What are the parts of Java I actually need to know in-depth before starting Android development?

Question

I like to develop app fille manager ,camera app , keyboard app,mini games

Answer 1

You just need to know java fundermental how to create classes interfaces abstract classes most importantly understand how threading works that pretty much everything you need to understand then I,LL advice you to try out java fx just a bit to know how to work with gui but it not required

Answer 2

This guide outlines everything you'll need to know in-depth.
https://medium.com/mindorks/learning-android-development-in-2019-a-practical-guide-ddc71e008696

Answer 3

I highly recommend you switch to kotlin language and learn in-depth "just in time" when you will need something to develop what you want.

Answer 4

applets was removed from java

Answer 5

In java you have to be familiar with
1.java.applet
2.java.awt
3.javax.swing
4.java.awt.event
the 4th option tells you about keyboard mouse click foucus focuslost blur etc and all other events