輸出端切換器

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {     // Create a media session. NotificationCompat.MediaStyle     // PlayerService is your own Service or Activity responsible for media playback.     MediaSession mediaSession = new MediaSession(this, "PlayerService");      // Create a MediaStyle object and supply your media session token to it.     Notification.MediaStyle mediaStyle = new Notification.MediaStyle().setMediaSession(mediaSession.getSessionToken());      // Specify any actions which your users can perform, such as pausing and skipping to the next track.     Notification.Action pauseAction = Notification.Action.Builder(pauseIcon, "Pause", pauseIntent).build();      // Create a Notification which is styled by your MediaStyle object.     // This connects your media session to the media controls.     // Don't forget to include a small icon.     String CHANNEL_ID = "CHANNEL_ID";     Notification notification = new Notification.Builder(this, CHANNEL_ID)         .setStyle(mediaStyle)         .setSmallIcon(R.drawable.ic_app_logo)         .addAction(pauseAction)         .build(); }

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {     mediaSession.setMetadata(         new MediaMetadataCompat.Builder()         // Title         .putString(MediaMetadata.METADATA_KEY_TITLE, currentTrack.title)          // Artist         // Could also be the channel name or TV series.         .putString(MediaMetadata.METADATA_KEY_ARTIST, currentTrack.artist)          // Album art         // Could also be a screenshot or hero image for video content         // The URI scheme needs to be "content", "file", or "android.resource".         .putString(MediaMetadata.METADATA_KEY_ALBUM_ART_URI, currentTrack.albumArtUri)          // Duration         // If duration isn't set, such as for live broadcasts, then the progress         // indicator won't be shown on the seekbar.         .putLong(MediaMetadata.METADATA_KEY_DURATION, currentTrack.duration)          .build()     ); }

if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {     mediaSession.setPlaybackState(         new PlaybackStateCompat.Builder()             .setState(                  PlaybackStateCompat.STATE_PLAYING,                  // Playback position                 // Used to update the elapsed time and the progress bar.                 mediaPlayer.currentPosition.toLong(),                  // Playback speed                 // Determines the rate at which the elapsed time changes.                 playbackSpeed             )          // isSeekable         // Adding the SEEK_TO action indicates that seeking is supported         // and makes the seekbar position marker draggable. If this is not         // supplied seek will be disabled but progress will still be shown.         .setActions(PlaybackStateCompat.ACTION_SEEK_TO)         .build()     ); }

public class MyService extends Service {   private CastContext castContext;    @Override   protected void onCreate() {      castContext = CastContext.getSharedInstance(this);      castContext         .getSessionManager()         .addSessionManagerListener(sessionManagerListener, CastSession.class);   }    @Override   protected void onDestroy() {     if (castContext != null) {        castContext           .getSessionManager()           .removeSessionManagerListener(sessionManagerListener, CastSession.class);     }   } }

public class CastOptionsProvider implements OptionsProvider {     @Override     public CastOptions getCastOptions(Context context) {         ...         return new CastOptions.Builder()             ...             .setRemoteToLocalEnabled(true)             .build()   } }

public class MyService extends Service {     private CastContext castContext;     private SessionTransferCallback sessionTransferCallback;      @Override     protected void onCreate() {         castContext = CastContext.getSharedInstance(this);         castContext.getSessionManager()                    .addSessionManagerListener(sessionManagerListener, CastSession.class);         sessionTransferCallback = new MySessionTransferCallback();         castContext.addSessionTransferCallback(sessionTransferCallback);     }      @Override     protected void onDestroy() {         if (castContext != null) {             castContext.getSessionManager()                        .removeSessionManagerListener(sessionManagerListener, CastSession.class);             if (sessionTransferCallback != null) {                 castContext.removeSessionTransferCallback(sessionTransferCallback);             }         }     }      public static class MySessionTransferCallback extends SessionTransferCallback {         public MySessionTransferCallback() {}          @Override         public void onTransferring(@SessionTransferCallback.TransferType int transferType) {             // Perform necessary steps prior to onTransferred         }          @Override         public void onTransferred(@SessionTransferCallback.TransferType int transferType,                                   SessionState sessionState) {             if (transferType==SessionTransferCallback.TRANSFER_TYPE_FROM_REMOTE_TO_LOCAL) {                 // Remote stream is transferred to the local device.                 // Retrieve information from the SessionState to continue playback on the local player.             }         }          @Override         public void onTransferFailed(@SessionTransferCallback.TransferType int transferType,                                      @SessionTransferCallback.TransferFailedReason int transferFailedReason) {             // Handle transfer failure.         }     } }

public class MyActivity extends AppCompatActivity {   private CastContext castContext;   private SessionTransferCallback sessionTransferCallback;    @Override   protected void onCreate() {      castContext = CastContext.getSharedInstance(this);      castContext         .getSessionManager()         .addSessionManagerListener(sessionManagerListener, CastSession.class);      sessionTransferCallback = new MySessionTransferCallback();      castContext.addSessionTransferCallback(sessionTransferCallback);   }    @Override   protected void onDestroy() {     if (castContext != null) {        castContext           .getSessionManager()           .removeSessionManagerListener(sessionManagerListener, CastSession.class);       if (sessionTransferCallback != null) {          castContext.removeSessionTransferCallback(sessionTransferCallback);       }     }   }    public static class MySessionTransferCallback extends SessionTransferCallback {     public MySessionTransferCallback() {}      @Override     public void onTransferring(@SessionTransferCallback.TransferType int transferType) {         // Perform necessary steps prior to onTransferred     }      @Override     public void onTransferred(@SessionTransferCallback.TransferType int transferType,                                SessionState sessionState) {       if (transferType==SessionTransferCallback.TRANSFER_TYPE_FROM_REMOTE_TO_LOCAL) {         // Remote stream is transferred to the local device.          // Retrieve information from the SessionState to continue playback on the local player.       }     }      @Override     public void onTransferFailed(@SessionTransferCallback.TransferType int transferType,                                  @SessionTransferCallback.TransferFailedReason int transferFailedReason) {       // Handle transfer failure.     }   } }

public class MyActivity extends Activity {     private CastContext mCastContext;     private CastSession mCastSession;     private SessionManager mSessionManager;     private SessionManagerListener<CastSession> mSessionManagerListener =             new SessionManagerListenerImpl();     private Cast.Listener mCastListener = new CastListener();      private class SessionManagerListenerImpl implements SessionManagerListener<CastSession> {         @Override         public void onSessionStarting(CastSession session) {}         @Override         public void onSessionStarted(CastSession session, String sessionId) {             addCastListener(session);         }         @Override         public void onSessionStartFailed(CastSession session, int error) {}         @Override         public void onSessionSuspended(CastSession session, int reason) {             removeCastListener();         }         @Override         public void onSessionResuming(CastSession session, String sessionId) {}         @Override         public void onSessionResumed(CastSession session, boolean wasSuspended) {             addCastListener(session);         }         @Override         public void onSessionResumeFailed(CastSession session, int error) {}         @Override         public void onSessionEnding(CastSession session) {}         @Override         public void onSessionEnded(CastSession session, int error) {             removeCastListener();         }     }      private class CastListener extends Cast.Listener {          @Override          public void onDeviceNameChanged() {              if (mCastSession == null) {                  return;              }              CastDevice castDevice = mCastSession.getCastDevice();              String deviceName = castDevice.getFriendlyName();              // Update UIs with the new cast device name.          }     }      private void addCastListener(CastSession castSession) {         mCastSession = castSession;         mCastSession.addCastListener(mCastListener);     }      private void removeCastListener() {         if (mCastSession != null) {             mCastSession.removeCastListener(mCastListener);         }     }      @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         mCastContext = CastContext.getSharedInstance(this);         mSessionManager = mCastContext.getSessionManager();         mSessionManager.addSessionManagerListener(mSessionManagerListener, CastSession.class);     }      @Override     protected void onDestroy() {         super.onDestroy();         mSessionManager.removeSessionManagerListener(mSessionManagerListener, CastSession.class);     } }