<Why documentt.data.getValue() gives empty string?...

# stackoverflow

[user]

Why documentt.data.getValue() gives empty string?
Please help my to get a value from Firestore
I have a Firestore database where "adminData" collection but only single value is essential. I will like to retrieve it from the firebase database and store it in string. Can you please help me with the implementation in android studio using Kotlin?
val myString : StringBuffer = StringBuffer()

var db = FirebaseFirestore.getInstance()
db.collection("adminData").get()
.addOnCompleteListener { it ->
if(it.isSuccessful) {...