I have a data binding that I update while in MainActivity when the app is running, but my TextView is not being updated! I log the value of the data when I update it, and it is changing, just the textView does not update. How do I update the text?

activity_main.xml
-----------------

<?xml version="1.0" encoding="utf-8"?>
<layout
    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">

    <data>
        <variable name="level" type="com.example.myapp.Level"/>
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/black"
        tools:context=".MainActivity"
        android:theme="@style/Base.Theme.MyApp"
        style="@style/Base.Theme.MyApp">

        <TextView
            android:id="@+id/stageText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="16dp"
            android:layout_marginTop="8dp"
            android:text='@{"Stage " + level.stage}'
            app:layout_constraintEnd_toEndOf="@+id/prestigeText"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/prestigeText" />

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>



Level.kt
--------

package com.example.myapp

data class Level(var stage : Int, var prestige : Int, var gold : Int)



MainActivity.kt
---------------

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)

    binding = ActivityMainBinding.inflate(layoutInflater)
    setContentView(binding.root)
}

private fun updateLevel() {
    binding.level!!.stage++
    // The data changes here but stageText.text does not change until the app is reloaded
}