WIP: addressing the layer-3 WindowingPlatformStub.NotSupportedException
crash on PostIt.Android by downgrading to the Avalonia 11 / Avalonia.Maui
11 stack, where the Android runtime platform layer (IWindowingPlatform)
gets properly bound via the MAUI embedding extension instead of being
left as a stub.
Touched files:
- src/PostIt/Directory.Packages.props:
- Avalonia 12.1.1 -> 11.3.20 (Avalonia, Avalonia.Android,
Avalonia.AvaloniaEdit, Avalonia.Browser, Avalonia.Desktop,
Avalonia.Fonts.Inter, Avalonia.Themes.Fluent).
- New: Avalonia.Maui 11.3.0.
- Microsoft.Maui.Essentials 10.0.100 -> 8.0.100 (aligns with the
Microsoft.Maui.Controls 8.0.x family that Avalonia.Maui 11.3.0
pulls transitively).
- New: Microsoft.Maui.Controls 8.0.100.
- src/PostIt/PostIt.Android/PostIt.Android.csproj:
- TargetFramework net10.0-android -> net9.0-android36.0 (Avalonia
Android 11.3.20 targets net8.0-android34.0, but the
compat-ascending fallback lets us consume from net9.0-android36.0
against the API-36 platform that's already installed locally).
- Add Avalonia.Maui PackageReference.
- Restore Microsoft.Maui.Essentials PackageReference (left in
earlier removal during the MAUI-cause-of-crash hypothesis check).
- src/PostIt/PostIt/PostIt.csproj: TargetFramework net10.0 -> net9.0
(must match what PostIt.Android consumes transitively, otherwise
the build chain breaks).
- src/Yavsc.Abstract/Yavsc.Abstract.csproj: net10.0 -> net9.0 (same
reason; six other consumers stay on net10.0 and pick up the new
assembly via standard TFM compat).
- src/Yavsc.Api.Client/Yavsc.Api.Client.csproj: net10.0 -> net9.0
(same reason).
- src/PostIt/PostIt.Android/Application.cs: rewritten as a bare
Android.App.Application. Avalonia 11 no longer ships
AvaloniaAndroidApplication<TApp> (that was an Avalonia 12
introduction); the Avalonia init now lives in MainActivity via
AvaloniaMainActivity<TApp>. The class is kept only so the
[Application] manifest entry remains.
- src/PostIt/PostIt.Android/MainActivity.cs: now inherits
AvaloniaMainActivity<App> and overrides CustomizeAppBuilder to
chain .UseMaui<PostIt.Maui.MauiEmbeddingApp>(this) before
.WithInterFont(). AvaloniaMainActivity<TApp> handles the
AvaloniaView initialisation in OnCreate.
- src/PostIt/PostIt/Maui/MauiEmbeddingApp.cs (new): empty
Microsoft.Maui.Controls.Application used as the embedding host for
Avalonia.Maui. The MAUI window it produces is consumed by the
Avalonia.Maui embedding pipeline and never surfaces to the user;
Avalonia owns the actual visual tree.
Build status: 11 errors remaining, all CS0234 / CS0246 against
'Avalonia.Controls.ContentPage'. Avalonia 11 did not ship
ContentPage (it's an Avalonia 12 type, presumably for MAUI parity).
All seven PostIt pages inherit ContentPage today and need to be
reworked to UserControl before the build can complete. Follow-up
commit will do that.
Reference: AGENTS.md, 'PostIt.Android boot crash sur AVD x86_64 :
investigation par couches', couche 3.
Paul Schneider
a4bc7b5e6a