How to change style.xml file delphi firemonkey

I'd like to know how to change this file style.xml to change the notification bar of android in the default material design ( link ).

I want to change the theme, but every time I change this file it goes back to what it was before I want my application to receive this theme :

<style name="Theme.MyTheme" parent="Theme.AppCompat.Light">
<!-- Here we setting appcompat’s actionBarStyle -->
<item name="actionBarStyle">@style/MyActionBarStyle</item>

<!-- ...and here we setting appcompat’s color theming attrs -->
<item name="colorPrimary">@color/my_awesome_red</item>
<item name="colorPrimaryDark">@color/my_awesome_darker_red</item>

<!-- The rest of your attributes -->