需求背景 : 当轮胎压力过大时，轮胎变红并且闪烁

// 开始闪烁时调用
private void startFlash(ImageView iv) {
        iv.setVisibility(View.VISIBLE);
        AlphaAnimation animation = new AlphaAnimation(1, 0);
        animation.setDuration(1000);
        animation.setRepeatCount(-1);
        iv.setAnimation(animation);
        animation.start();
    }

// 停止闪烁时调用
private void stopFlash(ImageView iv) {
        iv.setVisibility(View.INVISIBLE);
        iv.clearAnimation();
    }