上拉刷新下拉加载

1.改造PullToRefreshRecyclerView

http://blog.youkuaiyun.com/anyfive/article/details/53036125

2.PullToRefreshRecyclerView——带上拉刷新下拉加载功能的RecyclerView

http://blog.youkuaiyun.com/a1533588867/article/details/54949058

    3.下拉刷新和上拉刷新都用SwipeRefreshLayout 自带的进度条

https://www.cnblogs.com/liunanjava/p/5860024.html

4.Xrecyclerview的使用（上拉刷新，下拉加载）

http://blog.youkuaiyun.com/mydtudysy/article/details/78322650

http://blog.youkuaiyun.com/liuwei522176950/article/details/50969048