What are the stuffs to learn before stepping into Android App Development??

Kotlin will do

@dontPanic I'm good with Java

@oseba HAHAHAHA
#Savage

Patience. Once that thing starts downloading 50GB of SDKs you're gonna need a lot of it.

@deadlyRants I've already downloaded it.

@oseba @deadlyRants Sdk's

Learn PROPER Java(recommended all the inner workings, features, Java 8-9, annotations, reflections, best practive, design patterns etc).
Kotlin is also a big plus but not required. Also be familiar with SQL, JSON schemas, REST, MVC/MVP/MVVM, Rxjava.

Learn how Android works as an OS. Learn the components work with eachother, ART/Dalvik, permissions etc.

Learn about Material Design and how to use design tools.

Optional but highly recommended- Learn how to build backend in Python/Node.js/Ruby, and use cloud services

@Chlodovechus Thank you

Learn Kotlin.. Life will be much easier if you start now directly with kotlin.. And yeah have a good base in java but dont make it your primary language cz java gonna leave the android realm real soon.

@htlr Mm..

@htlr
Kotlin doesn't feel 100% ready yet.
Maybe in 1-2 years

@Chlodovechus I prefer Java

@Chlodovechus yup, for a beginner I think its enough to play around. But yes, he need to have a solid foundation in java first.