Call method from Kotlin class

Convert your class into an object which is supposed to work similarly to java static methods.

You can get more info here: https://kotlinlang.org/docs/reference/object-declarations.html#object-declarations

Sounds like MyToolbarUtils should be an object declaration instead of a class.

Another way would be to declare functions inside this class on the top level in a file (not inside any class) and just refer to them by their simple name.