get data from firebase kotlin code example

Example: introduction to firebase database android kotlin example

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".UserAccount">

    <TextView
        android:id="@+id/user_name"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        android:text="@string/dummy_name"
        android:textSize="32sp"/>

    <TextView
        android:id="@+id/user_mobile"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/user_name"
        android:text="@string/dummy_mobile"
        android:textSize="32sp"/>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/textInputLayout"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:layout_marginTop="32dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/user_mobile">

        <EditText
            android:id="@+id/name_edt_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="@string/name_hint" />

    </com.google.android.material.textfield.TextInputLayout>

    <com.google.android.material.textfield.TextInputLayout
        android:id="@+id/textInputLayout2"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textInputLayout">

        <EditText
            android:id="@+id/mobile_edt_text"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="@string/mobile_hint"
            android:inputType="phone" />

    </com.google.android.material.textfield.TextInputLayout>

    <Button
        android:id="@+id/update_user_btn"
        android:layout_width="match_parent"
        android:layout_height="56dp"
        android:layout_marginTop="8dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/textInputLayout2"
        android:text="@string/update_user_info"/>

</androidx.constraintlayout.widget.ConstraintLayout>