Java & android

Question

What are the most important things that we need to learn in java in order to start developping android applications?

Answer 1

you must start learning basic concept of java(object oriented programming and etc)
for example https://www.learnjavaonline.org
I prefer book to study. Perfect site where can buy books. https://www.packtpub.com/all?search=Java+for+android&offset=&rows=&sort=
in education is worth investing