Integral Step-by-Step Calculator on Android!

I write my first android application.

I used.. python!

You can write android application on python - use python framework kivy
(write a application supported on many operation systems: mac, windows, linux, android, ios, and sony play station and other)

So, my first android application - Integral Step-by-Step Calculator (link to google play)

This app calculate a integrals:

Offline Integral Step-By-Step Calculator (without online and internet):
* A indefinite integral
* A definite integral
* A improper integral