button.xml

 <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@{itemId}"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />