有人可以帮我解决Android RemoteControlClient吗？

我正在尝试RemoteControlClient设置,以便我的应用程序的音乐可以通过锁定屏幕上弹出的小部件(如SoundCloud,Google Play音乐和其他音乐/视频应用程序工作)进行控制.我不确定我的代码有什么问题以及为什么它没有正确挂钩,但这是我到目前为止所拥有的...

一个名为MusicService的类,它尝试处理RemoteControlClient的更新

public class MusicService extends Service
{
public static final String ACTION_PLAY = "com.stfi.music.action.PLAY";
private RemoteController controller = null;

@Override
public void onCreate()
{
    super.onCreate();

    System.out.println("Creating the service.");

    if(controller == null)
    {
        controller = new RemoteController();
    }
}

@Override
public int onStartCommand(Intent intent, int flags, int startId)
{
    String action = intent.getAction();
    System.out.println("Got an action of " + action);

           /* Logic to get my Song cur */
    controller.register(this);
    controller.updateMetaData(cur);

    return START_STICKY;
}

@Override
public void onDestroy()
{
    super.onDestroy();
    System.out.println("Destorying MusicService");
}

@Override
public IBinder onBind(Intent intent) {
    // TODO Auto-generated method stub
    return null;
}
}

它使用一类我称之为RemoteController里面有我的RemoteControlClient.

public class RemoteController { 
private RemoteControlClient remoteControlClient;
private Bitmap dummyAlbumArt;


public void register(Context context)
{
    if (remoteControlClient == null)
    {
        System.out.println("Trying to register it.");

        dummyAlbumArt = BitmapFactory.decodeResource(context.getResources(), R.drawable.dummy_album_art);

        AudioManager audioManager = (AudioManager) context.getSystemService(context.AUDIO_SERVICE);

        ComponentName myEventReceiver = new ComponentName(context.getPackageName(), MediaButtonReceiver.class.getName());
        audioManager.registerMediaButtonEventReceiver(myEventReceiver);

        // build the PendingIntent for the remote control client 
        Intent mediaButtonIntent = new Intent(Intent.ACTION_MEDIA_BUTTON);
        mediaButtonIntent.setComponent(myEventReceiver);
        // create and register the remote control client 
        PendingIntent mediaPendingIntent = PendingIntent.getBroadcast(context, 0, mediaButtonIntent, 0);
        remoteControlClient = new RemoteControlClient(mediaPendingIntent);
        remoteControlClient.setTransportControlFlags(RemoteControlClient.FLAG_KEY_MEDIA_PLAY_PAUSE
                | RemoteControlClient.FLAG_KEY_MEDIA_NEXT
                | RemoteControlClient.FLAG_KEY_MEDIA_PREVIOUS
                | RemoteControlClient.FLAG_KEY_MEDIA_PLAY
                | RemoteControlClient.FLAG_KEY_MEDIA_PAUSE
                );
        audioManager.registerRemoteControlClient(remoteControlClient);


    }
} 

/** 
 * Update the state of the remote control. 
 */ 
public void updateState(boolean isPlaying)
{
    if(remoteControlClient != null)
    {
        if (isPlaying)
        {
            remoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_PLAYING);
        }

        else
        { 
            remoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_PAUSED);
        } 
    } 
} 

/** 
 * Updates the state of the remote control to "stopped". 
 */ 
public void stop()
{ 
    if (remoteControlClient != null)
    {
        remoteControlClient.setPlaybackState(RemoteControlClient.PLAYSTATE_STOPPED);
    } 
} 

public void updateMetaData(Song song)
{
    if (remoteControlClient != null && song != null)
    {
        System.out.println("Updating metadata");
        MetadataEditor editor = remoteControlClient.editMetadata(true);
        editor.putBitmap(MetadataEditor.BITMAP_KEY_ARTWORK, dummyAlbumArt);
        editor.putLong(MediaMetadataRetriever.METADATA_KEY_DURATION, (long)1000);
        editor.putString(MediaMetadataRetriever.METADATA_KEY_ARTIST, "Artist");
        editor.putString(MediaMetadataRetriever.METADATA_KEY_TITLE, "Title");
        editor.apply();

        updateState(true);
    }
}

/** 
 * Release the remote control. 
 */ 
public void release() { 
    remoteControlClient = null;
} 
} 

每次我想要更新小部件时,我都会打电话startService(new Intent(MusicService.ACTION_PLAY));.看起来它正确地创建了服务,它总是达到"更新元数据"的程度,但出于某种原因,当我锁定屏幕并解锁时,我在锁定屏幕上看不到任何小部件.

以下是我的清单的重要部分,因为这可能以某种方式导致问题......

    

    
        
            

            
        

        
    
    ...other activities listed

    
    
    
        

            

        
        
            

            
        
    

    
    

现在我的MediaButtonReceiver并没有真正做很多事情.我只是想设置钩子.如果你愿意,这是我的MediaButtonReceiver类......

public class MediaButtonReceiver extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent)
{
    System.out.println("Receiving something.");
    if (intent.getAction().equals(Intent.ACTION_MEDIA_BUTTON))
    {
        final KeyEvent event = (KeyEvent) intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);

        if (event != null && event.getAction() == KeyEvent.ACTION_UP)
        {

            if (event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE)
            {
                System.out.println("You clicked pause.");
            }

            else if(event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PLAY)
            {
                System.out.println("You clicked play.");
            }

            else if (event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_NEXT)
            {
                System.out.println("You clicked next.");
            }

            else if (event.getKeyCode() == KeyEvent.KEYCODE_MEDIA_PREVIOUS)
            {
                System.out.println("You clicked previous.");
            }
        }
    }
}

}