方法一

使用timer定时器

        Timer timer = new Timer();
        TimerTask timerTask = new TimerTask() {
            @Override
            public void run() {

            }
        };
        //每二秒执行一次TimerTask
        timer.schedule(timerTask,0,2000);  

方法二

使用Handler与Runnable

        final Handler handler = new Handler();
        Runnable runnable = new Runnable() {
            @Override
            public void run() {
                handler.postDelayed(this,2000);
            }
        };
        //每二秒执行一次Runnable
        handler.postDelayed(runnable,20000);
        handler.removeCallbacks(runnable);

CSDN地址：android 实现定时器的两个方法