获取RecyclerView滑动的距离

private int getScollYDistance() {
LinearLayoutManager layoutManager = (LinearLayoutManager) mRecylerview.getLayoutManager();
int position = layoutManager.findFirstVisibleItemPosition();
View firstVisiableChildView = layoutManager.findViewByPosition(position);
int itemHeight = firstVisiableChildView.getHeight();
return (position) * itemHeight - firstVisiableChildView.getTop();
}