Ruboto : Develop Native Android Apps Using Ruby
Ruboto (JRuby on Android) is a framework and tool chain to develop native Android apps, using the Ruby language and libraries. Ruboto includes support libraries and generators for creating projects, classes, tests etc. It makes the complete APIs of Android, Java, and Ruby available to you using the Ruby language. You need to have a Ruby implementation installed to use Ruboto. Detailed instruction for setting up and using Ruboto is available on the project wiki.