aidl服务与Activity的通讯

interface MyServiceBinder
{
    boolean startCaculate();
    boolean stopCaculate();

    //下面两个函数用来注册，注销回调函数

    boolean registerObserver(MyServiceObserver observer);

    boolean unregisterObserver();
}

interface MyServiceObserver
{
    notifyComplete(int result);
}

public class MyService extends Service
{
    //skip other function, just show the implements of interfaces defined in aidl file.

    private MyServiceObserver mObserver = null;
    private final MyServiceBinder.Stub mBinder =   new MyServiceBinder.Stub()

    {

        public void startCaculate()

        {

            int result;

            //Method should be implement

            if(mObserver != null)

                mObserver.notifyComplete(result);

        }

        public void stopCaculate()

        {

        }

        public void registerObserver(MyServiceObserver observer)

        {

            mObserver = observer;

        }

        public void unregisterObserver()

        {

            mObserver = null;

        }

    };  
}

public class MyActivity extends Activity
{
    private MyServiceBinder mServiceBinder;

    private MyServiceObserver mObserver = new MyServiceObserver.Stub()
    {
        public void notifyCompleted(int result)
        {
            Log.i("NOTICE", "Service returned result:"+result);
        }
    };

    private ServiceConnection mServiceConnection = new ServiceConnection()
    {
        public void onServiceConnected(ComponentName className, IBinder service)
        {
            mServiceBinder = MyServiceBinder.Stub.asInterface(service);
            mServiceBinder.registerObserver(mObserver);
        }

        public void onServiceDisconnected(ComponentName className)
        {
            mServiceBinder.unregisterObserver();
            mServiceBinder = null;
        }
    };
}