Handler的简单应用1(实际上handler和Acitvity的onCreate是在同一线程内)

MainActivity：

package com.example.easyhandler;

import android.os.Bundle;
import android.os.Handler;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {

    private Button B1 = null;
    private Button B2 = null;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        B1 = (Button) this.findViewById(R.id.button1);
        B2 = (Button) this.findViewById(R.id.button2);

        B1.setOnClickListener(new startButtonListener());
        B2.setOnClickListener(new endButtonListener());
    }

    class startButtonListener implements OnClickListener {
        public void onClick(View v) {
            //执行消息队列里的线程
            handler.post(updateThread);
        }
    }

    class endButtonListener implements OnClickListener {
        public void onClick(View v) {
            //去除消息队列里面的线程
            handler.removeCallbacks(updateThread);
        }
    }

    //声明一个handler类，用于处理消息队列
    Handler handler = new Handler();
    //新建一个匿名内部类实现Runnable接口
    Runnable updateThread = new Runnable() {
        //重写run方法实现线程的执行内容
        public void run() {
            System.out.println("Come On Baby!");
            handler.postDelayed(updateThread, 2000);
        }
    };

    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

}