Kotlin открывает AlertDialog в элементе RecycleView, щелкает

У меня есть RecyclerView, я хочу открыть AlertDialog при нажатии элемента RecyclerView, я пытаюсь следовать концепции Этот вопрос на основе Java, но у меня это не сработало

Мой адаптер

class OperationAdapter (val context: Context,private val arrayList: ArrayList <Operations>):
RecyclerView.Adapter <OperationAdapter.Holder> () {

companion object {
    val TAG: String = OperationAdapter::class.java.simpleName
}

override fun onCreateViewHolder (parent: ViewGroup, viewType: Int): Holder {
    return Holder (LayoutInflater.from (parent.context ).inflate (R.layout.operaitemlist , parent, false))
}

override fun getItemCount (): Int = arrayList. size

override fun onBindViewHolder (holder: Holder, position: Int) {

    val opera = arrayList[position]
    holder.setData(opera, position)

}

inner class Holder (itemView: View): RecyclerView.ViewHolder (itemView) {

    private var currentOpera: Operations? = null
    private var currentPosition: Int = 0


    init {

        itemView.cardview.setOnClickListener {
            currentOpera?.let {

                AlertDialog.Builder(context)
                    .setTitle("My Title")
                    .setMessage("My Message")
                    .create()
                    .show()

            }
        }

        //the end of the init
    }

    //getting data from Operations and bind it into View
    fun setData(operation: Operations?, position: Int) {
        operation?.let {
            itemView.txtphonenumber.text = operation.phone
            itemView.txttime.text = operation.etime
        }

        this.currentOpera = operation
        this.currentPosition = position
    }
}

Настройте повторное использование

//set up the recycleview
    mRecyclerView.setHasFixedSize (true)
    mRecyclerView. layoutManager = LinearLayoutManager(this)

          //adapter
          val adapter = OperationAdapter(applicationContext,arrayList)
                        adapter.notifyDataSetChanged()
                        mRecyclerView.adapter = adapter

Пожалуйста, любое предложение