Try a lot of methods, in the low version of the API,a feasible method is <item name="actionMenuTextColor">@color/your_color</item>
and don't use the Android namespace
ps:
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
<!-- change the textColor -->
<item name="actionMenuTextColor">@color/actionMenuTextColor</item>
</style>