播放/控制来自Android AppWidget的歌曲

Question

我创建了服务类来播放/暂停活动中的歌曲。但是我无法从AppWidget运行该服务，也无法像我在活动中处理的那样处理点击事件。非常感谢宝贵的意见/答案。谢谢。

服务类

public class MusicService extends Service implements MediaPlayer.OnPreparedListener, MediaPlayer.OnErrorListener,
    MediaPlayer.OnCompletionListener {
//media player
private MediaPlayer player;
//song list
private ArrayList<Song> songs;
//current position
private int songPosn;
//binder
private final IBinder musicBind = new MusicBinder();
@Nullable
@Override
public IBinder onBind(Intent intent) {
    Log.e("***", "MusicService - onBind");
    return musicBind;
}
@Override
public boolean onUnbind(Intent intent) {
    Log.e("***", "MusicService - onUnbind");
    player.stop();
    player.release();
    return false;
}
@Override
public void onDestroy() {
    Log.e("***", "MusicService - onDestroy");
    super.onDestroy();
}
@Override
public void onCreate() {
    super.onCreate();
    Log.e("***", "MusicService - onCreate");
    //initialize position
    songPosn = 0;
    //create player
    player = new MediaPlayer();
    //initialize
    initMusicPlayer();
}
public void initMusicPlayer() {
    //set player properties
    player.setWakeMode(getApplicationContext(),
            PowerManager.PARTIAL_WAKE_LOCK);
    player.setAudioStreamType(AudioManager.STREAM_MUSIC);
    //set listeners
    player.setOnPreparedListener(this);
    player.setOnCompletionListener(this);
    player.setOnErrorListener(this);
}
@Override
public void onCompletion(MediaPlayer mp) {
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
    return false;
}
@Override
public void onPrepared(MediaPlayer mp) {
    //start playback
    mp.start();
}
public void setList(ArrayList<Song> theSongs) {
    songs = theSongs;
}
public class MusicBinder extends Binder {
    public MusicService getService() {
        return MusicService.this;
    }
}
public void playSong() {
    //play a song
    player.reset();
    //get song
    Song playSong = songs.get(songPosn);
    //get id
    long currSong = playSong.getID();
    //set uri
    Uri trackUri = ContentUris.withAppendedId(
            android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
            currSong);
    //set the data source
    try {
        player.setDataSource(getApplicationContext(), trackUri);
    } catch (Exception e) {
        Log.e("MUSIC SERVICE", "Error setting data source", e);
    }
    player.prepareAsync();
}
public void stopSong() {
    player.stop();
    player.reset();
}
public void pauseSong() {
    player.pause();
}
public void resumeSong() {
    player.start();
}
public void setSong(int songIndex) {
    songPosn = songIndex;
}
}

应用小部件类

 public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    // There may be multiple widgets active, so update all of them
    for (int appWidgetId : appWidgetIds) {
        // Construct the RemoteViews object
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.new_app_widget);
   //            //views.setTextViewText(R.id.appwidget_text, String.valueOf(appWidgetId));
        // Create an Intent to launch ExampleActivity
  //            Intent intent = new Intent(context, MainActivity.class);
  //            PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
        Intent intent = new Intent(context, MusicService.class);
        PendingIntent pendingIntent = PendingIntent.getForegroundService(context, 0, intent, 0);
        // Get the layout for the App Widget and attach an on-click listener
        // to the button
        views.setOnClickPendingIntent(R.id.appwidget_text, pendingIntent);
        // Instruct the widget manager to update the widget
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }
}

Answer 1

您的服务已绑定，因此问题是您无法从 AppWidgetProvider 绑定到服务（因为它是底层的 BroadcastReceiver）。您已经在单击按钮时进行了挂起的意图，只需使此意图唯一，并确定现在在服务中的 onStartCommand（） 调用中正在执行的操作。

准备远程视图时：

Intent intent = new Intent(context, MusicService.class);
intent.setAction("TEXT_CLICK");
PendingIntent pendingIntent = PendingIntent.getForegroundService(context, 0, intent, 0);
views.setOnClickPendingIntent(R.id.appwidget_text, pendingIntent);

所以现在在 onStartCommand 中检查此操作，如下所示：

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if (intent == null || intent.getAction() == null) {
        return super.onStartCommand(null, flags, startId);
    }
    if (intent.getAction().equals("TEXT_CLICK")) {
       //make whatever you want (play/stop song, next/previous etc)
    }
    return super.onStartCommand(intent, flags, startId);
}