RecyclerView.kt

override fun onBindViewHolder(holder: ViewHolder, position: Int) {
    holder.apply {
        checkBox.isChecked = position == mCheckedPosition
        checkBox.setOnClickListener { 
            if(position == mCheckedPosition) {
                checkBox.isChecked = false
                mCheckedPosition = -1
            } else {
                mCheckedPosition = position
                notifyDataSetChanged()
            }
        }
    }
}