Androidの多线程之更新ui（Thread+Handler+Message）

流程：

1.点击开始，显示进度对话框，启动线程，循环发送消息（1-100）

2.更新对话框中的进度，和标题栏的进度

3.到达最大进度值时，关闭对话框，标题栏显示更新完成

解析：

1.在主线程处理handler的消息，更新Ui

2.在其他线程里用主线程的handler不停发送消息

3.线程启动，发送消息

 1 package com.bvin.thread;
 2 
 3 import android.app.Activity;
 4 import android.app.ProgressDialog;
 5 import android.os.Bundle;
 6 import android.os.Handler;
 7 import android.os.Message;
 8 import android.util.Log;
 9 import android.view.View;
10 import android.view.Window;
11 import android.widget.Button;
12 import android.widget.TextView;
13 
14 public class MainrActivity extends Activity {
15     /** Called when the activity is first created. */
16     private Handler handler;
17     private ProgressDialog dialog;
18     
19     private TextView tv;
20     
21     @Override
22     public void onCreate(Bundle savedInstanceState) {
23         super.onCreate(savedInstanceState);
24         this.getWindow().requestFeature(Window.FEATURE_PROGRESS);
25         setContentView(R.layout.main);
26         setSecondaryProgress(10000); //设置副进度为10000
27         handler = new Handler(){
28 
29             @Override
30             public void handleMessage(Message msg) {
31                 // TODO Auto-generated method stub
32                 super.handleMessage(msg);
33                 Log.e("progress:", ""+msg.what);
34                 setTitle("更新--"+msg.what);
35                 setProgress(msg.what*100);
36                 if(msg.what==100){
37                     setProgressBarVisibility(false); // 执行完后使进度条隐藏
38                     dialog.dismiss();
39                     setTitle("更新完成");
40                 }
41             }
42             
43             
44         };
45         initViews();
46         
47     }
48     
49     private void initViews(){
50         
51         dialog= new ProgressDialog(MainrActivity.this);
52         dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
53         dialog.setMax(100);
54         Button bt = (Button)findViewById(R.id.bt);
55         bt.setOnClickListener(new View.OnClickListener() {
56             
57             @Override
58             public void onClick(View v) {
59                 // TODO Auto-generated method stub
60                 setProgressBarVisibility(true);
61                 dialog.show();
62                 exec();
63             }
64         });
65         
66         tv  = (TextView)findViewById(R.id.tv);
67         
68         
69         
70     }
71     
72     private void exec(){
73         
74         new Thread(new Runnable(){
75 
76             @Override
77             public void run() {
78                 // TODO Auto-generated method stub
79                 for(int i=0;i<=100;i++){
80                     
81                     handler.sendEmptyMessage(i);
82                 }
83             }
84             
85             
86         }).start();
87     }
88 }