mRecycleView.setOnScrollListener(new RecyclerView.OnScrollListener(){

    //用来标记是否正在向最后一个滑动，既是否向下滑动

    boolean isSlidingToLast = false;

    @Override

    public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

        StaggeredGridLayoutManager manager = (StaggeredGridLayoutManager) recyclerView.getLayoutManager();

        // 当不滚动时

        if (newState == RecyclerView.SCROLL_STATE_IDLE) {

            //获取最后一个完全显示的ItemPosition

            int[] lastVisiblePositions = manager.findLastVisibleItemPositions(new int[manager.getSpanCount()]);

            int lastVisiblePos = getMaxElem(lastVisiblePositions);

            int totalItemCount = manager.getItemCount();

            // 判断是否滚动到底部

            if (lastVisiblePos == (totalItemCount -1) && isSlidingToLast) {

                //加载更多功能的代码

                Ln.e("howes right="+manager.findLastCompletelyVisibleItemPosition());

                Toast.makeText(getActivityContext(),"加载更多",0).show();

            }

        }

    }

    @Override

    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {

        super.onScrolled(recyclerView, dx, dy);

        //dx用来判断横向滑动方向，dy用来判断纵向滑动方向

        if(dy > 0){

            //大于0表示，正在向下滚动

            isSlidingToLast = true;

        }else{

            //小于等于0 表示停止或向上滚动

            isSlidingToLast = false;

        }

    }

});

private int getMaxElem(int[] arr) {

        int size = arr.length;

        int maxVal = Integer.MIN_VALUE;

        for (int i = 0; i < size; i++) {

            if (arr[i]>maxVal)

                maxVal = arr[i];

        }

        return maxVal;

}