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

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1. private final RemoteCallbackList<ITtsCallback> mCallbacks  
2.            = new RemoteCallbackList<ITtsCallback>();  

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1. private final RemoteCallbackList<ITtsCallback> mCallbacks            = new RemoteCallbackList<ITtsCallback>();  

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1. private final android.speech.tts.ITts.Stub mBinder = new Stub() {  
2.   
3.     public int registerCallback(String packageName, ITtsCallback cb) {  
4.         if (cb != null) {  
5.             mCallbacks.register(cb);  
6.             mCallbacksMap.put(packageName, cb);  
7.             return TextToSpeech.SUCCESS;  
8.         }  
9.         return TextToSpeech.ERROR;  
10.     }  
11.   
12.     public int unregisterCallback(String packageName, ITtsCallback cb) {  
13.         if (cb != null) {  
14.             mCallbacksMap.remove(packageName);  
15.             mCallbacks.unregister(cb);  
16.             return TextToSpeech.SUCCESS;  
17.         }  
18.         return TextToSpeech.ERROR;  
19.     }  
20.   
21.   
22.     public int speak(String callingApp, String text, int queueMode, String[] params) {  
23.         ArrayList<String> speakingParams = new ArrayList<String>();  
24.         if (params != null) {  
25.             speakingParams = new ArrayList<String>(Arrays.asList(params));  
26.         }  
27.         return this.speak(callingApp, text, queueMode, speakingParams);  
28.     }  

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1. 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);        }  

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1. private void dispatchProcessingCompletedCallback(String packageName) {  
2.     ITtsCallback cb = mCallbacksMap.get(packageName);  
3.     if (cb == null){  
4.         return;  
5.     }  
6.     //Log.i("TtsService", "TTS callback: dispatch started");   
7.     // Broadcast to all clients the new value.   
8.     final int N = mCallbacks.beginBroadcast();  
9.     try {  
10.         cb.processingCompleted();  
11.     } catch (RemoteException e) {  
12.         // The RemoteCallbackList will take care of removing   
13.         // the dead object for us.   
14.     }  
15.     mCallbacks.finishBroadcast();  
16.     //Log.i("TtsService", "TTS callback: dispatch completed to " + N);   
17. }  

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1. 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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1. @Override  
2. public void onDestroy() {  
3.     super.onDestroy();  
4.   
5.     // TODO replace the call to stopAll() with a method to clear absolutely all upcoming  
6.     // uses of the native synth, including synthesis to a file, and delete files for which  
7.     // synthesis was not complete.   
8.     stopAll();  
9.   
10.     // Unregister all callbacks.   
11.     mCallbacks.kill();  
12. }  

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1. @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

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1. mITtscallback = new ITtsCallback.Stub() {  
2.                 public void processingCompleted() throws RemoteException {  
3.                     if (listener != null) {  
4.                         listener.onProcessingCompleted();  
5.                     }  
6.                 }  
7.             };  
8.   
9.   result = mITts.registerCallback(mPackageName, mITtscallback);  

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1. mITtscallback = new ITtsCallback.Stub() {                public void processingCompleted() throws RemoteException {                    if (listener != null) {                        listener.onProcessingCompleted();                    }                }            };  result = mITts.registerCallback(mPackageName, mITtscallback);