This may be due to Android being limited by Java 6, but I find Java code to be so verbose that it hurts readability. Unnecessary try/catch/ignore just to close a resource, tons of factories, classes with static methods because you can't add the functionality to string, etc.

What weirds me out is that they didn't even consider Kotlin an option, since it is essentially a language so that you can code Java, but without the javaness.