Android 使用线程的计时器

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();
        }
    };

设置时间

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);
    }

启动计时(建议在onCreate()中)

handler.postDelayed(runnable, 1000);

释放线程(建议在onDestroy()中)

handler.removeCallbacks(runnable);