(Android实战)ProgressDialog+Thread实现弹出进度条数据异步加载（配有效果图）



           

博客分类：
• Android

 

2 实现说明

 

   实现流程

 

  Step One 弹出进度条对话框

 

  Step Two 执行线程，在线程中实现数据的异步加载

 

  Step Three 在线程数据加载完成后，调用Handler并集合数据，更新界面

Java代码  

1. //添加异步操作    
2.              m_Dialog=ProgressDialog.show(m_context, "请等待...", "正在下载安装文件，请稍后...",true);  
3.              //mRegsiterHandler.sleep(100);  
4.              new Thread(new Runnable(){  
5.   
6.                     @Override  
7.                     public void run() {  
8.                    //加载数据  
9.                          result=0;  
10.                           try{  
11.                               //下载文件  
12.                               String url="http://00.00.00.00:80/nationaltest.html";  
13.                                 HttpClient client = new DefaultHttpClient();       
14.                               HttpGet get = new HttpGet(url);       
15.                               HttpResponse response;       
16.                                 
17.                               response = client.execute(get);       
18.                               HttpEntity entity = response.getEntity();       
19.                               long length = entity.getContentLength();       
20.                               InputStream is = entity.getContent();       
21.                               FileOutputStream fileOutputStream = null;       
22.                               if (is != null) {       
23.                                   File file = new File(Environment.getExternalStorageDirectory(), "nationaltest.apk");       
24.                                   fileOutputStream = new FileOutputStream(file);       
25.                                   byte[] buf = new byte[1024];       
26.                                   int ch = -1;       
27.                                   while ((ch = is.read(buf)) != -1) {       
28.                                       fileOutputStream.write(buf, 0, ch);       
29.                                   }       
30.                              }       
31.                              fileOutputStream.flush();       
32.                              if (fileOutputStream != null) {       
33.                                  fileOutputStream.close();       
34.                              }    
35.                              result=2;  
36.                           }  
37.                          catch(Exception ex){  
38.                              result=-1;   
39.                          }             
40.                           
41.                     //更新界面  
42.                          // Update the progress bar   
43.                          mHandler.post(new Runnable() {       
44.                              public void run() {                            
45.                                  if(result==2)  
46.                                       install();  
47.                                        else  
48.                                            Toast.makeText(m_context, "下载文件失败,请检查网络连接", Toast.LENGTH_SHORT).show();      
49.                                  }                    
50.                              });  
51.                           
52.                       
53.                      m_Dialog.dismiss();  
54.                     }}).start();  
55.                
56.               }