Holder.kt

class Holder(
        itemView: View,
        val people: List<Person>,
        val context: Context) : RecyclerView.ViewHolder(itemView),
        View.OnClickListener {

        val name: TextView = itemView.findViewById(R.id.list_name)
        val email: TextView = itemView.findViewById(R.id.list_email)
        val phone: TextView = itemView.findViewById(R.id.list_phone)

        init {itemView.setOnClickListener(this)}

        override fun onClick(v: View?) {
            val person = people[adapterPosition]
            val intent = Intent(context, UpdateFirestoreActivity::class.java)
            intent.putExtra("Person", person)
            context.startActivity(intent)
        }
    }