Uno Platform app react to Android theme change

Question

While for the most part Uno Platform apps are able to handle theme changes internally, I have some custom code in my app that needs to react to theme change. For example when user changes from light them to dark theme here:

Android display settings for theme

In my code I can get the theme value initially like this:

var color = (Color)App.Current.Resources["SystemBaseHighColor"]

Now when the user changes theme and returns to the app I want to detect that and programmatically update some component. Is there an event I can hook into for this?

Answer 1

You can listen for theme changes on all platforms using the ThemeListener helper class from the Windows Community Toolkit. It's supported by recent Uno Platform versions.

Just create a new instance of ThemeListener and subscribe to the ThemeListener.ThemeChanged event.