Yes, it says that in the announcement: > The object model of RubyMotion for Android is based on Java. Ruby classes, objects, methods and exceptions are Java cl

Yes, it says that in the announcement: > The object model of RubyMotion for Android is based on Java. Ruby classes, objects, methods and exceptions are Java classes, objects, methods and exceptions, and vice-versa. No bridge is involved. You're still coding to the same native APIs, but you're doing it in Ruby. That's how RubyMotion works on iOS/OSX as well as Android now.