What libraries are mainly used for Android applications?

Question

Android

Android has a lot of ways to work in a background thread. I know AsyncTask, Loaders, Handlers, Thread. But I don’t know which one, when to use it, and whether they are currently being used at all in development.
Heard about RxJava, is it a replacement for standard background work tools??
Also, for example Architectural components like: LiveData, PagingLibrary, ViewModel, Room, etc., is Android development moving to them??

Answer 1

None of this is used directly in modern development.
Rx or coroutines. If not, then some abstractions are still needed, otherwise death.

Answer 2

What's the question?
Use the tool of your choice.