aidl 中通过RemoteCallbackList 运用到的回调机制： service回调activity的方法

说明：我没有写实例代码，直接拿项目中的代码，有点懒了，这里我省略贴出两个aidl文件。

TtsService extends Service

[java] view
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private final RemoteCallbackList<ITtsCallback> mCallbacks

= new RemoteCallbackList<ITtsCallback>();

[java] view
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private final android.speech.tts.ITts.Stub mBinder = new Stub() {



public int registerCallback(String packageName, ITtsCallback cb) {

if (cb != null) {

mCallbacks.register(cb);

mCallbacksMap.put(packageName, cb);

return TextToSpeech.SUCCESS;

}

return TextToSpeech.ERROR;

}



public int unregisterCallback(String packageName, ITtsCallback cb) {

if (cb != null) {

mCallbacksMap.remove(packageName);

mCallbacks.unregister(cb);

return TextToSpeech.SUCCESS;

}

return TextToSpeech.ERROR;

}





public int speak(String callingApp, String text, int queueMode, String[] params) {

ArrayList<String> speakingParams = new ArrayList<String>();

if (params != null) {

speakingParams = new ArrayList<String>(Arrays.asList(params));

}

return this.speak(callingApp, text, queueMode, speakingParams);

}

[java] view
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private void dispatchProcessingCompletedCallback(String packageName) {

ITtsCallback cb = mCallbacksMap.get(packageName);

if (cb == null){

return;

}

//Log.i("TtsService", "TTS callback: dispatch started");

// Broadcast to all clients the new value.

final int N = mCallbacks.beginBroadcast();

try {

cb.processingCompleted();

} catch (RemoteException e) {

// The RemoteCallbackList will take care of removing

// the dead object for us.

}

mCallbacks.finishBroadcast();

//Log.i("TtsService", "TTS callback: dispatch completed to " + N);

}

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@Override

public void onDestroy() {

super.onDestroy();



// TODO replace the call to stopAll() with a method to clear absolutely all upcoming

// uses of the native synth, including synthesis to a file, and delete files for which

// synthesis was not complete.

stopAll();



// Unregister all callbacks.

mCallbacks.kill();

}

在activity中

[java] view
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mITtscallback = new ITtsCallback.Stub() {

public void processingCompleted() throws RemoteException {

if (listener != null) {

listener.onProcessingCompleted();

}

}

};



result = mITts.registerCallback(mPackageName, mITtscallback);

上面只是一个贴代码没有做任何说明，基本的意思我想大家也能通过代码来看懂。

[java] view
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// int N = mCallbacks.beginBroadcast();

// try {

// for (int i = 0; i < N; i++) {

// mCallbacks.getBroadcastItem(i).showResult(mSlot);

// }

// } catch (RemoteException e) {

// Log("" + e);

// }

// mCallbacks.finishBroadcast();

-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

上传一个写的工作中用到的demo

[java] view
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package com.pateo.aidl;



interface ICallback {



void showResult(String result);



}





package com.pateo.aidl;

import com.pateo.aidl.ICallback;



interface IMyService {



void init(String packageName,String slot);

void registerCallback(String packageName,ICallback cb);

void unregisterCallback(String packageName,ICallback cb);



}

[java] view
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package com.pateo.service;



import java.util.HashMap;



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 com.pateo.aidl.ICallback;

import com.pateo.aidl.IMyService;



public class VuiService extends Service {



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

private HashMap<String, ICallback> mCallbacksMap = new HashMap<String, ICallback>();

private String mSlot = "";

private String mPackageName = "";



@Override

public void onStart(Intent intent, int startId) {

super.onStart(intent, startId);

}



@Override

public IBinder onBind(Intent intent) {

return remoteBinder;

}



@Override

public void onDestroy() {

mHandler.removeMessages(0);

mCallbacks.kill();

super.onDestroy();

}



@Override

public boolean onUnbind(Intent intent) {

return super.onUnbind(intent);

}



public void onRebind(Intent intent) {

super.onRebind(intent);

}



private IMyService.Stub remoteBinder = new IMyService.Stub() {



@Override

public void init(String packageName,String slot) throws RemoteException {

mSlot = slot;

mPackageName = packageName;



//Ä£Ä⿪ʌÆô¶¯Ê¶±ð£¬ÕâÀïµÄ4000ºÁÃëÏ൱ÓÚžøÓèµÄʶ±ð¹ý³ÌµÄʱŒä£¬Õâžö¿ÉÒÔÔÚʶ±ðœá¹ûÀïÃæÈ¥µ÷ÓÃ

mHandler.sendEmptyMessageDelayed(0, 4000);

}



@Override

public void unregisterCallback(String packageName, ICallback cb) {

if (cb != null) {

mCallbacks.unregister(cb);

mCallbacksMap.remove(packageName);

}

}



//°üÃû×¢²áµÄ·œÊœ£¬ÕâÑùŸÍ±ÜÃâÁ˺ܶàÓŠÓÃ×¢²á¶ŒÈ¥»Øµ÷£¬ÕâÀïÍš¹ýÓŠÓÞøÓèµÄpackageNameÀŽÆ¥ÅäŸßÌå»Øµ÷ÄÄÒ»žöÓŠÓõÄcallback

@Override

public void registerCallback(String packageName, ICallback cb) {

if (cb != null) {

mCallbacks.register(cb);

mCallbacksMap.put(packageName, cb);

}

}

};



//ÕâÀïÍš¹ýÓŠÓÞøÓèµÄpackageNameÀŽÆ¥ÅäŸßÌå»Øµ÷ÄÄÒ»žöÓŠÓõÄcallback

private void dispatchProcessingCompletedCallback() {

ICallback cb = mCallbacksMap.get(mPackageName);

if (cb == null){

return;

}

final int N = mCallbacks.beginBroadcast();

try {

cb.showResult(mSlot);

} catch (RemoteException e) {

}

mCallbacks.finishBroadcast();

}



private Handler mHandler = new Handler() {

@Override

public void handleMessage(Message msg) {

dispatchProcessingCompletedCallback();

super.handleMessage(msg);

}

};

}

[java] view
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package com.pateo;



import com.pateo.service.VuiService;

import com.pateo.aidl.ICallback;

import com.pateo.aidl.IMyService;

import com.pateo.R;



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.Handler;

import android.os.IBinder;

import android.os.Message;

import android.os.RemoteException;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;



public class AppActivity extends Activity {



TextView tv;

IMyService myservice ;

String mResult ;



@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

tv = (TextView) findViewById(R.id.tv);



//Ä£Äâ°ŽmodeŒü

Button btn = (Button) findViewById(R.id.startBtn);

btn.setOnClickListener(new OnClickListener() {

@Override

public void onClick(View v) {

Intent intent = new Intent(AppActivity.this,VuiService.class);

bindService(intent, serviceConnection, Context.BIND_AUTO_CREATE);

}

});

}



private ServiceConnection serviceConnection = new ServiceConnection() {



@Override

public void onServiceDisconnected(ComponentName name) {

myservice = null;

}



@Override

public void onServiceConnected(ComponentName name, IBinder service) {

myservice = IMyService.Stub.asInterface(service);

try {

if(myservice != null){

myservice.registerCallback("com.pateo",mCallback);

myservice.init("com.pateo","ÖØÌý|»ØžŽ");//ΪÁËÓïÒô¿òŒÜœÓÊÕµœÕâЩŽÊºó°ÑÕâÁœžöŽÊ²åÈë²å²Û£¬ÕâÑùŸÍ¿ÉÒÔ·¶Î§Ð¡Ìážßʶ±ð

//ÕâÀﻹ¿ÉÒÔ×ö°ÑÒ»Œ¶ŽÊÌõÒ²·¢¹ýÈ¥£¬²åÈë²å²Û¡£

}

} catch (RemoteException e) {

}

}

};



/**

* serviceµÄ»Øµ÷·œ·š

*/

private ICallback.Stub mCallback = new ICallback.Stub() {



//µÈŽýʶ±ðœá¹ûÈ»ºóshow³öÀŽ

@Override

public void showResult(String result) {

try {

mResult = result;

Message msgget = Message.obtain();

msgget.what = 1;

mHandler.sendMessage(msgget);

} catch (Exception e) {

}

}

};



private Handler mHandler = new Handler() {



@Override

public void handleMessage(Message msg) {

super.handleMessage(msg);

switch (msg.what) {

case 1:

tv.setText("result : " + mResult);

break;

}

}

};



@Override

protected void onDestroy() {

unbindService(serviceConnection);

super.onDestroy();

}



}

来源：http://blog.csdn.net/jianguo_liao19840726/article/details/6729598