Android 延时执行某任务

3种常用方法：

1.线程

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

2.延时器

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

3.Handler

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