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我在这里有一个问题，我在一个永不停止的应用程序的后台运行了一个音乐曲目，当我在我的主要活动类中添加 OnDestroy() 或 Pause() 时，在运行不在类中的应用程序时给我一个错误而且我不知道把它们放在哪里来主要控制音乐！

这是给我一个错误的代码：

mServ.pauseMusic();  
mServ.resumeMusic();
mServ.stopMusic();

主要活动：

private boolean mIsBound = false;
private MusicService mServ;

private ServiceConnection Scon = new ServiceConnection(){
    public void onServiceConnected(ComponentName name, IBinder  binder) {
            mServ = ((MusicService.ServiceBinder)binder).getService();
            }

    public void onServiceDisconnected(ComponentName name) {
        mServ = null;
    }

    };
    void doBindService(){
        bindService(new Intent(this,MusicService.class),
                Scon,Context.BIND_AUTO_CREATE);
        mIsBound = true;
    }

    void doUnbindService()
    {
        if(mIsBound)
        {
            unbindService(Scon);
            mIsBound = false;
        }
    }

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Intent music = new Intent();
    music.setClass(this,MusicService.class);
    startService(music);

和服务活动：

public class MusicService extends Service implements MediaPlayer.OnErrorListener {

private final IBinder mBinder = new ServiceBinder();
MediaPlayer mPlayer;
private int length = 0;

public MusicService(){}

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

}

@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return mBinder;
}

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

    mPlayer = MediaPlayer.create(this, R.raw.la);
    mPlayer.setOnErrorListener(this);

    if(mPlayer != null){

        mPlayer.setLooping(true);
        mPlayer.setVolume(100, 100);
    }

    mPlayer.setOnErrorListener(new OnErrorListener(){

        @Override
        public boolean onError(MediaPlayer mp, int what, int extra) {

            onError(mPlayer, what, extra);
            return true;
        }

    });
}

public int onStartCommand (Intent intent , int flags, int startId)
{
     mPlayer.start();
     return START_STICKY;
}

public void pauseMusic()
{
    if(mPlayer.isPlaying())
    {
        mPlayer.pause();
        length=mPlayer.getCurrentPosition();
        Toast.makeText(this, "Music is Paused", Toast.LENGTH_LONG).show();

    }
}

public void resumeMusic()
{
    if(mPlayer.isPlaying()==false)
    {
        mPlayer.seekTo(length);
        Toast.makeText(this, "Music is started", Toast.LENGTH_LONG).show();
        mPlayer.start();
    }
}

public void stopMusic()
{
    mPlayer.stop();
    Toast.makeText(this, "Music is stoped", Toast.LENGTH_LONG).show();
    mPlayer.release();
    mPlayer = null;
}

@Override
public void onDestroy ()
{
    super.onDestroy();
    if(mPlayer != null)
    {
    try{
     mPlayer.stop();
     mPlayer.release();
        }finally {
            mPlayer = null;
        }
    }
}

@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
    // TODO Auto-generated method stub

    Toast.makeText(this, "Music player failed", Toast.LENGTH_SHORT).show();
    if(mPlayer != null)
    {
        try{
            mPlayer.stop();
            mPlayer.release();
        }finally {
            mPlayer = null;
        }



    }

    return false;

}

}

代码基于此链接教程

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