I have also been developing android and ios apps on idea bases let me know if you thinking about a great app, We can make it awesome together. If you have responsive website want to that in android app, i can help you in that too.
I will also provide you android source code and will give you tips how you can increase your android download and promote android app, along with publish app on google play and appstore.
Here are the android major features i'm experienced with.
Google Maps
Chatting Apps
Social connectivity,Events, Sports, Music
Camera Work
Sensor Work
REST APIs and Server Connectivity
Local Data Storage
Call SMS WebView
publish google play
In-App Purchases app
Custom Apps
and many more.