None of the previous answers worked for me, so I show the one that worked in my case.
<style name="AppThemeCustom" parent="Base.Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">@color/primary</item>
<item name="colorPrimaryDark">@android:color/black</item>
<item name="colorAccent">@color/colorAccent</item>
<item name="actionBarStyle">@style/MyActionBar</item>
<item name="android:windowBackground">@android:color/white</item>
</style>
<style name="MyActionBar" parent="@style/Widget.AppCompat.ActionBar">
<item name="android:titleTextStyle">@style/MyTitleTextStyle</item>
<item name="titleTextStyle">@style/MyTitleTextStyle</item>
</style>
<style name="MyTitleTextStyle"
parent="@style/TextAppearance.AppCompat.Widget.ActionBar.Title">
<item name="android:textColor">@android:color/black</item>
</style>
I wish that if you find yourself in my situation, this decision will save your day. lol
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