Ask HN: Platform that requires Java == only requires JVM?

The Android mobile platform is supported only by JAVA? Correct me if i am wrong.

Anyway, what does that mean? That you can only program in Java for it or only that you need to compile to bytecode via the Java virtual machine?

So could I write apps in Jython, Scala or Clojure for sucha platform and that would be fine since they run on the JVM?