HandlerThread分线程启动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 MainActivity extends Activity{





	/** Called when the activity is first created. */

	@Override

	public void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		// 打印UI线程的名称

		System.out.println("onCreate  CurrentThread = "

				+ Thread.currentThread().getName());



		setContentView(R.layout.activity_main);



		// 实现了使用Looper来处理消息队列的功能

		HandlerThread handler = new HandlerThread("handler_Thread");

		handler.start();

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

		Message msg = myHandler.obtainMessage();

		msg.obj = "abc";

		Bundle data = new Bundle();

		data.putString("title", "你好吗");

		data.putString("info", "哈哈哈哈");

		msg.setData(data);

		// 将msg发送到对象，所谓的目标对象就是生成该msg对象的Handler对象

		msg.sendToTarget();



	}



	class MyHandler extends Handler {

		public MyHandler() {



		}



		public MyHandler(Looper looper) {

			super(looper);

		}



		@Override

		public void handleMessage(Message msg) {

			// TODO Auto-generated method stub

			String s = (String) msg.obj;

			Bundle data = msg.getData();

			String title=data.getString("title");

			String info=data.getString("info");   

            System.out.println("title is " + title + ", info is" + info);  

            System.out.println("msg.obj is " + s);  

			System.out.println(Thread.currentThread().getId());

			System.out.println("handlerMessage");

		}



	}

}

　　HandlerThread继承与Thread，所以本身就是一个线程。他类似于创建了一个含有Looper对象的线程类，而Looper可以用于创建Handler类，这样我们就不用自己实例化Looper对象，调用preare和Loop了，而是直接调用HandlerThread。与普通的Thread相比，就是多了Looper对象。