Android 在服务中使用mediaplayer在后台播放视频

我正在开发一个可以播放youtube视频的应用程序，如果用户按下home（主页）按钮，用户可以听到音频，然后他们可以再次观看视频。 所以，我使用Mediaplayer和setDisplay surfaceview查看视频，但当按下home键时，它无法保持播放器播放，我知道该服务可以在后台执行长时间运行的操作，并且不提供用户界面。因此，我创建了一个包含Mediaplayer的服务

public class VideoPlayerService extends Service implements MediaPlayer.OnPreparedListener {

    private static final String TAG = "VideoPlayerService";

    public MediaPlayer mPlayer;

    public static int position;

    private final IBinder mBinder = new LocalBinder();

    @Override
    public IBinder onBind(Intent intent) {
       Log.d(TAG, "service in onBind");
       return mBinder;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mPlayer = new MediaPlayer();
        Log.d(TAG, "service created");
    }

    public class LocalBinder extends Binder {
        public VideoPlayerService getService() {
            return VideoPlayerService.this;
        }
    }

    @Override
    public int onStartCommand(final Intent intent, final int flags, final int startId) {
        return 1;
    }


    public IBinder onUnBind(final Intent arg0) {
        return null;
    }
}

我的活动绑定到它以获取服务实例，并将mediaplayer实例绑定到它的

setDisplay

surfaceview。但看起来，我可以

setDisplay

给mediaplayer，因为在我的活动离开

onCreate（）之前，服务实例不会返回

但是surface是通过活动即时创建的，我不能
设置Display
给mediaplayer显示视频，我如何才能克服这个问题，以下是我的活动：

public class VideoPlayerActivity extends Activity implements SurfaceHolder.Callback, MediaController.MediaPlayerControl, GetStreamUrlTest.IPlayerListener, MediaPlayer.OnPreparedListener {

static final String TAG = "VideoPlayerActivity";

public MediaController mMediaController;

public SurfaceView surfaceView;
public SurfaceHolder holder;

public VideoItem mVideoItem;

public int position = 0;

private VideoPlayerService mVideoPlayerService;

private boolean mBounded;

private ServiceConnection mServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
        VideoPlayerService.LocalBinder localBinder = (VideoPlayerService.LocalBinder)
                iBinder;
        mVideoPlayerService = localBinder.getService();
        mBounded = true;
        Log.d(TAG, "Service connected");

    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        Log.e(TAG, "Service has unexpectedly disconnected");
        mBounded = false;
    }
};

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.videoplayer);

    Log.d(TAG, "in Oncreate");

    mMediaController = new MediaController(this);
    mMediaController.setMediaPlayer(this);
    mMediaController.setAnchorView(surfaceView);

    Intent intent = getIntent();
    mVideoItem = (VideoItem) intent.getParcelableExtra(ConstantFields.VIDEO_ITEM);

    getWindow().setFormat(PixelFormat.UNKNOWN);
    surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
    holder = surfaceView.getHolder();
    holder.setFixedSize(800, 480);
    holder.addCallback(this);
    holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

@Override
protected void onStart() {
    super.onStart();
    Intent serviceIntent = new Intent(this, VideoPlayerService.class);
    bindService(serviceIntent, mServiceConnection, Context.BIND_AUTO_CREATE);
}

@Override
protected void onResume() {
    super.onResume();

}

@Override
protected void onStop() {
    super.onStop();
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (!mMediaController.isShowing()){
        mMediaController.show();
    } else {
        mMediaController.hide();
    }
    return false;
}

@Override
public void onBackPressed() {
    super.onBackPressed();
}

@Override
protected void onPause() {
    super.onPause();
}

@Override
protected void onDestroy() {
    super.onDestroy();
}

@Override
public void doPlayVideo(VideoItem videoItem){
    Log.d(TAG,"in DO Play");
    mVideoPlayerService.mPlayer.reset();
    try {
        mVideoPlayerService.mPlayer.setDataSource(this, Uri.parse(videoItem.getStreamUrl()));

        mVideoPlayerService.mPlayer.prepareAsync();
        mVideoPlayerService.mPlayer.setOnPreparedListener(this);

    } catch (IOException e) {
        e.printStackTrace();
    }
}

@Override
public void onPrepared(MediaPlayer mediaPlayer) {
    mVideoPlayerService.mPlayer.start();
}

@Override
public void surfaceCreated(SurfaceHolder surfaceHolder) {
    mVideoPlayerService.mPlayer.setDisplay(surfaceHolder);
    doPlay(mVideoItem)
    Log.d(TAG, "In surface Created");
}

@Override
public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i2, int i3) {
}

@Override
public void surfaceDestroyed(SurfaceHolder surfaceHolder) {
}
}

我只是将surfaceHolder作为类的字段存储在
surfaceCreated（surfaceHolder-surfaceHolder）
中，然后在创建服务时使用它。
很抱歉提出了一个愚蠢的问题，但我认为这段代码对任何想在服务中使用mediaplayer播放音频或视频的人都很有用
谢谢你的问题，我正在使用google exoplayer进行同样的工作。我应该就我的怀疑提出问题吗？