如何使用Kotlin从Firestore中的数组字段中获取数据？

Question

我需要一些帮助来弄清楚如何从数组数据中的字段检索值。我想要每个字段中的布尔值，并在“ if”语句中使用它们，但无法找到方法。任何帮助将非常感激。最好使用kotlin示例。

这是我尝试用来更改图像的代码。

 internal class UserViewHolder(itemView: View) :
        RecyclerView.ViewHolder(itemView) {

        // Hold view refs
        private val usernameTextView: TextView = itemView.usernameTextView
        private val profileUserImage: CircleImageView = itemView.profileUserImage
        private val ratingBar: RatingBar = itemView.sProfileRatingBar
        private val haircutIcon: ImageView = itemView.haircutIcon
        private val waxingIcon: ImageView = itemView.waxingIcon
        private val nailIcon: ImageView = itemView.nailsIcon
        private val makeupIcon: ImageView = itemView.makeupIcon
        private val auth = FirebaseAuth.getInstance()
        private val customUserId = auth.uid.toString()
        val db = FirebaseFirestore.getInstance()
        private val userRef = db.collection("sUsers")





        internal fun bind(model: User) {
            model.apply {
                usernameTextView.text = fullname
                Picasso.get().load(profileImage).into(profileUserImage)
                ratingBar.setRating(model.totalrating)


                if (isHaircut){
                    haircutIcon.setImageResource(R.drawable.ic_profile_black_24dp)
                }else{
                    haircutIcon.setImageResource(R.drawable.profile)
                }
                if(isWaxing){
                    waxingIcon.setImageResource(R.drawable.ic_profile_black_24dp)
                }else{
                    waxingIcon.setImageResource(R.drawable.profile)
                }
                if(isMakeup){
                    makeupIcon.setImageResource(R.drawable.ic_profile_black_24dp)
                }else{
                    makeupIcon.setImageResource(R.drawable.profile)
                }
                if(isNails){
                    nailIcon.setImageResource(R.drawable.ic_profile_black_24dp)
                }else{
                    nailIcon.setImageResource(R.drawable.profile)
                }
            }
        }
    }