circle button android
XAML Code
<ImageButton Source="images/button1.png" //This button is through an image
Padding="10,10,10,10"
WidthRequest="45"
HeightRequest="45"
BackgroundColor="#FFFFFF" //You can use opacity too for example: #FDFFFFFF
CornerRadius="108" //To curve the button
x:Name="button1"
Clicked="button1_Clicked">
</ImageButton>