Activity如何访问NotificationListenerService的方法？

Question

我有一个活动类,需要获取设备的当前中断过滤器设置.

因此,我有一个MyNotificationListenerService派生自NotificationListenerService 的类,并实现onInterruptionFilterChanged().

但是onInterruptionFilterChanged()只有在中断过滤器发生变化时才会调用.当我的应用程序启动时,我需要找出中断过滤器的当前值是什么.NotificationListenerService有一个方法getCurrentInterruptionFilter().

我的问题是:如何能MyActivity调用MyNotificationListenerService的getCurrentInterruptionFilter()时候,我的应用程序启动？

操作系统自动创建并启动MyNotificationListenerService,是否MyActivity可以获得该对象的句柄以便getCurrentInterruptionFilter()显式调用？如果没有,那么应该有什么通信机制MyActivity才能从中获得初始中断设置MyNotificationListenerService？

.

Answer 1

您想要从您的活动绑定到服务。Android 文档对此有详细说明：http://developer.android.com/guide/components/bound-services.html

下面是它如何工作的示例。

您的活动：

public class MyActivity extends Activity {

    private MyNotificationListenerService mService;
    private MyServiceConnection mServiceConnection;

    ...

    protected void onStart() {
        super.onStart();
        Intent serviceIntent = new Intent(this, MyNotificationListenerService.class);
        mServiceConnection = new MyServiceConnection();
        bindService(serviceIntent, mServiceConnection, BIND_AUTO_CREATE);
    }

    protected void onStop() {
        super.onStop();
        unbindService(mServiceConnection);
    }

    private class MyServiceConnection implements ServiceConnection {

        @Override
        public void onServiceConnected(ComponentName name, IBinder binder) {
            mService = ((MyNotificationListenerService.NotificationBinder)binder).getService();
        }

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

您的服务：

public class MyNotificationListenerService extends NotificationListenerService {

    ...

    private NotificationBinder mBinder = new NotificationBinder();

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

    public class NotificationBinder extends Binder {
        public MyNotificationListenerService getService() {
            return MyNotificationListenerService.this;
        }
    }
}