RecyclerView-Guide
Article 1, Everything You Need to Know About RecyclerView
https://medium.com/proandroiddev/everything-you-need-to-know-about-recyclerview-577bf9248298
Article 2, Process Death & Orientation Change in RecyclerView
https://medium.com/proandroiddev/process-death-orientation-change-in-recyclerview-8f9c902e491b