Skip to content

Fix Shell flyout template type cast errors on Android #3119

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
wants to merge 2 commits into
base: main
Choose a base branch
from
Draft

Fix Shell flyout template type cast errors on Android #3119

Changes from all commits
Commits
Show all changes
2 commits
Select commit Hold shift + click to select a range
40f5c00
Initial plan
Copilot Nov 28, 2025
312808b
docs: Fix Shell flyout template to prevent type cast errors on Android
Copilot Nov 28, 2025
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
19 changes: 8 additions & 11 deletions docs/fundamentals/shell/flyout.md
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
---
title: ".NET MAUI Shell flyout"
description: "Learn how to customize and control a .NET MAUI flyout, which is the optional root menu for a .NET MAUI Shell app."
ms.date: 08/30/2024
ms.date: 11/28/2025
---

# .NET MAUI Shell flyout
Expand Down Expand Up @@ -180,8 +180,9 @@ The default <xref:Microsoft.Maui.Controls.DataTemplate> used for each <xref:Micr
</VisualState>
<VisualState x:Name="Selected">
<VisualState.Setters>
<Setter Property="BackgroundColor"
Value="{AppThemeBinding Light=Black, Dark=White}" />
<Setter TargetName="FlyoutItemLayout"
Property="BackgroundColor"
Value="{AppThemeBinding Light=#1A000000, Dark=#1AFFFFFF}" />
</VisualState.Setters>
</VisualState>
</VisualStateGroup>
Expand Down Expand Up @@ -209,19 +210,12 @@ The default <xref:Microsoft.Maui.Controls.DataTemplate> used for each <xref:Micr
<Label x:Name="FlyoutItemLabel"
Grid.Column="1"
Text="{Binding Title}"
TextColor="{OnPlatform Android={AppThemeBinding Light=#DE000000, Dark=White}}"
FontSize="{OnPlatform Android=14, iOS=14}"
FontAttributes="{OnPlatform iOS=Bold}"
HorizontalOptions="{OnPlatform WinUI=Start}"
HorizontalTextAlignment="{OnPlatform WinUI=Start}"
VerticalTextAlignment="Center">
<Label.TextColor>
<OnPlatform x:TypeArguments="Color">
<OnPlatform.Platforms>
<On Platform="Android"
Value="{AppThemeBinding Light=Black, Dark=White}" />
</OnPlatform.Platforms>
</OnPlatform>
</Label.TextColor>
<Label.Margin>
<OnPlatform x:TypeArguments="Thickness">
<OnPlatform.Platforms>
Expand All @@ -243,6 +237,9 @@ The default <xref:Microsoft.Maui.Controls.DataTemplate> used for each <xref:Micr
</DataTemplate>
```

> [!IMPORTANT]
> When combining `OnPlatform` with `AppThemeBinding`, avoid nesting `AppThemeBinding` inside an `<OnPlatform>` element with `x:TypeArguments="Color"`, as this can cause type cast errors at runtime on Android. Instead, use the inline markup extension syntax as shown above, or apply colors directly using style classes.

This template can be used for as a basis for making alterations to the existing flyout layout, and also shows the visual states that are implemented for flyout items.

In addition, the <xref:Microsoft.Maui.Controls.Grid>, <xref:Microsoft.Maui.Controls.Image>, and <xref:Microsoft.Maui.Controls.Label> elements all have `x:Name` values and so can be targeted with the Visual State Manager. For more information, see [Set state on multiple elements](~/user-interface/visual-states.md#set-state-on-multiple-elements).
Expand Down