使用android中的AIDL让Service与Activity通信(service回调activity)

这几天搞了搞AIDL,终于弄明白了在AIDL中让Service调用Activity的方法
代码:

首先建立一个ICallback.aidl文件,作为Activity中的回调方法

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

然后再建立一个IService.aidl用来在Activity中接收Service回调,以及在Service中onBind时返回的Binder
注意:aidl中import不能写com.xxx.*,要写全类的路径

package com.zhang.test.service;      import com.zhang.test.service.ICallback;      interface IService {             void registerCallback(ICallback cb);             void unregisterCallback(ICallback cb);     }

接下来是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");             //这里不知道为什么,直接使用callback方法回调showResult             //mCallbacks.beginBroadcast()是0,需要用handler延迟1000毫秒             //也许是在activity中binService太耗时的原因?              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);            }         };     }     </icallback></icallback>

然后是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的时候不要忘记unbindService              unbindService(mConnection);             super.onDestroy();         }          /**          * service的回调方法          */         private ICallback.Stub mCallback = new ICallback.Stub() {              @Override             public void showResult(int result) {                 Log.d(TAG, " result : " + result);             }         };         /**          * 注册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);                 }             }         };     }

最后不要忘记在manifest中加上service标记:

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