<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="@style/Theme.AppCompat.Light">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
    </style>

</resources>

<resources>

    <!-- Base application theme. -->
    <style name="AppTheme" parent="@style/Theme.AppCompat.Light">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="actionBarStyle">@style/AppTheme.ActionBar</item>
    </style>

    <style name="AppTheme.ActionBar" parent="@style/Widget.AppCompat.Light.ActionBar.Solid">
        <item name="titleTextStyle">@style/AppTheme.ActionBar.TitleTextStyle</item>
    </style>

    <style name="AppTheme.ActionBar.TitleTextStyle" parent="@style/TextAppearance.AppCompat.Widget.ActionBar.Title">
        <item name="android:textColor">#FFFFFF</item>
    </style>

</resources>

Change actionbar foreground colour to white
Change actionbar foreground colour to white
