android之IntentService类的实现

package com.ghg.MyIntentService;import android.app.Service;import android.content.Intent;import android.os.Handler;import android.os.HandlerThread;import android.os.IBinder;import android.os.Looper;import android.os.Message;/** * IntentService类的精简版，在（main线程）activity启动下载服务类，把需要下载的资源路径传给service，在service中， * 创建handler对象和消息对象，工作进程，然后通过handler对象把消息发送到和handler绑定的消息队列中（工作线程中），下载任务， * 下载结束后，把本次的启动的service关闭； * @author gaohong * */public class MyIntentService extends Service {HandlerThread thread;Handler handler;/** * 初始化工作线程和handler */@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();thread=new HandlerThread("workThread");System.out.println("在"+Thread.currentThread().getName()+"线程中创建工作线程");thread.start();Looper looper=thread.getLooper();handler=new Handler(looper){@Overridepublic void handleMessage(Message msg) {// TODO Auto-generated method stubSystem.out.println("在"+Thread.currentThread().getName()+"中处理消息");onHandleIntent((Intent)msg.obj);stopSelf(msg.arg1);//下载结束后把该次的调用service结束}};}protected void onHandleIntent(Intent intent) {// TODO Auto-generated method stubString uri=intent.getStringExtra("uri");try {thread.sleep(3000);//相当于下载任务；} catch (InterruptedException e) {// TODO Auto-generated catch blocke.printStackTrace();}}/* * 创建消息，用handler发送 *  */@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {// TODO Auto-generated method stubMessage msg=Message.obtain();msg.obj=intent;msg.arg1=startId;System.out.println("在"+Thread.currentThread().getName()+"线程中发送消息");handler.sendMessage(msg);return super.onStartCommand(intent, flags, startId);}@Overridepublic void onDestroy() {// TODO Auto-generated method stubthread.quit();super.onDestroy();}@Overridepublic IBinder onBind(Intent intent) {// TODO Auto-generated method stubreturn null;}}

activity中的代码：

package com.ghg.MyIntentService;import android.app.Activity;import android.content.Intent;import android.os.Bundle;public class Day1305_MyIntentServiceActivity extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Intent intent=new Intent(this, MyIntentService.class);        intent.putExtra("uri", "http://192.168.1.162:8080/musiconline/musics/001.mp3");        startService(intent);    }}

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