RecyclerView OnScrollListener for Pagination support

PaginationScrollListener.java

public abstract class PaginationScrollListener extends RecyclerView.OnScrollListener {

    LinearLayoutManager layoutManager;

    public PaginationScrollListener(LinearLayoutManager layoutManager) {
        this.layoutManager = layoutManager;
    }

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

        int visibleItemCount = layoutManager.getChildCount();
        int totalItemCount = layoutManager.getItemCount();
        int firstVisibleItemPosition = layoutManager.findFirstVisibleItemPosition();

        if (!isLoading() && !isLastPage()) {
            if ((visibleItemCount + firstVisibleItemPosition) >= totalItemCount
                    && firstVisibleItemPosition >= 0
                    && totalItemCount >= getTotalPageCount()) {
                loadMoreItems();
            }
        }
    }

    protected abstract void loadMoreItems();

    public abstract int getTotalPageCount();

    public abstract boolean isLastPage();

    public abstract boolean isLoading();
}