activity_board.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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=".BoardActivity">

    <com.skelterjohn.tronimoes.BoardView
        android:id="@+id/board_view"
        android:layout_width="match_parent"
        android:layout_height="500dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

    <com.skelterjohn.tronimoes.HandView
        android:id="@+id/hand_view"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        android:layout_gravity="bottom"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/board_view" />

    <include layout="@layout/content_board" />

</androidx.coordinatorlayout.widget.CoordinatorLayout>