上拉加载的RecyclerView,可嵌套在SwipeRefreshLayout中实现下拉刷新
GridLayoutManagerfootViewheadVeiwGrid
LinearLayoutManagerfindLastVisibleView GridLayoutManagerviewGrid adapterviewrecyclerView
Viewv4NestedScrollingParentRecyclerView NestedScrollingChildSwipeRefreshLayoutSwipeRefreshLayout LayoutManagerfootView