Cool. It's excellent that you wrote this!
As far as I know, the only other open-source app which can show bike-share data is MonTransit (Apache license 2.0). So you don't have a huge amount of competition.
A.) Some cities have e-bikes. Is your app able to show e-bike availability in any cities?
B.) Does your app support obsolete devices, such as my Moto G2 running Android 6.0 "Marshmallow"? :)