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);
  }
 }
}