Simple demo app with Java

I found amazing Android app code on github.
https://github.com/egeniq/android-tv-program-guide

This repository have the demo app code and EPG library with Kotlin, which means this code is built using Kotlin.
But I want the demo app with Java, not Kotlin, of course, you don't need to convert Kotlin library code fully.
I am wondering if you can convert demo app(Kotlin) to Java.
I hope you understand what I've said.
Thank you.