How to extend from an InnerClass in kotlin

Question

Basically what I want is something like this in kotlin:

public class BindingViewHolder<T extends ViewDataBinding> extends RecyclerView.ViewHolder {}

//it should be:

public class BindingViewHolder<T: ViewDataBinding> :
       RecyclerView.ViewHolder() {}

I'm using extending java classes so I don't know if this is possible, Android Studio tell me that the type is expected but neither writing the type inside <> or inside () it works.

Answer 1

The RecyclerView.ViewHolder constructor requires an item view passed in:

public RecyclerView.ViewHolder (View itemView)

You have to pass a base class constructor parameter from derived class ie:

class BindingViewHolder<T : ViewDataBinding>(binding:T) 
    : RecyclerView.ViewHolder(binding.root)