timer计时

//计时2s消失
private void initTimer() {

    if (timer == null) {
        timer = new Timer();
    }

    if (timerTask == null) {
        timerTask = new TimerTask() {
            @Override
            public void run() {
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        countDown--;
                        if (countDown == 0) {
                            stopTimer();
                            tvFollow.setVisibility(View.GONE);

                            countDown = 2;
                        }
                    }
                });
            }
        };
    }

    if (timer != null && timerTask != null) {
        timer.schedule(timerTask, 500, 500);
    }
}

private void stopTimer() {
    if (timer != null) {
        timer.cancel();
        timer = null;
    }

    if (timerTask != null) {
        timerTask.cancel();
        timerTask = null;
    }
}