TimerTask运用技巧

来源：互联网发布：阿里云邀请码编辑：程序博客网时间：2024/04/28 07:58

1.利用timertask传递消息

TimerTask task = new TimerTask()   {      @Override      public void run()      {         if (isOnEvent)//flag         {            Message msg = LocationHandler.obtainMessage(1,"");            LxxHandler.sendMessage(msg);            isOnEvent=false;            if (dialog!=null && dialog.isShowing())            {               dialog.dismiss();            }         }              }   };   Timer timer = new Timer();   timer.schedule(task, 10000);//延迟1秒执行Handler LxxHandler = new Handler(){   @Override   public void handleMessage(Message msg)   {      // TODO Auto-generated method stub      if (msg.obj != null)      {         if (msg.what == 1)         {            Toast.makeText(m_Activity, "xx失败,请稍后重试！", Toast.LENGTH_LONG).show();         }                 }   }};

2、利用timerTask在指定时间执行指定任务（如后退键退出程序）

public boolean onKeyDown(int keyCode, KeyEvent event){   if (keyCode == KeyEvent.KEYCODE_BACK)   {      if (isQuit == false)      {         isQuit = true;         Toast.makeText(getBaseContext(), "再按一次返回键退出程序", Toast.LENGTH_SHORT).show();                  TimerTask task = new TimerTask()         {            @Override            public void run()            {               isQuit = false;            }         };         timer.schedule(task, 2000);//******超过2秒，isQuit变为false      }      else      {         SysApplication.getInstance().exit();//2秒内连续按两次以上，退出程序      }   }   return false;}

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