Where can I find lessons for dummies about activity?

Question

Java

There are almost no lessons and information about activities on Android on the Internet. Where there are good courses on this topic for a teapot?

Answer 1

developer.alexanderklimov.ru/android/java/java.php
I'm currently studying this course, it tells very clearly, and smooths out the difficulties with cats :)

Answer 2

https://developer.android.com/
Don Griffiths, David Griffiths " Head First. Android Programming "