I'm almost done with Ruby but now want to try my hands on Ruboto, ruby on android. Google failed to give me sufficient (almost no results).So can anyone please share some tutorials on Ruboto.
From the looks of it, Ruboto's own documentation is still under development! Ruboto's GitHub Wiki provides some tutorials and examples, but they're not totally complete. However, this may be enough to get you started. Be sure to read the README (which is also available on their GitHub Wiki):
https://github.com/ruboto/ruboto/blob/master/README.md
That should get you set up to go through their own tutorials:
https://github.com/ruboto/ruboto/wiki/Tutorials-and-examples
As Ivaylo Strandjev has already said, what you'll really need to learn to make apps with Ruboto is a sufficient knowledge of Ruby. From there, Ruboto is simply extending Ruby's capabilities to communicate with Android. Understanding how it does so is all you need!
You're right, though! There aren't a lot of tutorials, yet, because Ruboto is still a very early effort. Provided you have a good knowledge of Ruby, however, these tutorials and a thorough reading of Ruboto's documentation on GitHub should be more than enough to get your feet wet.
Happy Rubying!