实时数据库防火墙

Question

 private lateinit var dbReference: DatabaseReference
    private lateinit var firebaseDatabase: FirebaseDatabase

   rebaseDatabase = FirebaseDatabase.getInstance()
            dbReference = firebaseDatabase.getReference("users")
            dbReference.setValue("First users")
    
     val currentDb = dbReference.child((currentUser?.uid!!))
                            currentDb.child("name").setValue(name)
                            currentDb.child("lastname").setValue(lastName)
                            currentDb.child("user").setValue(user)
                            currentDb.child("email").setValue(email)
                            currentDb.child("pass").setValue(pass)

   override fun onDataChange(snapshot: DataSnapshot) {
       val usernameText = findViewById<TextView>(R.id.usernameText)
                        val nameText = findViewById<TextView>(R.id.nameText)
                        val lastnameText = findViewById<TextView>(R.id.lastnameText)
                        usernameText.text =  snapshot.child("user").value?.toString()
                        nameText.text=  snapshot.child("name").value?.toString()
                        lastnameText.text=  snapshot.child("lastname").value?.toString()
            }

Answer 1

private lateinit var dbReference: DatabaseReference
dbReference = Firebase.database.reference;
dbReference.child("users").setValue("First users")

private lateinit var dbReference: DatabaseReference
private lateinit var firebaseDatabase: FirebaseDatabase.getInstance()
dbReference = firebaseDatabase.getReference("users")
dbReference.setValue("First users")

dbReference = Firebase.database("https://soundbliss-8ba73-default-rtdb.europe-west1.firebasedatabase.app").reference;

dbReference = Firebase.database.reference;

dbReference = Firebase.database("database url of ur app").reference;