Hi friends please provide any reference for developing android apps using java.

Question

Android java

Answer 1

1- ftp://ftp.micronet-rostov.ru/linux-support/books/programming/Mobile-Apps/[Apress]%20-%20Learn%20Java%20for%20Android%20Development%20-%20[Friesen].pdf
2-https://archive.org/details/LearnJavaForAndroidDevelopment2ndEdition

Answer 2

Android Developers
https://developer.android.com

Answer 3

and consider learning kotlin too (that I'm trying to..)