使用android中的AIDL讓Service與Activity通信(service回調activity)

首先建立一個ICallback.aidl文件,作爲Activity中的回調方法

package com.zhang.test.service;
interface ICallback {
    void showResult(int result);
}

然後再建立一個IService.aidl用來在Activity中接收Service回調,以及在Service中onBind時返回的Binder
注意:aidl中import不能寫com.xxx.*,要寫全類的路徑

package com.zhang.test.service;

    import com.zhang.test.service.ICallback;

    interface IService {
            void registerCallback(ICallback cb);
            void unregisterCallback(ICallback cb);
    }

接下來是service:
MainService.java

package com.zhang.test.service;

    import android.app.Service;
    import android.content.Intent;
    import android.os.Handler;
    import android.os.IBinder;
    import android.os.Message;
    import android.os.RemoteCallbackList;
    import android.os.RemoteException;
    import android.util.Log;

    public class MainService extends Service {

        private static final String TAG = "MainService";

        private RemoteCallbackList<icallback> mCallbacks = new RemoteCallbackList<icallback>();

        private IService.Stub mBinder = new IService.Stub() {

            @Override
            public void unregisterCallback(ICallback cb){
                if(cb != null) {
                    mCallbacks.unregister(cb);
                }
            }

            @Override
            public void registerCallback(ICallback cb){
                if(cb != null) {
                    mCallbacks.register(cb);
                }
            }
        };

        @Override
        public IBinder onBind(Intent intent) {
            Log.d(TAG, "onBind");
            return mBinder;
        }

        @Override
        public void onCreate() {
            Log.d(TAG, "onCreate");
            //這裏不知道爲什麼,直接使用callback方法回調showResult
            //mCallbacks.beginBroadcast()是0,需要用handler延遲1000毫秒
            //也許是在activity中binService太耗時的原因?
             mHandler.sendEmptyMessageDelayed(0, 1000);
            super.onCreate();
        }

        @Override
        public void onDestroy() {
            mHandler.removeMessages(0);
            mCallbacks.kill();
            super.onDestroy();
        }

        private void callBack() {
            int N = mCallbacks.beginBroadcast();
            try {
                for (int i = 0; i < N; i++) {
                    mCallbacks.getBroadcastItem(i).showResult(i);
                }
            } catch (RemoteException e) {
                Log.e(TAG, "", e);
            }
            mCallbacks.finishBroadcast();
        }

        private Handler mHandler = new Handler() {

            @Override
            public void handleMessage(Message msg) {
                callBack();
                super.handleMessage(msg);
            }
        };
    }

然後是activity:

package com.zhang.test;

    import android.app.Activity;
    import android.content.ComponentName;
    import android.content.Context;
    import android.content.Intent;
    import android.content.ServiceConnection;
    import android.os.Bundle;
    import android.os.IBinder;
    import android.os.RemoteException;
    import android.util.Log;

    import com.zhang.test.service.ICallback;
    import com.zhang.test.service.IService;
    import com.zhang.test.service.MainService;

    public class MainActivity extends Activity {

        private static final String TAG = "MainActivity";

        private IService mService;

        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.main);
            Intent i = new Intent(this, MainService.class);
            bindService(i, mConnection, Context.BIND_AUTO_CREATE);
        }

        @Override
        protected void onDestroy() {
            if(mService!=null){
                try {
                    mService.unregisterCallback(mCallback);
                } catch (RemoteException e) {
                    Log.e(TAG, "", e);
                }
            }
            //destroy的時候不要忘記unbindService
             unbindService(mConnection);
            super.onDestroy();
        }

        /**
         * service的回調方法
         */
        private ICallback.Stub mCallback = new ICallback.Stub() {

            @Override
            public void showResult(int result) {
                Log.d(TAG, " result : " + result);
            }
        };

        /**
         * 註冊connection
         */
        private ServiceConnection mConnection = new ServiceConnection() {

            @Override
            public void onServiceDisconnected(ComponentName name) {
                Log.d(TAG, "onServiceDisconnected");
                mService = null;
            }

            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
                Log.d(TAG, "onServiceConnected");
                mService = IService.Stub.asInterface(service);
                try {
                    mService.registerCallback(mCallback);
                } catch (RemoteException e) {
                    Log.e(TAG, "", e);
                }
            }
        };
    }

最後不要忘記在manifest中加上service標記:

<service android:name=".service.MainService">
 </service>

轉帖：http://www.cnblogs.com/keis/archive/2011/05/13/2045673.html