RelativeLayout crashes android app.

[comarkiewicz]

Description

Using a RelativeLayout will result in a .NET MAUI app to crash while on Android. Other platforms haven't been tested. No errors or exceptions are produced in the debugger or the device log.

Steps to Reproduce

1. Create a new .NET MAUI app.
2. Replace the contents of the MainPage.xaml with the following:

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:cmp="clr-namespace:Microsoft.Maui.Controls.Compatibility;assembly=Microsoft.Maui.Controls"
             x:Class="Test_Maui_App.MainPage">

    <ScrollView>
        <cmp:RelativeLayout>

        </cmp:RelativeLayout>
    </ScrollView>

</ContentPage>

3. Replace the contents of the MainPage.xaml.cs with the following:

namespace Test_Maui_App;

public partial class MainPage : ContentPage
{
	public MainPage()
	{
		InitializeComponent();
	}
}

4. Attempt to run the app on an android device and observe the crash that occurs.

Link to public reproduction project repository

https://github.com/comarkiewicz/RelativeLayout-Crash

Version with bug

6.0.312

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

Android 12 and up

Did you find any workaround?

No response

Relevant log output

No response

[ghost]

We've moved this issue to the Backlog milestone. This means that it is not going to be worked on for the coming release. We will reassess the backlog following the current release and consider this item at that time. To learn more about our issue management process and to have better expectation regarding different types of issues you can read our Triage Process.

[jfversluis]

Also seems to (still) happen on Windows: #6063 (comment)

[XamlTest]

Verified this on Visual Studio Enterprise 17.7.0 Preview 2.0. Repro on Windows 11, Android 13.0-API33 and iOS 16.4 with below Project:
12748.zip

[samhouts]

This is not a bug. The RelativeLayout is a compatibility feature. You must opt into these features by configuring your MauiProgram to Use Compatibility. You do this by editing your MauiProgram.cs to the following:

	public static MauiApp CreateMauiApp()
	{
		var builder = MauiApp.CreateBuilder();
		builder
			.UseMauiApp<App>()
			.ConfigureFonts(fonts =>
			{
				fonts.AddFont("OpenSans-Regular.ttf", "OpenSansRegular");
				fonts.AddFont("OpenSans-Semibold.ttf", "OpenSansSemibold");
			})
            .UseMauiCompatibility(); // <---- add this line!!

#if DEBUG
		builder.Logging.AddDebug();
#endif

		return builder.Build();
	}

The error message tells you to do this.

I verified that this works with the repro project.

Thanks!

[jaysidri]

The MauiApp builder does not have a method named UseMauiCompatibility() -- do I need to install a nuget to enable this?

EDIT: never mind -- this extension method requires a using Microsoft.Maui.Controls.Compatibility.Hosting;

[ghost]

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