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

MainActivity：
 1 package com.example.easyhandler;
 2 
 3 import android.os.Bundle;
 4 import android.os.Handler;
 5 import android.app.Activity;
 6 import android.view.Menu;
 7 import android.view.View;
 8 import android.view.View.OnClickListener;
 9 import android.widget.Button;
10 
11 public class MainActivity extends Activity {
12 
13     private Button B1 = null;
14     private Button B2 = null;
15 
16     protected void onCreate(Bundle savedInstanceState) {
17         super.onCreate(savedInstanceState);
18         setContentView(R.layout.activity_main);
19 
20         B1 = (Button) this.findViewById(R.id.button1);
21         B2 = (Button) this.findViewById(R.id.button2);
22 
23         B1.setOnClickListener(new startButtonListener());
24         B2.setOnClickListener(new endButtonListener());
25     }
26 
27     class startButtonListener implements OnClickListener {
28         public void onClick(View v) {
29             //执行消息队列里的线程
30             handler.post(updateThread);
31         }
32     }
33 
34     class endButtonListener implements OnClickListener {
35         public void onClick(View v) {
36             //去除消息队列里面的线程
37             handler.removeCallbacks(updateThread);
38         }
39     }
40 
41     //声明一个handler类，用于处理消息队列
42     Handler handler = new Handler();
43     //新建一个匿名内部类实现Runnable接口
44     Runnable updateThread = new Runnable() {
45         //重写run方法实现线程的执行内容
46         public void run() {
47             System.out.println("Come On Baby!");
48             handler.postDelayed(updateThread, 2000);
49         }
50     };
51 
52     public boolean onCreateOptionsMenu(Menu menu) {
53         // Inflate the menu; this adds items to the action bar if it is present.
54         getMenuInflater().inflate(R.menu.activity_main, menu);
55         return true;
56     }
57 
58 }