如何监听RecyclerView划到最后一条数据

　　实现代码：

//RecyclerView的滑动监听mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {    //当RecyclerView滑动时触发    @Override    public void onScrolled(RecyclerView recyclerView, int dx, int dy) {        super.onScrolled(recyclerView, dx, dy);        //获取可见item个数        int lastVisibleItemPosition =                 linearLayoutManager.findLastVisibleItemPosition();        //说明是最后一条数据        if (lastVisibleItemPosition + 1 == adapter.getItemCount()) {            Snackbar.make(mRecyclerView, "一次只加载20条，查看更多请刷新哦。",                    Snackbar.LENGTH_SHORT).show();        }    }});