ProgressDialog+Thread实现进度条异步加载

实现流程

1、弹出进度条对话框

2、 执行线程，在线程中实现数据异步加载

3、在线程数据加载完成后，调用Handler并集合数据，更新界面

实现功能代码例子：

//添加异步操作              

m_Dialog=ProgressDialog.show(m_context, "请等待...", "正在下载安装文件，请稍后...",true);
             //mRegsiterHandler.sleep(100);
             new Thread(new Runnable(){
                    @Override
                    public void run() {
                   //加载数据
                         result=0;
                          try{
                              //下载文件
                              String url="http://00.00.00.00:80/nationaltest.html";
                              HttpClient client = new DefaultHttpClient();     
                              HttpGet get = new HttpGet(url);     
                              HttpResponse response;   

                              response = client.execute(get);     
                              HttpEntity entity = response.getEntity();     
                              long length = entity.getContentLength();     
                              InputStream is = entity.getContent();     
                              FileOutputStream fileOutputStream = null;     
                              if (is != null) {     
                               File file = new File(Environment.getExternalStorageDirectory(), "nationaltest.apk"); 

                                  fileOutputStream = new FileOutputStream(file);     
                                  byte[] buf = new byte[1024];     
                                  int ch = -1;     
                                  while ((ch = is.read(buf)) != -1) {     
                                      fileOutputStream.write(buf, 0, ch);     
                                  }     
                             }     
                             fileOutputStream.flush();     
                             if (fileOutputStream != null) {     
                                 fileOutputStream.close();     
                             }  
                             result=2;
                          }
                         catch(Exception ex){
                             result=-1; 
                         }           

            //更新界面
                      
                         mHandler.post(new Runnable() {     
                             public void run() {                          
                                 if(result==2)
                                      install();
                                       else
                               Toast.makeText(m_context, "下载文件失败,请检查网络连接", Toast.LENGTH_SHORT).show();    
                                 }                  
                             });
  
                     m_Dialog.dismiss();
                    }}).start();
              }