如何绑定到正在运行的android服务？

我希望这更多的是代码问题，而不是其他问题，我希望有人可以帮助解决这个问题。

我还有其他使用 startService() 启动服务的代码，并且当调试器点击 DecoderService 的 onCreate() 函数时，我可以验证该服务是否已启动。

但是，bindService 永远不会绑定到正在运行的服务。这是一个异步调用，我必须等待某些事情完成吗？

public class ResultsActivity extends Activity {

protected void onResume() {
    // TODO Auto-generated method stub
    super.onResume();

    Intent decoderIntent = new Intent(this,DecoderService.class);
    _isBound = bindService(decoderIntent,mConnection,Context.BIND_AUTO_CREATE);
    _textView.start(_mBoundService);
}

private boolean _isBound = false;
private DecoderService _mBoundService;

private ServiceConnection mConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName className, IBinder service) {
        _mBoundService = ((DecoderService.LocalBinder)service).getService();
    }

    public void onServiceDisconnected(ComponentName className)
        _mBoundService = null;
    }
};
}

    public class DecoderService extends Service {


protected void onHandleIntent(Intent intent) {
    // TODO Auto-generated method stub
    _numCompleted = 5;
    _numTotal = 100;
}

protected int _numCompleted = 0;
protected int _numTotal = 0;


public void onCreate() {
    onHandleIntent(null);
}


@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 class LocalBinder extends Binder {
    DecoderService _ref = null;
    public LocalBinder()
    {
        _ref = DecoderService.this;
    }
    DecoderService getService() {
        return DecoderService.this;
    }

}
}

这是一个异步调用吗？ 必须等待某件事 完全的？

绑定尚未准备就绪，直到onServiceConnected()被称为你的ServiceConnection object.