How can companies use Erlang, Rust or Ada in Android Programming?

Question

I know, XML, Java and Kotlin are used commonly but how can WhatsApp and other companies use Erlang or other languages in Android Apps?

Answer 1

That's the power of Android, apps can made made using many languages. But the method for each language is different you have to study from different places for different languages

Answer 2

Erlang is kinda dying these days.