What languages ​​can be written on Android?

Question

Java

Do I understand correctly that, in principle, it is possible to develop applications for android in any language that compiles into JVM bytecode? Any Jython, Groovy, Scala, Clojure and so on.
UPD: it turned out that it is possible, but there is one BUT: if java classes are already built into Android, then for other languages ​​they will have to be shoved into the application. But it is hardly necessary to use all the libraries at once in one application. I somehow came across tools that allow you to remove all unused libs from a Python project. Question - is there something similar for Jython, Clojure, Scala? Maybe for some / some of these languages ​​there are mobile application development environments - ideally, including such optimizing tools?

Answer 1

There is not the original JVM, but its implementation from Google, named Dalvik.
As far as I know, there have been some experiences with compiling Scala for Dalvik, but in fact the only language for Android development is Java

Answer 2

C++, Java, Python, Ruby, Js and so on.
Android development is not limited to one Java