res/color/text_color_primary_invertible.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2011 Google Inc. All Rights Reserved. -->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_enabled="false"
        android:color="#ff999999"/>
    <item android:state_activated="true"
        android:color="@android:color/white" />
    <item
        android:color="@android:color/black" />
</selector>