Anyone built an Android App?

Sure thing.

You can find the links to both iPhone and Android apps links on my homepage at https://www.homesync.com/ .

There are some major things to take into consideration when building cordova/phonegap apps. Tweaking for performance was my major barrier, but once you get a hang of it, it's smooth sailing. The apps are powered by a codeigniter backend aswell.

Codeigniter is simply one of the tools you need to learn to be a successful developer. Always add more tools to your coding arsenal!