My first application in Android

Hello Community!

Esta es la version en ingles del post Mi primera aplicación en Android si hablas español puedes dar click aquí

I want to share my first app that I develop in Android, I develop this application in android studio with java.
The application, is a little calculator, this calculator can sum, subtraction, division, multiplicacion.

Actually, I'm learning Java for develop apps in android, but I investigate more and develop this application.
I want to learn Kotlin that is the new language for android.

This is the link of the repository Repository

See you later. Thanks for your time.

Screenshots of my phone and android studio