Set OnItemClickListener on RecycleView Android Kotlin

activity.kt

private var listener = object : Adapter.OnItemClickListener {
        override fun onItemClick(hospital: DataClassWrapper.MapsHospital) {
            getHospitalDetails(hospital)
        }

    }
private var adapter = Adapter(hospitals, listener)

Adapter.kt

class Adapter(private var hospitalList: ArrayList<MapsHospital>,
                          private var listener: OnItemClickListener)
    : RecyclerView.Adapter<MapsHospitalAdapter.ViewHolder>() {

    interface OnItemClickListener {
        fun onItemClick(hospital: MapsHospital)
    }

    override fun onBindViewHolder(holder: ViewHolder?, position: Int) {
        holder?.bindView(hospitalList[position], listener)
    }

//     override fun getItemCount(): Int {
//         return hospitalList.size
//     }

//     override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): ViewHolder {
//         val v = LayoutInflater.from(parent?.context).inflate(R.layout.custom_list_item, parent, false)
//         return ViewHolder(v)
//     }

    class ViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        fun bindView(hospital: MapsHospital, listener: OnItemClickListener) {
            itemView.setOnClickListener { listener.onItemClick(hospital) }
        }
    }
}