Android服务未绑定

Question

@Override
protected void onStart(){
    super.onStart();
    Intent musicIntent = new Intent( this, MusicService.class );
    startService(musicIntent);
    getApplicationContext().bindService( musicIntent, mConnection, BIND_AUTO_CREATE);
}

private ServiceConnection mConnection = new ServiceConnection() {

    @Override
    public void onServiceDisconnected(ComponentName name) {
        mBound = false;
        mService = null;
    }

    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
        mBound = true;
        LocalBinder binder = (LocalBinder) service;
        mService = binder.getService();
        Log.d(TAG, "Bound");
    }
};

当我启动一个新活动时，我也想启动一个服务并将其绑定，以便可以使用该服务的某些方法。 在onStart（）方法中，我启动了服务并尝试将其绑定。 如您所见，绑定后它将在LogCat中向我显示。 但是，它永远不会！

该服务本身将始终被创建和启动（我在两个方法中都放置了一个Log.d(..) ）。

清单文件：

<service android:name="com.ppp.p.MusicService"></service>

怎么了？

编辑：

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

Answer 1

问题出在onBind()方法中。 为了绑定到服务，您需要在此处返回一个绑定器实例（不是null ），如此处所述 。

public class LocalService extends Service {
    // Binder given to clients
    private final IBinder mBinder = new LocalBinder();

    /**
     * Class used for the client Binder.  Because we know this service always
     * runs in the same process as its clients, we don't need to deal with IPC.
     */
    public class LocalBinder extends Binder {
        LocalService getService() {
            // Return this instance of LocalService so clients can call public methods
            return LocalService.this;
        }
    }

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

}

Answer 2

您将返回空的资料夹。 将此添加到您的服务。

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

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

private final IBinder mBinder = new LocalBinder();

文档链接： http : //developer.android.com/guide/components/bound-services.html#Binder