My spinner dislpays no text. It has background like this:
<?xml version="1.0" encoding="utf-8"?>
<item android:state_pressed="true"
android:drawable="@drawable/spin_bg" />
<item android:drawable="@drawable/spin_bg" />
And my spin_bg.9.png looks like this:

What i get is this (no text):

Really glad i could help you
Answer as per OP’s request:
Your font color is black.