Using Groovy on Android
The original porting project is named discobot then some guys made a new project called discobot2 Afaik the first project had no runtime transformation of classes, but was able to run first Groovy programs on Android, with a very slow startup time. As for the second project the last to me known state is that they solved most issues and are now translating classes at runtime. But I never tried it out.
Update: since Groovy 2.4 a third version to run Groovy on Android is possible