AddOnScrollListener.java

addOnScrollListener(new OnScrollListener() {

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);

        if (getLayoutManager() instanceof LinearLayoutManager) {
            LinearLayoutManager layoutManager = (LinearLayoutManager) getLayoutManager();
            if (layoutManager.getOrientation() == LinearLayoutManager.VERTICAL) {
                totalItemsInView = layoutManager.getItemCount();
                changeHeightAccordingToScroll(recyclerView);
            }
        }
    }

    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
    }
});