Android学习笔记二十六.跨进程调用Service(AIDL Service)

package com.example.android_aidlservice;
import java.util.Timer;
import java.util.TimerTask;
import com.example.android_aidlservice.ICat.Stub;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.os.RemoteException;
public class AidlService extends Service {
 //1.声明一个IBinder对象、Timer对象
 private CatBinder catBinder;
 private Timer timer;
 //2.定义两个数组与两个私有变量
 private String color;
 private double weight;
 String[] colors = new String[]{"黑色","黄色","红色"};
 double[] weigths=new double[]{2.3,3.1,1.58};
 //3.继承stub,也就实现了ICat接口，并实现了IBinder接口
 public class CatBinder extends Stub
 {
  @Override
  public String getColor() throws RemoteException {
   return color;
  }
  @Override
  public double getWeight() throws RemoteException {
   return weight;
  }
 
 }
 //4.当Service创建时调用该方法
 @Override
 public void onCreate() {
  super.onCreate();
  //a.实例化一个CatBinder对象
  catBinder = new CatBinder();
  //b.该service完成的任务:随机地改变Service组件内color、weight属性的值
  timer.schedule(new TimerTask(){
   @Override
   public void run() {
    int rand=(int)(Math.random()*3);
    color=colors[rand];
    weight = weigths[rand];
    System.out.println("-----------"+rand);
   }
  }, 0, 800);
 }
 /*5.访问者使用bindService()方法启动Service时，该方法用于返回catBinder对象
  * (1)在绑定本地Service的情况下，该catBinder对象会直接传给客户端的ServiceConnection对象;
  * (2)在绑定远程Service的情况下，只将catBinder对象的代理传递给客户端的ServiceConnection对象的
  * onServiceConnection方法的第二个参数*/
 @Override
 public IBinder onBind(Intent intent) {
  return catBinder;
 }
 //6.回调该方法关闭Service
 @Override
 public void onDestroy() {
  timer.cancel();
 }
}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android_aidlservice"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <service android:name=".AidlService"
              android:exported="true">
            <intent-filter>
                <action android:name="com.example.service.AIDL_SERVICE"/>
            </intent-filter>
        </service>
    </application>
</manifest>

package com.example.android_aidl_service;
import android.app.Activity;
import android.app.Service;
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.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class AidlClient extends Activity {
 private ICat catService;	//声明一个ICat对象
 private Button get;
 private EditText color,weight;
 
 //1.创建一个ServiceConnection对象
 private ServiceConnection conn=new ServiceConnection(){
  @Override
  public void onServiceConnected(ComponentName name, IBinder service) {
   //获取远程Service的onBind方法的对象的代理
   catService = ICat.Stub.asInterface(service);
  }
  @Override
  public void onServiceDisconnected(ComponentName name) {
   catService=null;
  }
 };
 
 //2.绑定远程Service并获取其内容
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  //a.获取Activity主界面组件
  setContentView(R.layout.main);
  get=(Button)findViewById(R.id.get);
  color=(EditText)findViewById(R.id.color);
  weight=(EditText)findViewById(R.id.weight);
 
  //b.创建所需绑定的Service的Intent并设置其Action属性(即指定启动哪个远程Service)
  Intent intent=new Intent();
  intent.setAction("com.example.service.AIDL_SERVICE");
  //c.绑定并启动远程Service
  bindService(intent,conn,Service.BIND_AUTO_CREATE);
  //d.通过IBinder对象的代理获取远程Service数据
  get.setOnClickListener(new OnClickListener(){
   @Override
   public void onClick(View v)
   {
    try
    {
     color.setText(catService.getColor());
     weight.setText(catService.getWeight()+"");
    }
    catch (RemoteException e) {
     e.printStackTrace();
    }
   }
  });
 }
 //3.退出Activity时调用该方法，解除远程Service的绑定
 @Override
 protected void onDestroy() {
  super.onDestroy();
  this.unbindService(conn);
 }

}

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.android_aidl_service"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="19" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".AidlClient"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>