app/src/main/res/layout/spinner_dropdown_item.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="28sp"
android:textAlignment="center"
android:layout_gravity="center"
android:gravity="center"
android:textColor="#000000"
/>