我正在开发一个聊天应用程序，它可以显示附近的人。对于每个用户，我都会保存firestore中最后记录的lat和long。我正在将所有用户加载到一个recyclerview中，并希望一个textview显示登录用户和其他用户之间的距离。我可以加载到文本视图的距离，但距离是所有用户的方式。我为此尝试了许多不同的方法，但都不管用。有什么不对劲的建议吗？这是我的recyclerview和distance方法。

class UserItem(val user: User) : Item<ViewHolder>() {
    var thisUser = User()

    override fun getLayout(): Int {
        return R.layout.user_row
    }
    override fun bind(viewHolder: ViewHolder, position: Int) {
        fetchCurrentUser()
        viewHolder.itemView.tv_user_name.text = "${user.userName}, ${user.userAge}"
        viewHolder.itemView.tv_user_about.text = "\"${user.userInterest}\""
        viewHolder.itemView.tv_distance_from.text = getDistance(thisUser.lastLocationLat, thisUser.lastLocationLong,
        user.lastLocationLat, user.lastLocationLong)
        Picasso.get().load(user.userImageUrl).into(viewHolder.itemView.iv_user_photo_toolbar)
    }
    private fun fetchCurrentUser() {

        val uid = FirebaseAuth.getInstance().currentUser!!.uid
        val db = FirebaseFirestore.getInstance().collection("users").document(uid)
        db.get()
            .addOnSuccessListener { documentSnapshot ->
                if (documentSnapshot != null) {
                    thisUser = documentSnapshot.toObject(User::class.java)!!
                }
            }
    }
private fun getDistance(latOne: Double, longOne: Double, latTwo: Double, longTwo: Double): kotlin.String {
    val mallLoc = Location("")
    mallLoc.latitude = longOne
    mallLoc.longitude = latOne

    val userLoc = Location("")
    userLoc.latitude = longTwo
    userLoc.longitude = latTwo

    val distance = mallLoc.distanceTo(userLoc) / 1000

    return String.format(Locale.getDefault(), "%.2f", distance)
        .toString() + " km Away"
}

}

Thankful for any help.