android 计时器

    class timeextends TimerTask implements Runnable{  
       public void run() {  
           System.out.println("开始倒计时2秒");
           Looper.prepare();
         //计数器加1
           Repeat_num++;
          
          //将字节输入管道并发送
          try {
               timer = new Timer();  
               timer.schedule(new callback(), 2000);
         } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
         }  
          Looper.loop();
       }  
       
       class callback extends TimerTask {  
           public void run() {  
              Looper.prepare();
               System.out.println("计时结束");
               //参数加1，表示是重发信息，在界面上不要再出现弹出式的提醒，搞成后台静默式发送
               try {
               clickOnAndroid_saveSendTo(1);
            } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
            }
               Looper.loop();
           }  
       }
    }

public class Calculation {  
      
    public static void calculate(int sleepSeconds){  
        try {  
            Thread.sleep(sleepSeconds * 1000);  
        } catch (Exception e) {  
            // TODO: handle exception  
        }  
    }