[Android] How to paint the system top status bar the same background as the default content background

[paulober]

I want the modern android app look where the content background ist the same as the status bar background and it adapts depending on dark and light mode. To achieve this I tried using the CommunityToolkit StatusbarBehaviour from C# code to dynamically adjust but at the moment it works for a brief moment at the start of the app and then it switches to the primary color of the colors.xaml.
Does anyone know a reliable solution to implement this basic feature in a .NET MAUI app?

Here is my workaround I tried to use in AppShell.xaml.cs:

#if ANDROID
    private StatusBarBehavior _androidStatusBarBehavior = null!;
#endif

    public AppShell()
    {
        InitializeComponent();

#if ANDROID
        SetupAndroidStatusBar();
#endif
    }

#if ANDROID
private void SetupAndroidStatusBar()
    {
        _androidStatusBarBehavior = new StatusBarBehavior
        {
            ApplyOn = StatusBarApplyOn.OnBehaviorAttachedTo
        };

        Behaviors.Add(_androidStatusBarBehavior);

        // initial config
        ApplyThemeToSystemBars();

        if (Application.Current != null)
        {
            // subscribe to event for theme changes to update the behavior
            Application.Current.RequestedThemeChanged += (s, e) => ApplyThemeToSystemBars();
        }
    }

    private void ApplyThemeToSystemBars()
    {
        var isDark = Application.Current?.RequestedTheme == AppTheme.Dark;

        var window = Platform.CurrentActivity?.Window;
        if (window == null) return;
        var controller = new WindowInsetsControllerCompat(window, window.DecorView);

        if (isDark)
        {
            _androidStatusBarBehavior.StatusBarStyle = StatusBarStyle.LightContent;
            controller.AppearanceLightNavigationBars = false;

            if (Application.Current?.Resources.TryGetValue("DarkBackground", out var value) ?? false)
            {
                var darkColor = (Color)value;
                _androidStatusBarBehavior.StatusBarColor = darkColor;
#pragma warning disable CA1422
                window.SetNavigationBarColor(darkColor.ToPlatform());
#pragma warning restore CA1422
            }
        }
        else
        {
            _androidStatusBarBehavior.StatusBarStyle = StatusBarStyle.DarkContent;
            controller.AppearanceLightNavigationBars = true;

            if (Application.Current?.Resources.TryGetValue("LightBackground", out var value) ?? false)
            {
                var lightColor = (Color)value;
                _androidStatusBarBehavior.StatusBarColor = lightColor;
#pragma warning disable CA1422
                window.SetNavigationBarColor(lightColor.ToPlatform());
#pragma warning restore CA1422
            }
        }
    }
#endif