This sample shows how to enable Material 3 for a .NET MAUI Android app and customize colors at both layers:

• Android's native Material 3 theme through Platforms/Android/Resources/values/colors.xml.
• MAUI/XAML styling through Resources/Styles/Colors.xaml.

• MauiMaterial3CustomizationSample.csproj enables Material 3 with <UseMaterial3>true</UseMaterial3> and pins the MAUI package to 10.0.60.
• Platforms/Android/Resources/values/colors.xml overrides both the legacy Android aliases and the Material 3 m3_sys_color_* roles used by the native Android Material 3 theme.
• Resources/Styles/Colors.xaml defines the same teal Material 3-inspired palette for cross-platform MAUI resources.
• MainPage.xaml includes a Colors.xaml card with explicit XAML bindings, followed by native MAUI controls that get their Android styling from colors.xml.
• App.xaml intentionally only merges Resources/Styles/Colors.xaml so global implicit XAML styles do not hide the native Material 3 colors.

Install the .NET 10 SDK with the MAUI workload, then run:

dotnet restore
dotnet build -t:Run -f net10.0-android

For real Android Material 3 theme changes, update the m3_sys_color_light_* and m3_sys_color_dark_* values in colors.xml, not only colorPrimary.

For app-level MAUI styling, update Resources/Styles/Colors.xaml and bind those resources from XAML with StaticResource or AppThemeBinding.

Only if you are styling your own MAUI/XAML UI. Colors.xaml defines resources, but it does not automatically change Android's native Material 3 theme.

This repo includes two experiment screenshots:

• screenshots/before-default-material3.png: Material 3 is enabled with the default purple Android theme and default purple Colors.xaml resources.
• screenshots/experiment-colors-xaml-only.png: Android colors.xml was reset to the default purple values while Colors.xaml was changed to an intentionally orange palette. The explicitly bound XAML card is orange, but the native Material 3 controls still use the Android theme colors.
• screenshots/experiment-colors-xaml-with-styles.png: Styles.xaml was also merged, so some MAUI control properties picked up teal XAML resources. Native theme-owned pieces still come from Android resources.

Recommended rule: put the same palette in both places. Use colors.xml for Android's native Material 3 theme and Colors.xaml for MAUI/XAML UI that you style yourself.