If it's like `A : RecyclerView.Adapter<out Recy...

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[ribesg]

If it's like A : RecyclerView.Adapter<out RecyclerView.ViewHolder>, you should be able to put an object of type A into a RecyclerView.Adapter<RecyclerView.ViewHolder> var, or maybe you need RecyclerView.Adapter<out RecyclerView.ViewHolder>