Kotlin issue “One type argument expected for class ExpandableRecyclerAdapter”

Question

Got problems with RecyclerAdapter ViewHolder

abstract class ExpandableRecyclerAdapter(private         


        

Answer 1

Kotlin does not allow generic types to be specified without providing generics unless you're referring to a non-instance member of the class. (static inner classes, ::class, companion methods). Since ViewHolder is an inner class its identity depends on the exact specification of its outer class when talking about the type itself.

This means you cannot refer to a generic ExpandableRecyclerAdapter.ViewHolder, you must specify the bounds in which the outer class lies as well. Changing it to ExpandableRecyclerAdapter<T>.ViewHolder should solve the issue.