How to make a class available in all activities?

Question

Kotlin

There are a couple of features that are needed on almost every page. And I don’t want to prescribe onclicklistener on each activity class (what if I have to change?!).

Answer 1

Options are possible - implement methods in the base class and inherit from it, write extension functions, just write functions separately and use where necessary.
In general, little is known from the question. In the heading is the class, in the body of the function. What does the click listener have to do with it is also unclear.