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Using Xamarin.Forms 18.104.22.168...
Wanted a circular button, with a solid color but no text or image.
The logical thing to do, if button is 40x40, is to set BorderRadius=20, BorderWidth=20, and set colors as appropriate.
Button btnOutputPageDividerButton = new Button
HeightRequest = 40,
BorderRadius = 20,
BorderWidth = 20,
BorderColor = Color.Lime,
WidthRequest = 40,
FontSize = 0,
Text = string.Empty,
HorizontalOptions = LayoutOptions.Start,
Margin = 0,
BackgroundColor = Color.White,
TextColor = Color.Black,
VerticalOptions = LayoutOptions.Start
On iOS, this does what you would expect - a solid lime circular button.
On Android, the result is a solid white square.
On UWP, the result is a clipped, lime oval, with white in the middle.
Which version of Android are you using if you don't mind my asking? I do see a solid lime circle on my Android 6.0 emulator with that code (running against the 2.3.5-pre6 build), but the UWP circle is as you describe. I'll set to confirmed for now just based on the differences until we can look into it further, but any more info from you is appreciated.
For Android, I am testing on a physical device - a Samsung Galaxy J5 running Android 6.0.1
One thought - I am assuming that the border width is inside the border radius (so, if the border radius is 20, and the border width were 5, the border would appear from 0->4 and 35->39 (as happens on iOS), rather than the border width being outside the radius or centered on the radius. I've never seen that documented. It would be good if that could be documented at https://developer.xamarin.com/api/property/Xamarin.Forms.Button.BorderRadius/ and https://developer.xamarin.com/api/property/Xamarin.Forms.Button.BorderWidth/