Android Recyclerview.adapter notifydatasetchanged does not work

I write in my own Recyclerview loading more, the last one step, this time the data has been loaded, the UI is not shown, and I also called the notifydatasetchanged Refresh item data, but has no effect, You must manually pull down to have the effect display item.

Workaround, directly on the code.

　　

Mrecyclerview.setlayoutmanager (Newlinearlayoutmanager (GetContext ()));
Mrecyclerview.setitemanimator (New Defaultitemanimator ());
Mrecyclerview.sethasfixedsize (TRUE);//The most important sentence
Mrecyclerview.addonscrolllistener (New Myscrolllistener ());
RecyclerView.Adapter.notifyItemInserted (GetItemCount ());//You must use this method to perform a recycleview refresh. (Refresh at the end)

　　

Android Recyclerview.adapter notifydatasetchanged does not work