[Android] Fixed box view properties

src/Controls/samples/Controls.Sample.UITests/Issues/Issue19926.xaml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
+             x:Class="Maui.Controls.Sample.Issues.Issue19926"
+             Title="Issue19926">
+
+    <ContentPage.Resources>
+        <Style TargetType="BoxView">
+            <Setter Property="WidthRequest" Value="100"/>
+            <Setter Property="HeightRequest" Value="100"/>
+            <Setter Property="Background">
+                <LinearGradientBrush StartPoint="0,0" EndPoint="0,1">
+                    <GradientStop Offset="0.4" Color="Red" />
+                    <GradientStop Offset="1" Color="Blue" />
+                </LinearGradientBrush>
+            </Setter>
+        </Style>
+    </ContentPage.Resources>
+
+    <StackLayout Spacing="20">
+        <StackLayout>
+            <Label HorizontalTextAlignment="Center" Text="Translation X"/>
+            <BoxView TranslationX="30" AutomationId="boxView"/>
+        </StackLayout>
+
+        <StackLayout>
+            <Label HorizontalTextAlignment="Center" Text="Opacity"/>
+            <BoxView Opacity="0.2"/>
+        </StackLayout>
+
+        <StackLayout>
+            <Label HorizontalTextAlignment="Center" Text="Scale X"/>
+            <BoxView ScaleX="1.5"/>
+        </StackLayout>
+    </StackLayout>
+</ContentPage>

src/Controls/samples/Controls.Sample.UITests/Issues/Issue19926.xaml.cs

@@ -0,0 +1,15 @@
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Controls.Xaml;
+
+namespace Maui.Controls.Sample.Issues;
+
+[XamlCompilation(XamlCompilationOptions.Compile)]
+[Issue(IssueTracker.Github, 19926, "[Android] Opacity bug on BoxView.Background", PlatformAffected.Android)]
+
+public partial class Issue19926 : ContentPage
+{
+	public Issue19926()
+	{
+		InitializeComponent();
+	}
+}

src/Controls/src/Core/BoxView/BoxView.cs

@@ -56,6 +56,7 @@ protected override void OnPropertyChanged([CallerMemberName] string? propertyNam
 
 			if (propertyName == BackgroundColorProperty.PropertyName ||
 				propertyName == ColorProperty.PropertyName ||
+				propertyName == BackgroundProperty.PropertyName ||
 				propertyName == CornerRadiusProperty.PropertyName)
 				Handler?.UpdateValue(nameof(IShapeView.Shape));
 		}
@@ -64,7 +65,7 @@ protected override void OnPropertyChanged([CallerMemberName] string? propertyNam
 
 		PathAspect IShapeView.Aspect => PathAspect.None;
 
-		Paint? IShapeView.Fill => Color?.AsPaint() ?? ((IView)this).Background;
+		Paint? IShapeView.Fill => Color?.AsPaint();
 
 		Paint? IStroke.Stroke => null;
 

src/Controls/tests/UITests/Tests/Issues/Issue19926.cs

@@ -0,0 +1,23 @@
+using NUnit.Framework;
+using UITest.Appium;
+using UITest.Core;
+
+namespace Microsoft.Maui.AppiumTests.Issues;
+
+public class Issue19926 : _IssuesUITest
+{
+	public override string Issue => "[Android] Opacity bug on BoxView.Background";
+
+	public Issue19926(TestDevice device)
+		: base(device)
+	{ }
+
+    [Test]
+	public void PropertiesShouldBeCorrectlyApplied()
+	{
+		this.IgnoreIfPlatforms(new TestDevice[] { TestDevice.iOS, TestDevice.Mac, TestDevice.Windows });
+		_ = App.WaitForElement("boxView");
+
+		VerifyScreenshot();
+	}
+}