[Android] Fix for TabbedPage BottomNavigation BarBackgroundColor not extending to system navigation bar

src/Controls/tests/DeviceTests/Elements/TabbedPage/TabbedPageTests.Android.cs

@@ -209,6 +209,49 @@ public async Task RotationConsistent()
 			var platformRotation = await InvokeOnMainThreadAsync(() => handler.PlatformView.Rotation);
 			Assert.Equal(expected, platformRotation);
 		}
+
+		[Fact]
+		[Description("BottomNavigationView should extend to screen bottom in Edge-to-Edge mode (Issue 33344)")]
+		public async Task BottomNavigationViewExtendsToScreenBottom()
+		{
+			SetupBuilder();
+
+			var tabbedPage = new TabbedPage
+			{
+				Children =
+				{
+					new ContentPage() { Title = "Page1" },
+					new ContentPage() { Title = "Page2" }
+				},
+				BarBackgroundColor = Colors.Orange
+			};
+
+			Microsoft.Maui.Controls.PlatformConfiguration.AndroidSpecific.TabbedPage
+				.SetToolbarPlacement(tabbedPage, Microsoft.Maui.Controls.PlatformConfiguration.AndroidSpecific.ToolbarPlacement.Bottom);
+
+			await CreateHandlerAndAddToWindow<TabbedViewHandler>(tabbedPage, async handler =>
+			{
+				var bottomNavView = GetBottomNavigationView(handler);
+				Assert.NotNull(bottomNavView);
+
+				// Wait for layout to complete
+				await AssertEventually(() => bottomNavView.Height > 0);
+
+				var location = new int[2];
+				bottomNavView.GetLocationOnScreen(location);
+				var bottomNavBottom = location[1] + bottomNavView.Height;
+
+				var decorView = MauiContext.Context.GetActivity()?.Window?.DecorView;
+				Assert.NotNull(decorView);
+
+				decorView.GetLocationOnScreen(location);
+				var screenHeight = location[1] + decorView.Height;
+
+				Assert.True(Math.Abs(screenHeight - bottomNavBottom) < 2,
+					$"BottomNavigationView should extend to screen bottom. Expected bottom at {screenHeight}px, but was at {bottomNavBottom}px (gap of {screenHeight - bottomNavBottom}px)");
+			});
+		}
+
 		BottomNavigationView GetBottomNavigationView(IPlatformViewHandler tabViewHandler)
 		{
 			var layout = tabViewHandler.PlatformView.FindParent((view) => view is CoordinatorLayout)

src/Core/src/Platform/Android/MauiWindowInsetListener.cs

@@ -264,37 +264,30 @@ public MauiWindowInsetListener() : base(DispatchModeStop)
 				}
 			}
 
-			// Handle bottom navigation
-			var hasBottomNav = v.FindViewById(Resource.Id.navigationlayout_bottomtabs)?.MeasuredHeight > 0;
+			var bottomTabContainer = v.FindViewById<ViewGroup>(Resource.Id.navigationlayout_bottomtabs);
+			var hasBottomNav = bottomTabContainer?.MeasuredHeight > 0;
+			var contentView = v.FindViewById(Resource.Id.navigationlayout_content);
+
 			if (hasBottomNav)
 			{
 				var bottomInset = Math.Max(systemBars?.Bottom ?? 0, displayCutout?.Bottom ?? 0);
-				v.SetPadding(0, 0, 0, bottomInset);
+
+				// Only pad the bottom of contentView to prevent content from sliding under the
+				// BottomNavigationView + system navigation bar. Left/right are intentionally
+				// excluded: landscape cutout padding on the content area is handled by
+				// SafeAreaExtensions which applies per-view overlap logic.
+				contentView?.SetPadding(0, 0, 0, bottomInset);
 			}
 			else
 			{
-				v.SetPadding(0, 0, 0, 0);
+				// Reset contentView padding when bottom navigation is removed dynamically
+				contentView?.SetPadding(0, 0, 0, 0);
 			}
 
-			// Create new insets with consumed values
-			var newSystemBars = Insets.Of(
-				systemBars?.Left ?? 0,
-				appBarHasContent ? 0 : systemBars?.Top ?? 0,
-				systemBars?.Right ?? 0,
-				hasBottomNav ? 0 : systemBars?.Bottom ?? 0
-			) ?? Insets.None;
-
-			var newDisplayCutout = Insets.Of(
-				displayCutout?.Left ?? 0,
-				appBarHasContent ? 0 : displayCutout?.Top ?? 0,
-				displayCutout?.Right ?? 0,
-				hasBottomNav ? 0 : displayCutout?.Bottom ?? 0
-			) ?? Insets.None;
-
-			return new WindowInsetsCompat.Builder(insets)
-				?.SetInsets(WindowInsetsCompat.Type.SystemBars(), newSystemBars)
-				?.SetInsets(WindowInsetsCompat.Type.DisplayCutout(), newDisplayCutout)
-				?.Build() ?? insets;
+			// Pass insets through unconsumed so child views receive them intact.
+			// Bottom: BottomNavigationView needs the nav bar inset to extend its background in Edge-to-Edge mode (Issue #33344).
+			// Top: SafeAreaExtensions handles per-view overlap, avoiding double-padding.
+			return insets;
 		}
 
 		public void TrackView(AView view)