Answer 1

You can go to Ruboto.com, or a paid one with a free trial at RubyMotion.com

Alternatively this can be done:

1.) Compile Ruby and Nodejs for android

2.) Install on device and configure with c/c++ ide (You can use C4droid,CCTools,Terminal IDE.... for installing the expansion modules on с/с++)

3.) Install rails ($gem install rails)

You could do this, but there would be some significant limitations. You'll almost certainly need a rooted Android device.

For instance, you wouldn't be able to just gem install anything and have it work. The problem is, the phone is too resource-limited to run a compiler, so you can't compile either Ruby, or any gem that needs native libraries.

So the first way I'd go about this would be to cross-compile ruby and RubyGems with the Android NDKand then side-load them onto the device.

At this point you've got rubyand gem and can start experimenting.