sample/src/main/res/values-v27/styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <style name="AppTheme" parent="@style/AppThemeBase">
        <item name="android:statusBarColor">@color/colorPrimaryDark</item>
        <item name="android:navigationBarColor">@color/colorPrimaryDark</item>
        <item name="android:windowLightNavigationBar">true</item>
        <item name="android:windowLightStatusBar">true</item>
    </style>
</resources>