Android uses a thread timer

Handler

private Handler handler = new Handler();

Runnable

private Runnable runnable = new Runnable() {        @Override        public void run() {            this.upDate();            handler.postDelayed(this, 1000);        }        void upDate() {            setTime();        }    };

Set the time

private void setTime() {        //日期，api 24暂定        SimpleDateFormat formatter = new SimpleDateFormat("yyyy年  MM月  dd日   HH  :  mm  :  ss", Locale.getDefault());        String show_timeStr = formatter.format(new Date(System.currentTimeMillis()));        tv_clock1.setText(show_timeStr);    }

Start timing (recommended in OnCreate ())

handler.postDelayed(runnable, 1000);

Releasing threads (recommended in OnDestroy ())

handler.removeCallbacks(runnable);

Android uses a thread timer