Android 三种延迟操作的实现方法

new Thread(new Runnable(){      public void run(){        Thread.sleep(XXXX);        handler.sendMessage();----告诉主线程执行任务      }   }).start   

 TimerTask task = new TimerTask(){      public void run(){      //execute the task       }    };    Timer timer = new Timer();  

new Handler().postDelayed(new Runnable(){     public void run() {     //execute the task     }    }, delay);