Android App to control RaspberryPI servos
It connects to a simple REST service (available here: https://github.com/varkenvarken/Point )
A bit more on these GitHub pages
No real installation instructions, haven't put the app in the appstore (and probably never will).
You can clone this directory and test the app in an emulator and then simply connect your real phone or tablet in developer mode and deploy it.
Connecting over https to a server with a self-signed certificate is not so straight forward and documented here https://github.com/varkenvarken/PointApp/blob/master/Doc/NetworkSecurity.md