相关疑难解决方法(0)

我正在向我添加浮动箭头,HorizontalScrollView这将让用户知道当前视图之外还有更多项目.

我需要的是如何判断View是否已滚动到最大值.你会想到这个方法getMaxScrollAmount()会给你这个 - 它没有,在我的代码中它给了我视图的宽度.去了解为什么.这是我的代码 - 简单明了:

    final ImageView leftArrow = (ImageView) toReturn.findViewById(R.id.leftArrow);
    final ImageView rightArrow = (ImageView) toReturn.findViewById(R.id.rightArrow);

    final HorizontalScrollView scrollView = (HorizontalScrollView) toReturn.findViewById(R.id.actionBarHoriztonalScroll);


    final GestureDetector gd = new GestureDetector(new SimpleOnGestureListener() {
        @Override
        public boolean onScroll(MotionEvent e1, 
                                MotionEvent e2, 
                                float distanceX, 
                                float distanceY) {
            if(scrollView.getScrollX() == 0) {
                leftArrow.setVisibility(View.GONE);
            } else {
                leftArrow.setVisibility(View.VISIBLE);
            }
            if(scrollView.getScrollX() == scrollView.getMaxScrollAmount() ||
                scrollView.getMaxScrollAmount() == 0) {
                rightArrow.setVisibility(View.GONE);
            } else {
                rightArrow.setVisibility(View.VISIBLE);
            }

            Log.v(ClientDetailsFragment.class.getSimpleName(), "max: " + scrollView.getMaxScrollAmount() +
                                                            "current: " …