public abstract class PaginationScrollListener extends RecyclerView.OnScrollListener {

    private int previousTotalItemCount = 0;
    private boolean loading = true;

    @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);
        //we don't interested in scroll up
        if (dy <= 0) {
            return;
        }

        LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
        int totalItemCount = layoutManager.getItemCount();
        int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();

        if (loading && totalItemCount > previousTotalItemCount) {
            loading = false;
            previousTotalItemCount = totalItemCount;
        }

        if (!loading && lastVisibleItemPosition == (totalItemCount - 1)) {
            loading = true;
            loadMore();
        }
    }

    public abstract void loadMore();
}