android实现多线程

package cd.edu.app;

import android.app.Activity;
import android.os.Bundle;
import android.os.HandlerThread;
import android.os.Message;
import cn.edu.subclass.MyHandler;

public class AndroidThreadActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        HandlerThread handThread=new HandlerThread("app");
        handThread.start();
        
        MyHandler myHand=new MyHandler(handThread.getLooper());
        Message msg=myHand.obtainMessage();
        msg.sendToTarget();
        
       System.out.println(Thread.currentThread().getName());
   
    }
    
  
}

package cn.edu.subclass;
import android.os.*;
public class MyHandler extends Handler{
	public MyHandler(Looper loop){
		super(loop);
	}
	public void handleMessage(Message message){
		System.out.println(Thread.currentThread().getName());
	}

}