To become App Developer what should I learn after JAVA ?

Answer 1

1-for Android apps you should learn something like (Android Studio).

2-for ios apps you should learn something like (Swift).

3-for pc apps or something like this I personaly like to learn (Visual Basic 6).
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happy codding ^_^

Answer 2

Android Studio

Answer 3

https://hackernoon.com/tagged/android-app-development