<?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"
    android:layout_width="match_parent"
    android:background="#424242"
    android:layout_height="match_parent">

    <FrameLayout
        android:id="@+id/surface_container"
        android:layout_width="match_parent"
        android:foregroundGravity="center"
        android:layout_height="match_parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"></FrameLayout>

</androidx.constraintlayout.widget.ConstraintLayout>