since its rails I would think it should be easy for you to create an API and then use those endpoints to retrieve data from the rails app and into the Android a

since its rails I would think it should be easy for you to create an API and then use those endpoints to retrieve data from the rails app and into the Android app. This would mean a small amount of code on the Android side and some augmentation to how your rails app works, but its likely that your rails application already works alot like an API even if you didn't quite plan it that way by the nature of how rails lays things out for you.