This app was mentioned in 2 comments, with an average of 5.50 upvotes
There's a Kivy app in the Play Store called Barly that I think nicely illustrates what can and can't be done with Kivy. It's an attractive app that works well and has a useful interface with the camera. It also takes up almost 100mb of storage and takes about 12 seconds to start on my Moto G.
Slow startup times and large APKs are the big problems with Kivy and Android. The widgets don't look native, but they can be styled and it's entirely possible to create something very nice looking. And Kivy is relatively simple to work with. So it's great if you're OK with its limitations.
For those of you that are interested, the app is live for Android. Have a look here:
https://play.google.com/store/apps/details?id=org.topbanana.barly
Thanks!