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

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

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);
    }

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);
}

@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

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。

// 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

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);

}

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);
        }
    };
}

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();
    }

}