aidl的使用

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1. 定义一个AIDL接口

android工程目录下面创建一个.aidl扩展名的文件

// MyAIDLService.aidlpackage com.myservice;// Declare any non-default types here with import statementsinterface MyAIDLService {      int plus(int a, int b);      String toUpperCase(String str);}

2. 为远程服务（Service）实现对应Stub

package com.myservice;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;import android.os.RemoteException;import android.util.Log;/** * Created by 24720 on 2016/12/6. */public class MyService extends Service{    public static final String TAG = "MyService";    @Override    public void onCreate() {        super.onCreate();        Log.d(TAG, "onCreate() executed\n"+android.os.Process.myPid());    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        Log.d(TAG, "onStartCommand() executed");        return super.onStartCommand(intent, flags, startId);    }    @Override    public IBinder onBind(Intent intent) {        return mbinder;    }   MyAIDLService.Stub mbinder=new MyAIDLService.Stub() {       @Override       public int plus(int a, int b) throws RemoteException {           return a+b;       }       @Override       public String toUpperCase(String str) throws RemoteException {           if(str!=null){               return str.toUpperCase();           }           return null;       }   };    @Override    public void onDestroy() {        super.onDestroy();        Log.d(TAG, "onDestroy() executed");    }    class MyBinder extends Binder {        public void startDownload() {            Log.d("TAG", "startDownload() executed");            // 执行具体的下载任务        }    }}

在这里要注意Service是一个远程服务，在manifest的service里面加上 android:process=":remote" 就可以了，在MyService里面实现刚刚写的aidl接口，重写了plus和toUpperCase方法，这两个方法的作用分别是将一个字符串全部转换成大写格式，以及将两个传入的整数进行相加。然后在onBind()方法中将MyAIDLService.Stub的实现返回。这里为什么可以这样写呢？因为Stub其实就是Binder的子类，所以在onBind()方法中可以直接返回Stub的实现。
3. 将服务“暴露”给客户程序使用

package com.myservice;

import android.app.Activity;import android.content.ComponentName;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 android.view.View;import android.widget.Button;public class ServiceActivity extends Activity implements View.OnClickListener{    private Button bindService;    private Button unbindService;    private  MyAIDLService myAIDLService;    private String TAG="ServiceActivity";    private ServiceConnection connection=new ServiceConnection() {        @Override        public void onServiceConnected(ComponentName componentName, IBinder iBinder) {            myAIDLService=MyAIDLService.Stub.asInterface(iBinder);            try {                int result=myAIDLService.plus(3,6);                String str=myAIDLService.toUpperCase("hello word");                Log.e(TAG,"result----"+result+";-------"+str);            } catch (RemoteException e) {                e.printStackTrace();            }        }        @Override        public void onServiceDisconnected(ComponentName componentName   ) {        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_service);        Log.d("TAG", "process id is " + android.os.Process.myPid());        bindService = (Button) findViewById(R.id.bind_service);        unbindService = (Button) findViewById(R.id.unbind_service);        bindService.setOnClickListener(this);        unbindService.setOnClickListener(this);    }    @Override    public void onClick(View v) {        switch (v.getId()) {                  case R.id.bind_service:                          Intent bindIntent = new Intent(this, MyService.class);                          bindService(bindIntent,connection,BIND_AUTO_CREATE);                          break;                  case R.id.unbind_service:                      Log.d("MyService", "click Unbind Service button");                      unbindService(connection);                         break;                  default:                         break;                   }    }}

在这个界面要注意一个方法ServiceConnection,这里首先使用了MyAIDLService.Stub.asInterface()方法将传入的IBinder对象传换成了MyAIDLService对象，接下来就可以调用在MyAIDLService.aidl文件中定义的所有接口了。这里我们先是调用了plus()方法，并传入了3和6作为参数，然后又调用了toUpperCase()方法，并传入hello world字符串作为参数，最后将调用方法的返回结果打印出来。打印的结果com.myservice E/ServiceActivity: result----9;-------HELLO WORD，本文是看了郭林大神的贴子之后自己动手写的demo

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