Unable to access variable from innerclass : Kotlin android

You should use the inner modifier in your adapter.

This modifier makes the inner class have access to the members of the outer class

Reference: https://kotlinlang.org/docs/reference/nested-classes.html

Define your nested class as inner then you will be able to access an outer class member variable.

class OuterClass{

var accessMe ="access me from Inner Class"

    inner class InnerClass{

       //....


        fun accessingOuterClassVariable(){

           accessMe = "Now the variable is accessed"

        }

    }

}