Android 防止点击事件连按，isFastClick()

long lastClickTime;

    public synchronized boolean isFastClick() {
        long time = System.currentTimeMillis();
        if (time - lastClickTime < 500) {
            return true;
        }
        lastClickTime = time;
        return false;
    }

一个布尔方法，记录一下，备用~