What codes can be used to create android apps?

Answer 1

Java + XML

Answer 2

If you mean programming languages, then Java would be the one to go for, however, other languages can be used in android too, like C++, Python, etc..

Answer 3

Mainly Java which have official SDK and framework but you can use it other languages like python, C#,C++ On the other hand you take in to consideration that for C++ you cannot use graphic framework which is base on java but you can have access to lower layer of functions (based on linux) through the NDK (native development kit) which is also official suported by android.You can also use third party SDKs and frameworks which are portable to any mobile systems like iOS,MS win10.These can have its own language approachs.

Answer 4

dunno
I am a noob at creating games such as android apps