update_.kt

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 ->
                    "Error: ${exception.message}".toast(this@UpdateFirestoreActivity)
                }