绑定到android中的同一服务实例

我正在玩

MediaPlayer

。我希望在用户离开活动时播放音乐。但是，当我离开并返回活动时，看起来我没有绑定到同一个实例

这是我的代码：

public class MusicService extends Service {
        private NotificationManager mNM;

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

        @Override
        public void onCreate() {

        }

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

        @Override
        public void onDestroy() {
            // Cancel the persistent notification.

            // Tell the user we stopped.
            Toast.makeText(this, "destroyed", Toast.LENGTH_SHORT).show();
        }

        @Override
        public IBinder onBind(Intent intent) {
            return mBinder;
        }

        // This is the object that receives interactions from clients.  See
        // RemoteService for a more complete example.
        private final IBinder mBinder = new LocalBinder();

        public void showtoast(int i){
            Toast.makeText(this, "showtoast"+i, Toast.LENGTH_SHORT).show();
        }

        //Music player functions


        String path = "http://mp3stream";
        MediaPlayer mp;
        Boolean mpLoaded=false;
        public void play(){
            if(!mpLoaded){
                try {
                    mp=new MediaPlayer();
                    mp.setDataSource(path);
                    mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
                    mp.prepareAsync();
                    mp.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

                        public void onPrepared(MediaPlayer mp) {
                            mp.start();
                        }
                    });
                    mpLoaded=true;
                } catch (IllegalArgumentException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IllegalStateException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        public void pause(){
            if(mpLoaded){
                mp.stop();
                mpLoaded=false;
            }
        }
}

当我不离开活动时，它工作得很好，但是当我离开并且音乐仍在播放时，当我返回并单击“停止”时，什么也没有发生。当我按下播放按钮时，另一个流开始

调试器显示

mpLoaded

为false，即使我可以听到服务

我就是这样装订的

private MusicService mBoundService;
    private ServiceConnection mConnection = new ServiceConnection() {
        public void onServiceConnected(ComponentName className, IBinder service) {
            mBoundService = ((MusicService.LocalBinder)service).getService();
            mIsBound=true; 
            Toast.makeText(Main.this, "service connected", Toast.LENGTH_SHORT).show();
        }

        public void onServiceDisconnected(ComponentName className) {
            mBoundService = null;
            Toast.makeText(Main.this, "service disconnected", Toast.LENGTH_SHORT).show();
        }
    };

    void doBindService() {

        bindService(new Intent(getApplicationContext(), MusicService.class), mConnection, Context.BIND_AUTO_CREATE);
        mIsBound = true;
    }  

---

您是否在关闭事件处理程序（如活动的

onStop

）上解除与服务的绑定？如果是这样，服务将被解除绑定并销毁，而您仍在收听音乐的唯一原因是MediaPlayer仍处于活动状态。使用绑定服务，每次绑定和解除绑定时都会得到一个新实例

如果需要持久性服务实例，请使用。服务的生命周期将独立于任何绑定活动，您可以调用以结束服务实例