Macroid is the most badass modular functional user interface creation language for Android, implemented with Scala macros. Some people say it’s also a dead noodle.
Striving to be focused on one thing (GUI), Macroid promotes composability, high-level abstractions and advanced features, like functional reactive programming.
Prerequisites: Scala 2.10.x or 2.11.x, Android API 9+.
Latest version: 2.0.0-M3 (installation | changelog).