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");
    }
};

当我开始一项新活动时，我也希望启动一项服务并将其绑定，以便我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绑定它。正如您所看到的那样，它会在LogCat中显示出来。但是，它永远不会！

将始终创建并启动服务本身（我在两种方法中都加了Log.d(..)。）

清单文件：

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

有什么问题？

编辑：

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

Answer 1

问题出在onBind()方法中。要绑定到服务，您需要在其中返回一个binder实例（不是null）作为described here。

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

您正在返回null绑定器。将此添加到您的服务中。

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

Android服务不绑定

2 个答案: