handler使用（二）

HandlerThread类实现了Looper的循环处理消息的功能

package mars.handler;

import android.app.Activity;

import android.os.Bundle;

import android.os.Handler;

import android.os.HandlerThread;

import android.os.Looper;

import android.os.Message;

public class HandlerTest2 extends Activity {

 @Override

 protected void onCreate(Bundle savedInstanceState) {

  super.onCreate(savedInstanceState);

  setContentView(R.layout.main);

  //打印了当前线程的ID

  System.out.println("Activity-->" + Thread.currentThread().getId());

  //生成一个HandlerThread对象，实现了使用Looper来处理消息队列的功能，这个类由Android应用程序框架提供

  HandlerThread handlerThread = new HandlerThread("handler_thread");

  //在使用HandlerThread的getLooper()方法之前，必须先调用该类的start();

  handlerThread.start();

  MyHandler myHandler = new MyHandler(handlerThread.getLooper());

  Message msg = myHandler.obtainMessage();

  //将msg发送到目标对象，所谓的目标对象，就是生成该msg对象的handler对象

  Bundle b = new Bundle();

  b.putInt("age", 20);

  b.putString("name", "Jhon");

  msg.setData(b);

  msg.sendToTarget();

 } 

 //继承Handler类，

 class MyHandler extends Handler{

  public MyHandler(){   

  }

  public MyHandler(Looper looper){

   super(looper);

  }

  @Override

  public void handleMessage(Message msg) {

   Bundle b = msg.getData();

   int age = b.getInt("age");

   String name = b.getString("name");

   System.out.println("age is " + age + ", name is" + name);

  }

 }

}