Just implemented RecyclerView in my code, replacing ListView.
Everything works fine. The data is displayed.
But error messages are
This issue is because you are not adding any LayoutManager for your RecyclerView.
Another reason is because you are calling this code in a NonUIThread. Make sure to call this call in the UIThread.
The solution is only you have to add a LayoutManager for the RecyclerView before you setAdapter in the UI Thread.
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));