[Bug] BoxView Color in CollectionView DataTemplate ignored if Corner Radius is set (Android only)

[BenBtg]

Description

This is a repro for a customer raised issue. Repro using the CollectionView Sample app.

Steps to Reproduce

1. Open collection view Sample app.
2. Add a BoxView to the Horizontal list sample so it overlays each item.
3. Set background to transparent
4. Run app an notice BoxView is invisible.
5. Set corner radius to 10
6. Run app and notice BoxView is now white.
7. Change Corner Radius value and HotReload
8. BoxView now changes to Black.

Example DataTemplate

                <DataTemplate>
                    <Grid Padding="10" ColumnDefinitions="70, 140" RowDefinitions="35, 35" BackgroundColor="Black">
                        <Image Grid.RowSpan="2" 
                               Source="{Binding ImageUrl}" 
                               Aspect="AspectFill"
                               HeightRequest="60" 
                               WidthRequest="60" />
                        <Label Grid.Column="1" 
                               Text="{Binding Name}" 
                               FontAttributes="Bold"
                               LineBreakMode="TailTruncation" />
                        <Label Grid.Row="1"
                               TextColor="White"
                               Grid.Column="1" 
                               Text="{Binding Location}"
                               LineBreakMode="TailTruncation"
                               FontAttributes="Italic" 
                               VerticalOptions="End" />
                        <BoxView BackgroundColor="Transparent" HeightRequest="50" WidthRequest="50" CornerRadius="10" />

Expected Behavior

BoxView color does not change when setting or changing CornerRadius

Actual Behavior

BoxView Color is White or Black depending on if it is changed during HotReload

Basic Information

• Version with issue:
• Last known good version:
• Platform Target Frameworks:
• Android Support Library / AndroidX Version:
• NuGet Packages:Xamarin.Forms 5.0.0.2244
• Affected Devices: Android OnePlus 3T API 28

Environment

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Screenshots

Reproduction Link

ReproLink

Workaround

Customer is currently setting Transparency to 0.1 as a workaround. Looking into using Shapes as preferable alternative.

[irongut]

I've had the same problem for some time. I use a semi-transparent BoxView over an image to darken the image. I thought the problem was with BoxView transparency but after finding this issue and removing the CornerRadius from my BoxView it works again.

This problem first occurred when I upgraded from Xamarin.Forms 5.0.0.2012 to Xamarin.Forms 5.0.0.2083 and is still present in the latest release (5.0.0.2337).

Last known good version: Xamarin.Forms 5.0.0.2012

[jcmanke]

Still present in 5.0.0.2478. Worked around by changing to Ellipse.