黑马程序员 Android 简单加载一个dialog

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 //显示ProgressDialog  

                progressDialog = ProgressDialog .show(MainActivity.this, "提示", "加载中..." );  

                           

               

              //新建线程  

                new Thread(){  

                    @Override 

                    public void run () {  

                     

                      try {

                                                 Thread.sleep (3000 );//延迟3秒

                                         } catch (InterruptedException e) {

                                                 // TODO Auto-generated catch block

                                                e. printStackTrace();

                                         }  

                          

                        progressDialog.dismiss ();   //旋转进度不现实。

                       

                    }}. start();

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