topic Re: MapView stays empty on latest .NET MAUI on Android in .NET Maps SDK Questions

MapView stays empty on latest .NET MAUI on Android

SokoFromNZ — Tue, 02 May 2023 16:37:45 GMT

Hi,

This took me a day to figure out 😞

It seems with the latest version of your Runtime (<PackageReference Include="Esri.ArcGISRuntime.Maui" Version="200.1.0" />) and the latest Visual Studio 2022 Version (Enterprise v17.5.5, .NET MAUI to 7.0.81 (SR4)) maps are not shown anymore.

I've reproduced this on an emulator an two real world devices.

I've created a simple/default .NET MAUI app for your convenience (see zip attached).

The core issue is in the xaml:

<?xml version="1.0" encoding="utf-8" ?> <ContentPage x:Class="ArcGISTry1.MainPage" xmlns="http://schemas.microsoft.com/dotnet/2021/maui" xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Maui;assembly=Esri.ArcGISRuntime.Maui">  <Grid ColumnDefinitions="*, Auto" RowDefinitions="*, Auto"> <esriUI:MapView x:Name="MyMapView" Grid.Row="0" Grid.RowSpan="2" Grid.Column="0" Grid.ColumnSpan="2" /> <Button Grid.Row="1" Grid.Column="1" Text="..." /> </Grid> </ContentPage>

If I put the MapView into a Grid with Auto-Columns/Rows the page stays empty:

If I use just Star-Columns/Rows everything works fine:

Please investigate as I need this to work asap for a upcoming release

Re: MapView stays empty on latest .NET MAUI on Android

dotMorten_esri — Tue, 02 May 2023 22:05:56 GMT

I've been able to reproduce this, and while I don't have a fix/explanation right at this moment, I was able to get the behavior you're looking for with a slightly different layout:

Re: MapView stays empty on latest .NET MAUI on Android

SokoFromNZ — Wed, 03 May 2023 06:32:11 GMT

Hi,

Good to hear you can reproduce it. Is there an official way for me to report real bugs in the runtime? Or do you create a bug report to your developers about this issue now?

After creating this ticket I came up with the exact same workaround as you did 🙂

Anyhow...I'm looking forward to an explanation for this. Please keep me up to date

Soko

Re: MapView stays empty on latest .NET MAUI on Android

dotMorten_esri — Tue, 30 May 2023 23:50:08 GMT

Sorry for the slow follow-up. I've been spending some time debugging this, and I'm 99.9% sure this is a layout bug in .NET MAUI, and not in the ArcGIS Maps SDK. It's sending some weird layout parameters when you use the specific configuration you have above, causing the map to size itself to 0.
However I did find numerous other ways to get the layout you want without triggering this bug, so you should be able to move forward.

Re: MapView stays empty on latest .NET MAUI on Android

MatveiStefarov — Thu, 01 Jun 2023 16:00:10 GMT

I think you're right, Morten. The bug disappears when building the reproducer with latest Visual Studio Preview. There have been many layout bugs fixed in MAUI recently, perhaps this has already been taken care of by Microsoft.

Re: MapView stays empty on latest .NET MAUI on Android

SokoFromNZ — Fri, 02 Jun 2023 06:38:53 GMT

Hi guys...and thanks for the effort.

So whats the plan here? I reckon to wait for the next VS version?

@MatveiStefarov: which version exactly did you test? Was it a v17.6.3 or a 17.7.0?

Thanks

Soko

Re: MapView stays empty on latest .NET MAUI on Android

dotMorten_esri — Fri, 02 Jun 2023 22:27:16 GMT

> So whats the plan here?

Since this is a layout bug outside the Maps SDK, you have a few choices:

Work around it (as mentioned above it fixes itself quite easily by not relying on auto-sizing or rearranging layout layered instead of gridded.
Wait for .NET 8 to ship with the fix (and/or use the preview for now).
Push Microsoft to backport the fix to .NET 7.

Re: MapView stays empty on latest .NET MAUI on Android

SokoFromNZ — Mon, 05 Jun 2023 03:04:29 GMT

Heya,

I've ment actually _your_ plan 😉

I've implemented the work around already so I have no urgend need for a fix here.

But you are certian MatveiStefavor tested with a .NET8 preview here?

Re: MapView stays empty on latest .NET MAUI on Android

dotMorten_esri — Mon, 05 Jun 2023 22:44:59 GMT

I trust the testing the team-members do. In addition it is backed up by numerous layout fixes in the .NET MAUI previews.

Re: MapView stays empty on latest .NET MAUI on Android

SokoFromNZ — Wed, 27 Dec 2023 15:06:48 GMT

With the newest ArcGIS Runtime 200.3 and .NET8/MAUI8 this issue is solved