1 package com.lsw;
2
3 import android.app.Activity;
4 import android.os.Bundle;
5 import android.os.Handler;
6 import android.os.Message;
7 import android.util.Log;
8 public class ThreadDemoActivity extends Activity {
9 private static final String TAG = "ThreadDemo";
10 private int count = 0;
11 private Handler mHandler = new MyHandler();
12 boolean stopThread=false;
13
14 private Runnable mRunnable = new Runnable() {
15
16 public void run() {
17
18 while (!stopThread)
19 {
20 count++;
21 try
22 {
23 Thread.sleep(2000);
24 }
25 catch (InterruptedException e)
26 {
27 // TODO Auto-generated catch block
28 e.printStackTrace();
29 }
30
31 //雖然Message的構造函數是public的，但是最好是使用Message.obtain( )或Handler.obtainMessage( )函數來獲取Message對象，因為Message的實現中包含了回收再利用的機制，可以提供效率。
32 Message message=mHandler.obtainMessage();
33 message.what=0;
34 message.obj=count;
35 mHandler.sendMessage(message);
36 }
37 }
38 };
39
40 @Override
41 public void onCreate(Bundle savedInstanceState) {
42 super.onCreate(savedInstanceState);
43 setContentView(R.layout.main);
44 //開啟子線程
45 new Thread(mRunnable).start();
46 }
47
48 protected void onDestroy() {
49 System.out.println("-----------onDestroy------");
50 stopThread=true;
51 super.onDestroy();
52 };
53
54 class MyHandler extends Handler{
55
56 @Override
57 public void handleMessage(Message msg)
58 {
59 // TODO Auto-generated method stub
60 Log.e(TAG, Thread.currentThread().getName() + " " +msg.obj);
61 setTitle("" +msg.obj);
62 }
63 }
64
65 }