[NET 9 regression] Changing StatusBar and NavigationBar background color doesn't work with Modal pages

[OvrBtn]

Description

.NET 8:

2025-03-21.14-48-39.mp4

.NET 9:

2025-03-21.14-43-44.mp4

Steps to Reproduce

No response

Link to public reproduction project repository

https://github.com/OvrBtn/NavigationBarColor (there are separate branches for net8 and net9)

Version with bug

9.0.50 SR5

Is this a regression from previous behavior?

Yes, this used to work in .NET MAUI

Last version that worked well

8.0.100 SR10

Affected platforms

Android, I was not able test on other platforms

Affected platform versions

Tested on API 30

Did you find any workaround?

No response

Relevant log output

[similar-issues-ai]

We've found some similar issues:

• Net 9 Android - StatusBar Color overriden on modal pages #26388 , similarity score: 86%
• [BUG] Net 9 Android - StatusBar Color overriden on modal pages #26954 , similarity score: 86%

If any of the above are duplicates, please consider closing this issue out and adding additional context in the original issue.

Note: You can give me feedback by 👍 or 👎 this comment.

[OvrBtn]

Seems like workaround from https://learn.microsoft.com/en-us/dotnet/communitytoolkit/maui/platform-specific/dialogfragment-customization works for status bar but not for navigation bar

2025-03-21.15-05-27.mp4

[OvrBtn]

Seems like also the navigation bar can be worked around by adding a couple of lines to workaround from CommunityToolkit/Maui#2370 (comment)

2025-03-21.15-29-19.mp4

Code:

In Platforms -> Android

using Android.Views;
using AndroidX.Activity;
using Microsoft.Maui.LifecycleEvents;
using Microsoft.Maui.Platform;
using FragmentManager = AndroidX.Fragment.App.FragmentManager;

namespace NavigationBarColor ///// <----------------- make sure to adjust the namespace
{
    public static class MauiProgramExtensions
    {
        public static MauiAppBuilder ConfigureStatusBarAndNavigationBarColorsForModalPages(this MauiAppBuilder builder)
        {
            builder.ConfigureLifecycleEvents(a =>
             {
                 a.AddAndroid(builder =>
                 {
                     builder.OnCreate((activity, bundle) =>
                     {
                         if (activity is not ComponentActivity componentActivity)
                         {
                             return;
                         }
                         componentActivity.GetFragmentManager()?.RegisterFragmentLifecycleCallbacks(new MyFragmentLifecycleCallbacks((fm, f) =>
                         {
                             if (f is AndroidX.Fragment.App.DialogFragment dialogFragment)
                             {
                                 var activity = Platform.CurrentActivity;

                                 if (activity is null)
                                 {
                                     return;
                                 }

                                 var statusBarColor = activity.Window!.StatusBarColor;
                                 var navigationBarColor = activity.Window!.NavigationBarColor;
                                 var platformStatusBarColor = new Android.Graphics.Color(statusBarColor);
                                 var platformNavigationBarColor = new Android.Graphics.Color(navigationBarColor);

                                 var dialog = dialogFragment.Dialog;
                                 if (dialog is null)
                                 {
                                     return;
                                 }

                                 var window = dialog.Window;
                                 if (window is null)
                                 {
                                     return;
                                 }
                                 dialog.Window.SetStatusBarColor(platformStatusBarColor);
                                 dialog.Window.SetNavigationBarColor(platformNavigationBarColor);

                                 bool isColorTransparent = platformStatusBarColor == Android.Graphics.Color.Transparent;
                                 if (isColorTransparent)
                                 {
                                     window.ClearFlags(WindowManagerFlags.DrawsSystemBarBackgrounds);
                                     window.SetFlags(WindowManagerFlags.LayoutNoLimits, WindowManagerFlags.LayoutNoLimits);
                                 }
                                 else
                                 {
                                     window.ClearFlags(WindowManagerFlags.LayoutNoLimits);
                                     window.SetFlags(WindowManagerFlags.DrawsSystemBarBackgrounds, WindowManagerFlags.DrawsSystemBarBackgrounds);
                                 }

#if ANDROID30_0_OR_GREATER
                            window.SetDecorFitsSystemWindows(!isColorTransparent);
#endif
                             }

                         }), false);
                     });
                 });
             });

            return builder;
        }

        public class MyFragmentLifecycleCallbacks(Action<AndroidX.Fragment.App.FragmentManager, AndroidX.Fragment.App.Fragment> onFragmentStarted) : FragmentManager.FragmentLifecycleCallbacks
        {
            public override void OnFragmentStarted(FragmentManager fm, AndroidX.Fragment.App.Fragment f)
            {
                onFragmentStarted?.Invoke(fm, f);
                base.OnFragmentStarted(fm, f);
            }
        }
    }
}

Register in MauiProgram.cs

        builder
            .UseMauiApp<App>()
#if ANDROID
            .ConfigureStatusBarAndNavigationBarColorsForModalPages()
#endif
            .ConfigureFonts(fonts =>
            {
                fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
                fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
            });

[devanathan-vaithiyanathan]

This issue has been verified using VS code(1.98.1) with MAUI version 9.0.50. It can be reproduced on Android platform. On 8.0.100 works fine.
Confirms that the regression started from 9.0.0 itself.