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mDatabase = FirebaseDatabase.getInstance()
mPersonTable = mDatabase.getReference("Person")
btn_subscribe.setOnClickListener {
            progressBarStyle.visibility = ProgressBar.VISIBLE
                val valueEventListener = object : ValueEventListener {

                    override fun onCancelled(databaseError: DatabaseError) {}

                    override fun onDataChange(dataSnapshot: DataSnapshot) {
                        progressBarStyle.visibility = ProgressBar.INVISIBLE

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 implementation 'com.google.firebase:firebase-firestore:17.1.5'

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class PersonFirestoredapter(private val context: Context, 
                            private val people: List<Person>) :
                            RecyclerView.Adapter<PersonFirestoredapter.Holder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): Holder {
        val layoutInflater = LayoutInflater.from(context)
        val view = layoutInflater.inflate(R.layout.layout_list_subscribers,
            parent, false)
        return Holder(view, people, context)
    }

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var mPeople: ArrayList<Person> = ArrayList()
var mAdapter: PersonFirestoredapter = PersonFirestoredapter(this, mPeople)

var mRecyclerView: RecyclerView = findViewById(R.id.rv)
mRecyclerView.setHasFixedSize(true)
mRecyclerView.layoutManager = LinearLayoutManager(this)

var db: FirebaseFirestore = FirebaseFirestore.getInstance()

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db.collection("Person").get().addOnSuccessListener { query ->
            if (!query.isEmpty) {
                val list = query.documents

                for (d in list) {
                    val person: Person? = d.toObject(Person::class.java)
                  
                    if (person != null) {
                        person.id = d.id
                        mPeople.add(person)

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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)

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 db.collection("Person").document(personExtra.id!!).delete().addOnSuccessListener {
            "Person was deleted.".toast(this@UpdateFirestoreActivity)
            finish()
        }.addOnFailureListener { exception ->
            "Error: ${exception.message}".toast(this@UpdateFirestoreActivity)
 }

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var db: FirebaseFirestore = FirebaseFirestore.getInstance()

var personExtra = intent.getSerializableExtra("Person") as Person

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etName_firestore_update.text.append(personExtra.name)
etEmail_firestore_update.text.append(personExtra.email)
etPhone_firestore_update.text.append(personExtra.phone)

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db.collection("Person").document(personExtra.id!!)

                .update("name",etName_firestore_update.text)
                    
                .addOnSuccessListener {
                    "Updated Successful.".toast(this@UpdateFirestoreActivity)
                    finish()
                    startActivity(Intent(this, FirestoreListActivity::class.java))
                    progressBarStyle.visibility = ProgressBar.INVISIBLE
                }.addOnFailureListener { exception ->