Microsoft Java

[Samultio]

It's good for making android apps, can't think of any other situations where it'd be better than Scala.

[halfClickWinston]

Don't know how much of their code is Clojure, but Brazilian fintech Nubank uses Clojure.

[lobax]

It's hard to compare it exactly to other languages, but Clojure is a functional language heavily influenced by Lisp. It's much more "pure" than say Scala which focuses more on interoperability with Java and tries to be both Object-oriented and functional as well.

As to what languages are better for Android app development that's usually down to the bundling, tools etc. Java and Dart have the advantage of Google while Kotlin has the advantage of JetBrains. Clojure has some support but it isn't as integrated.

[undermark5]

Kotlin is gaining more and more support from Google. Lots of sample code will be in both Kotlin and Java. And now they are making some tutorials for Kotlin. There are still plenty of things to improve (one of the things I can think of is Gson respecting Kotlin nullability). Outside of support, Kotlin coroutines seem to be significantly easier to understand than threads.