Hi there,
First introduced myself am experience android developer, developed many applications and also published in play store also.
I saw your requirement website to Android app, this type of app is most familiar for me am already done many projects like this, if you want see my previous work means I will provide play store link.
For this application we need api work, we also write api's. I have well experience php developer also. I can develop this project with latest lollipop theme for below version also. So I can do this app with your expectations and in your budget.
Please contact me for further details am eagerly to do this project, thanks in advance.
Regards,
Vignesh