Android Question Activity color at start up

[giggetto71]

Hi,
I am trying to control the android initial activity color.
in the attached project the initial screen gets white if I set the LightTheme in the manifest and it gets black when I set DarkTheme in the manifest.
What I would like is the app to follow the phone mode as many other apps do. basically I would like the initial screen white if the phone is NOT in night mode and I would like it black if the phone is in night mode.
I have tried to customize the manifest like:

SetActivityAttribute(Main, android:theme, @style/CustomActTheme)
CreateResource(values, theme.xml,
<resources>
  <style name="CustomActTheme">
  <item name="android:windowBackground">@android:color/transparent</item>
  <item name="android:windowNoTitle">true</item>
  <item name="android:windowFullscreen">false</item>
</style>
</resources>
)

but still I can't get the desired behavior.
thanks for any help.

 

[peacemaker]

Just for ref:

Implement dark theme | Views | Android Developers

This document describes how to implement a dark theme in an Android app, including benefits, setting up themes, handling in-app theme changes, and best practices for notifications and launch screens.

developer.android.com

change according to dark mode

How can I make it so that drawables and objects in MainActivity.xml change colour depending on if dark mode is on or not? I have this in colors.xml: <resources> <color name="colorPrimary"...

stackoverflow.com