How much Java do I need to know for Android?

Question

I started coding some Android Applications and it was easy till the activity and fragments. But now the new part like services and background recievers are getting me. So how much Java should I know? I know the basics but haven't studied threading Generics File input and output.

Answer 1

You have know also best for coding in android
Declarations and Access Control
Object Orientation
Assignments
Operators
Flow Control, Exceptions, and Assertions
Strings, I/O, Formatting, and Parsing
Generics and Collections
Inner Classes
But if you know already the basics ( classes, objects, inheritance, interfaces )
I think you're ok to start
Threads