Notice (2018-05-24): bugzilla.xamarin.com is now in
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android:alpha="0.3" is a valid value as per official android documentation.
Using the Android designer on Visual Studio, if you try to set the alpha property of a selected item, it displays an error.
We have checked and setting android:alpha="0.3" for app, it builds successfully.
Could you please provide us the test steps you followed. If possible please
attach a small complete project that demonstrates this behavior.
Also can you please add the logs from the following places?:
IDE log: Location: C:\User\AppData\Local\Xamarin\Log\
(Devenev file with latest timestamp)
Environment Info: Help> About Microsoft Visual Studio
Xamarin 3.11.646.0 (1c6da0f)
Android SDK tools 24.3
Android SDK Build-tools 22.0.1
Closing for now. Feel free to reopen if problem still happens.