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

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

//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
                         // Update the progress bar
                         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();

              }