Sending value from activity to a kotlin class

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Android

Kotlin

I would like to send a value from Activity back to a Kotlin class. I would really appreciate your help!

What I have tried:

I tried doing something like this, but I get an exception (snippet of code in a Kotlin class):

private lateinit var main: MainActivity
var img = ""
...
img = main.str2

img - stands for value in a Kotlin class, main stands for Activity