modelo_spinner_items.xml

<?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"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="horizontal"
    android:gravity="start"
    android:layout_width="match_parent"
    android:background="@color/colorCajas"
    android:layout_height="50dp">

    <TextView
        android:id="@+id/itemSpinnerTexto"
        android:fontFamily="@font/bentonbook"
        android:layout_width="0dp"
        android:layout_height="30dp"
        android:layout_marginStart="10dp"
        android:layout_marginLeft="10dp"
        android:textColor="#FFFFFF"
        android:textSize="16sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>