I can’t reach any class member from a nested class in Kotlin

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In Kotlin, nested classes cannot access the outer class instance by default, just like nested static classes can’t in Java.

To do that, add the inner modifier to the nested class:

class MainFragment : Fragment() {
    // ...

    inner class PersonAdapter() : RecyclerView.Adapter<ViewHolder>() {
        // ...
    }
}

Note that an inner class holds a reference to its containing class instance, which may affect the lifetime of the latter and potentially lead to a memory leak if the inner class instance is stored globally.

See: Nested classes in the language reference

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