recyclerviewName.addOnScrollListener(new RecyclerView.OnScrollListener() {            @Override            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {                super.onScrollStateChanged(recyclerView, newState);            }        int aa = 0;        @Override        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {            super.onScrolled(recyclerView, dx, dy);            aa = aa + dy;            if (aa < 700){                歌单顶栏.setBackgroundColor(Color.argb((int) 0, 0, 0, 0));                float percent = aa * 1f / 700;//百分比                int alpha = (int) (percent * 255);                歌单顶栏.setBackgroundColor(Color.argb((int) alpha, 161, 196, 253));            }else {                歌单顶栏.setBackgroundColor(Color.argb((int) 255, 161, 196, 253));            }        }    });

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