retrieving data from Firebase database in android studios with the kotlin language

Question

I am new to the firebase database and is still learning a few things about it. I am trying to pull out data from the real-time database and I am having a hard time doing it.

my database layout is like this.

users 
      --UId
           --firstname
           --lastname
           --dateofbirth
           --mobile
           --email
           --type

my user model

data class User(val uid: String? = "",
                val Firstname:String = "",
                val Lastname:String = "",
                val Mobile:String ="",
                val Dateofbirth:String ="",
                val email:String = "",
                val type: String = ""
){
    constructor(): this ("","","","","","","")
}

I am trying to pull out firstname, lastname, mobile, dateofbirth and email and attach it to my profile textfields for them fname,lname,dob,email

This is the code I am working with

 private fun getUserInfo() {
        val uid = FirebaseAuth.getInstance().currentUser!!.uid
        val ref = FirebaseDatabase.getInstance().reference
        val uidRef = ref.child("users").child(uid)
        val valueEventListener: ValueEventListener = object : ValueEventListener {
            override fun onDataChange(dataSnapshot: DataSnapshot) {
            for (I in dataSnapshot.children){



            }

            }

            override fun onCancelled(databaseError: DatabaseError) {
                Log.d("error", databaseError.message)

            }

        }
        uidRef.addListenerForSingleValueEvent(valueEventListener)
    }

How do I pull out that information?

Thanks for the help!

Answer 1

It is recommended to use camel case naming scheme for property names like this:

val firstName: String = " "
val secondName: String = " "

You can pull user info like this:

 private fun getUserInfo() {
        val uid = FirebaseAuth.getInstance().currentUser!!.uid
        val ref = FirebaseDatabase.getInstance().reference
        val uidRef = ref.child("users").child(uid)
        val valueEventListener: ValueEventListener = object : ValueEventListener {
            override fun onDataChange(dataSnapshot: DataSnapshot) {
                val user = dataSnapshot.getValue(User::class.java)
                //user.firstName
                //user.lastName
                //...
               
            }

            override fun onCancelled(databaseError: DatabaseError) {
                Log.d("error", databaseError.message)

            }

        }
        uidRef.addListenerForSingleValueEvent(valueEventListener)
    }