompat.BrowserRoot.EXTRA_RECENT
+import androidx.mediarouter.media.MediaControlIntent
+import androidx.mediarouter.media.MediaRouteSelector
+import androidx.mediarouter.media.MediaRouter
+import androidx.mediarouter.media.MediaRouterParams
 import com.example.android.uamp.media.extensions.album
 import com.example.android.uamp.media.extensions.flag
 import com.example.android.uamp.media.extensions.id
@@ -104,6 +108,10 @@ open class MusicService : MediaBrowserServiceCompat() {
 
     private lateinit var storage: PersistentStorage
 
+    private lateinit var mediaRouteSelector: MediaRouteSelector
+    private lateinit var mediaRouter: MediaRouter
+    private val mediaRouterCallback = MediaRouterCallback()
+
     /**
      * This must be `by lazy` because the source won't initially be ready.
      * See [MusicService.onLoadChildren] to see where it's accessed (and first
@@ -216,6 +224,18 @@ open class MusicService : MediaBrowserServiceCompat() {
         packageValidator = PackageValidator(this, R.xml.allowed_media_browser_callers)
 
         storage = PersistentStorage.getInstance(applicationContext)
+
+        mediaRouter = MediaRouter.getInstance(this)
+        mediaRouter.setMediaSessionCompat(mediaSession)
+        mediaRouteSelector = MediaRouteSelector.Builder()
+            .addControlCategory(MediaControlIntent.CATEGORY_REMOTE_PLAYBACK)
+            .build()
+        mediaRouter.routerParams =
+            MediaRouterParams.Builder().setTransferToLocalEnabled(true).build()
+        mediaRouter.addCallback(
+            mediaRouteSelector, mediaRouterCallback,
+            MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY
+        )
     }
 
     /**
@@ -250,6 +270,9 @@ open class MusicService : MediaBrowserServiceCompat() {
         // Free ExoPlayer resources.
         exoPlayer.removeListener(playerListener)
         exoPlayer.release()
+
+        // Stop listening for route changes.
+        mediaRouter.removeCallback(mediaRouterCallback)
     }
 
     /**
@@ -500,7 +523,10 @@ open class MusicService : MediaBrowserServiceCompat() {
                 } else {
 
                     val playbackStartPositionMs =
-                        extras?.getLong(MEDIA_DESCRIPTION_EXTRAS_START_PLAYBACK_POSITION_MS, C.TIME_UNSET)
+                        extras?.getLong(
+                            MEDIA_DESCRIPTION_EXTRAS_START_PLAYBACK_POSITION_MS,
+                            C.TIME_UNSET
+                        )
                             ?: C.TIME_UNSET
 
                     preparePlaylist(
@@ -650,6 +676,21 @@ open class MusicService : MediaBrowserServiceCompat() {
             ).show()
         }
     }
+
+    inner class MediaRouterCallback : MediaRouter.Callback() {
+        override fun onRouteSelected(
+            router: MediaRouter,
+            route: MediaRouter.RouteInfo,
+            reason: Int
+        ) {
+            if (reason == MediaRouter.UNSELECT_REASON_ROUTE_CHANGED) {
+                Log.d(TAG, "Unselected because route changed, continue playback")
+            } else if (reason == MediaRouter.UNSELECT_REASON_STOPPED) {
+                Log.d(TAG, "Unselected because route was stopped, stop playback")
+                currentPlayer.stop()
+            }
+        }
+    }
 }
 
 /*