Start rails development environment on android
You might want to consider Rhodes. Rhodes is a Ruby MVC environment for building mobile apps for both Android and iOS. It's folder structure is not exactly like rails, but similar enough that it should be an easy transition.
Scripting Layer for Android (SL4A): http://code.google.com/p/android-scripting/
For Ruby specifically: http://code.google.com/p/android-ruby/
The idea of running Rails on Android devices is very appealing to me. However, I'm afraid it may not be easy or even possible at the moment.
Key requirement for developing Rails applications is having a Ruby interpreter on device. As for as I know, the only real candidates for this are:
- Having Scripting Layer for Android (SL4A) along with JRuby for Android, or alternatively
- Using Ruboto
After somehow getting the Ruby running, you still would need to figure out how to install and use RubyGems, Rails itself as well as all other libraries your web application may depend on (they may or may not work on Android).
As a summary, at this moment I would be rather looking into some alternatives. For instance, installing RoR on some remove machine and connecting to it from Android device with some SSH application.