private int height = 620;// 滑动开始变色的高,真实项目中此高度是由广告轮播或其他首页view高度决定
private int overallXScroll = 0;

private void initHideShowTitle() {
    mBindingView.xRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            super.onScrolled(recyclerView, dx, dy);
            overallXScroll = overallXScroll + dy;// 累加y值 解决滑动一半y值为0
            if (overallXScroll <= 0) {   //设置标题的背景颜色  透明
                mBindingView.llTitle.setBackgroundColor(Color.argb((int) 0, 255, 255, 255));
            } else if (overallXScroll > 0 && overallXScroll <= height) { //滑动距离小于banner图的高度时，设置背景和字体颜色颜色透明度渐变
                float scale = (float) overallXScroll / height;
                float alpha = (255 * scale);
                mBindingView.llTitle.setBackgroundColor(Color.argb((int) alpha, 255, 255, 255));  由透明变白过程
            } else {
                mBindingView.llTitle.setBackgroundColor(Color.argb((int) 255, 255, 255, 255));    变到白色
            }
        }
    });
}