You might want to check out Ruboto. I haven't used it yet, but it seems to allow you to do exactly what you want, i.e. write full Android apps using JRuby. I've

You might want to check out Ruboto. I haven't used it yet, but it seems to allow you to do exactly what you want, i.e. write full Android apps using JRuby. I've heard there's a significant performance penalty, though. http://ruboto.org/ http://ruboto.org/ I've also heard of people having success using Mirah to write Android apps. The syntax is very similar to Ruby, so it will be comfortable for you. It compiles to a straight Java class with no runtime dependencies, so you don't get the performance hit you run into with Ruboto. http://www.mirah.org/ http://www.mirah.org/