Everything I need to learn to develop Android app

Question

Explain me in details which programming language and what is used to create admin panel, backend server and everything to develop high quality Android apps.

Answer 1

Abhishek Yadav try using the search feature to avoid duplication.
https://www.sololearn.com/discuss/447092/?ref=app
https://www.sololearn.com/discuss/823823/?ref=app

Answer 2

Material Design Also

Answer 3

Things to learn:
Java
You need to learn how android studio works
How to use XML
Google firebase for backend