user3124306 :
I am getting this error when I converted Java to Kotlin:
Java
public class HeaderTab extends ExpandableGroup {
private String header;
public HeaderTab(String title, List items) {
super(title, items);
}
}
Kotlin
class HeaderTab(title: String, items: List<*>) : ExpandableGroup<*>(title, items) {
private val header: String? = null
}
Android Studio says this:
projections are not allowed for immediate arguments of a supertype
What do I need to modify here?
Kiskae :
Use Any for a quick fix, or introduce a type parameter to make sure you don't break the type safety of the library.
class HeaderTab(title: String, items: List<*>) : ExpandableGroup<Any>(title, items) {
or
class HeaderTab<E>(title: String, items: List<E>) : ExpandableGroup<E>(title, items) {
The problem is that kotlin requires class types to be fully specified, so you can either specify a specific type as a type parameter or pass through a new type parameter.
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