AIDL的简单使用

第一、定义AIDL文件

// IRemoteService.aidl
package com.example.android;

// Declare any non-default types here with import statements

/** Example service interface */
interface IRemoteService {
    /** Request the process ID of this service, to do evil things with it. */
    int getPid();

    /** Demonstrates some basic types that you can use as parameters
     * and return values in AIDL.
     */
    void basicTypes( int anInt, long aLong, boolean aBoolean, float aFloat,
            double aDouble, String aString);
}

这段代码也是官方文档的。命名为IRemoteService.aidl，放在com.example.android包下（这个可以随意），保存后Android编译器会在gen目录下自动生成IRemoteService.java文件 第二、定义我们的服务，DDService.java，并且需要在AndroidManifest.xml中注册，并添加“duanqing.test.aidl” 的ACTION

package com.example.service;

import com.example.android.IRemoteService;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.Process;

public class DDService extends Service {
    @Override
    public void onCreate() {
        super .onCreate();
        System.out.println( "DDService onCreate........" + "Thread: " + Thread.currentThread().getName());
    }
    @Override
    public IBinder onBind(Intent arg0) {
        System.out.println( "DDService onBind" );
        return mBinder;
    }

    private final IRemoteService.Stub mBinder = new IRemoteService.Stub() {
        public int getPid(){
            System.out.println( "Thread: " + Thread.currentThread().getName());
            System.out.println( "DDService getPid " );
            return Process.myPid();
        }
        public void basicTypes( int anInt, long aLong, boolean aBoolean,
            float aFloat, double aDouble, String aString) {
            System.out.println( "Thread: " + Thread.currentThread().getName());
            System.out.println( "basicTypes aDouble: " + aDouble + " anInt: " + anInt+ " aBoolean " + aBoolean+ " aString " + aString);
        }
    };

}

这样我们的服务端就完成了，把服务端运行到模拟器（或者手机上），等一会可以看一下打印信息，重点看“线程名” 
第三、实现客户端测试代码 新建另一个工程，同样需要添加AIDL协议文件（这是一个标准的协议文件，定义对外服务），这里我列出来我的测试代码：

package com.example.aidlclient;

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.Process;
import android.os.RemoteException;
import android.view.View;

import com.example.android.IRemoteService;

public class MainActivity extends Activity {
    private IRemoteService remoteService;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super .onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    ServiceConnection conn = new ServiceConnection() {

        @Override
        public void onServiceDisconnected(ComponentName name) {
        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            remoteService = IRemoteService.Stub.asInterface(service);
            try {
                int pid = remoteService.getPid();
                int currentPid = Process.myPid();
                System.out.println( "currentPID: " + currentPid + "  remotePID: " + pid);
                remoteService.basicTypes( 12 , 1223 , true , 12 .2f, 12.3 , "我们的爱，我明白" );
            } catch (RemoteException e) {
                e.printStackTrace();
            }
            System.out.println( "bind success! " + remoteService.toString());
        }
    };

    /**
     * 监听按钮点击
     * @param view
     */
    public void buttonClick(View view) {
        System.out.println( "begin bindService" );
        Intent intent = new Intent( "duanqing.test.aidl" );
        bindService(intent, conn, Context.BIND_AUTO_CREATE);
    }

    @Override
    protected void onDestroy() {
        super .onDestroy();
        unbindService(conn);
    }
}

4、执行 点击客户端按钮，执行，看打印信息：
看服务端打印，DDService onCreate..........Thread: main,主线程，当客户端调用服务端getPid方法时，服务端是在Thread: Binder2中执行，当客户端调用服务端basicType方法时，服务端是在Thread：Binder1中执行