Slide the receleview horizontally to the far right to listen to the page loading function

Close test available

thank ：https://www.jianshu.com/p/5eb2de368ea0 

public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener {

    //  Used to mark whether it is sliding to the left 
    private boolean isSlidingToLeft = false;

    @Override
    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
        super.onScrollStateChanged(recyclerView, newState);
        LinearLayoutManager manager = (LinearLayoutManager) recyclerView.getLayoutManager();
        //  When not sliding 
        if (newState == RecyclerView.SCROLL_STATE_IDLE) {
            //  Get the last fully displayed itemPosition
            int lastItemPosition = manager.findLastCompletelyVisibleItemPosition();
            int itemCount = manager.getItemCount();

            //  Judge if it's sliding to the last item, And it slides to the left 
            if (lastItemPosition == (itemCount - 1) && isSlidingToLeft) {
                //  Load more 
                onLoadMore();
            }
        }
    }

    @Override
    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
        super.onScrolled(recyclerView, dx, dy);
        // dx Greater than 0 Indicates that you are sliding to the left , Less than or equal to 0 Indicates sliding or stopping to the right 
        isSlidingToLeft = dx > 0;
    }

    /**
     *  Load more callbacks 
     */
    public abstract void onLoadMore();
}