StaggeredGridOnScroll.java

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

    int visibleItemCount = recyclerView.getChildCount();
    int totalItemCount = recyclerView.getAdapter().getItemCount();
    int[] positions = layoutManager.findFirstVisibleItemPositions(null);
    int firstVisibleItem = positions[1];

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