RidgeScout/app/src/main/res/layout/fragment_transfer_selector.xml

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

    <Button
        android:id="@+id/codes_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Codes"
        android:textSize="34sp"
        app:layout_constraintBottom_toTopOf="@+id/bluetoothButton"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/bluetoothButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Bluetooth"
        android:textSize="34sp"
        app:layout_constraintBottom_toTopOf="@+id/wifiButton"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/codes_button" />

    <Button
        android:id="@+id/wifiButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TODO"
        android:textSize="34sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/bluetoothButton" />

</androidx.constraintlayout.widget.ConstraintLayout>