HandlerThread分线程启动handler

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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。