[.NET 11] Fix Material3 failures in net 11 branch

[Dhivya-SF4094]

Root Cause

Cause PR #35463

• On Android with Material 3 enabled, the toolbar’s default title and navigation icon colors were being resolved from legacy AppCompat sources instead of the Material 3 theme.
• GetDefaultTitleTextColor retrieved the color from the AppCompat Toolbar_titleTextColor styleable attribute.
• GetDefaultNavigationIconColor derived the color from the legacy DrawerArrowDrawable.Color default.
• The additional GetDefaultForegroundColor() fallback used a hard-coded black/white value based on RequestedTheme, which could override or mask the actual theme-provided color.
• As a result, the toolbar title and navigation icons could render with an incorrect or low-contrast color that did not match the Material 3 toolbar, contributing to the screenshot test failure.

Description of Change

• Updated the default toolbar color resolution to use the Material 3 theme’s colorOnSurface attribute while preserving the existing behavior for non-Material 3 themes.
• GetDefaultTitleTextColor: When RuntimeFeature.IsMaterial3Enabled is enabled, returns a ColorStateList based on colorOnSurface. Otherwise, it continues to use the existing AppCompat Toolbar_titleTextColor lookup.
• GetDefaultNavigationIconColor: When Material 3 is enabled, returns the theme’s colorOnSurface. Otherwise, it continues to use the existing DrawerArrowDrawable default.
• Removed the intermediate hard-coded GetDefaultForegroundColor() fallback from the title and navigation icon color paths, allowing the theme-provided color to remain authoritative.
• Explicitly configured IconColor and BarTextColor values continue to take precedence over these defaults.

GetDefaultForegroundColor() Was Removed

• The foreground color was not originally part of the toolbar fallback chain. The title text and navigation icon defaults previously relied directly on the theme-provided values (Toolbar_titleTextColor and DrawerArrowDrawable). GetDefaultForegroundColor() was introduced later as an additional fallback in PR [Android] Make system chrome follow MAUI bar colors (opt-in) #35463, so removing it restores the original toolbar behavior.

• It returned hard-coded Black/White values that do not represent the Material 3 colorOnSurface tonal color. This resulted in foreground colors that were inconsistent with the rest of the Material 3 toolbar.

• It took precedence over the theme-aware default in the fallback chain. Because it was evaluated earlier, it could short-circuit the resolution process and prevent the correct theme color from being applied.

• Removing it allows the theme-provided value to remain authoritative — colorOnSurface for Material 3 and the existing legacy theme default otherwise. This ensures the toolbar uses the correct platform/theme color and resolves the failing test.

[github-actions]

🚀 Dogfood this PR with:

⚠️ WARNING: Do not do this without first carefully reviewing the code of this PR to satisfy yourself it is safe.

curl -fsSL https://raw.githubusercontent.com/dotnet/maui/main/eng/scripts/get-maui-pr.sh | bash -s -- 37342

Or

• Run remotely in PowerShell:

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Pull request overview

This PR adjusts Android toolbar default foreground color resolution when Material 3 is enabled, aiming to fix screenshot test failures caused by pulling title/navigation icon colors from legacy AppCompat sources and by a hard-coded black/white fallback introduced in PR #35463.

Changes:

• For Material 3, resolves default toolbar title text and navigation icon colors from the theme’s colorOnSurface.
• Removes the intermediate hard-coded GetDefaultForegroundColor() fallback from title/navigation color resolution.
• Stops using the removed fallback for overflow icon color (now only IconColor/BarTextColor influence it).

Suppressed comments (1)

src/Controls/src/Core/Platform/Android/Extensions/ToolbarExtensions.cs:279

• context.GetThemeAttrColor(Resource.Attribute.colorOnSurface) returns 0 when the attribute isn’t found (src/Core/src/Platform/Android/ContextExtensions.cs:221-247). If Material3 is enabled via feature switch but the theme doesn’t define colorOnSurface, this will set the navigation icon color to fully transparent. Recommend treating 0 as “not resolved” and falling back to the existing DrawerArrowDrawable default.

			if (RuntimeFeature.IsMaterial3Enabled)
			{
				return context.GetThemeAttrColor(Resource.Attribute.colorOnSurface);
			}