简便的方法开线程干活并且出现等待提示

final ProgressDialog dialog = ProgressDialog.show(this, "Title", "Message", true);
final Handler handler = new Handler() {
   public void handleMessage(Message msg) {
      dialog.dismiss();
      }
   };
Thread checkUpdate = new Thread() {  
   public void run() {
//
// YOUR LONG CALCULATION (OR OTHER) GOES HERE
//
      handler.sendEmptyMessage(0);
      }
   };
checkUpdate.start();