Xamarin.forms: Attribute "closeIcon" has already been defined

[daveclarke]

Description

When upgrading to Xamarin.Forms 3.5 (which installs dependency Xamarin.Android.Support.* 28.0.0.1) can no longer build Droid project

Steps to Reproduce

1. Upgrade Droid project to Xamarin.Forms 3.5
2. Rebuild project
3. Build fails with 3 errors in values.xml: Attribute "closeIcon" ("icon", "iconTint") has already been defined

Expected Behavior

Project successfully builds following upgrade

Actual Behavior

Project fails to build with errors

Basic Information

• Version with issue: 3.5.0.129452
• Last known good version: 3.4.0.1008975
• IDE: Visual Studio for Mac 7.7.4
• Platform Target Frameworks:
  
  
  
  • iOS:
  
  
  • Android: SDK Platform 28
  
  
  • UWP:
  
  
• Android Support Library Version:
• Nuget Packages:
• Affected Devices:

Screenshots

Reproduction Link

[samhouts]

@daveclarke Can you make sure that you've cleaned your project (maybe delete the bin/obj folders) and try again? If that fails, could you send us a reproduction? Thanks!

[daveclarke]

@samhouts (& @pauldipietro) thanks for following up so promptly. Yes I had deleted all the bin/obj folders. After looking at the build output in more detail I found that I was using an old version of the Android SDK Build Tools. Installing the latest version of the build tools resolved the issue for me.

[samhouts]

Hooray! Thank you for letting us know. If you have any further issues, we're here to help!

[rawsonl]

I am getting this exact error. I didn't have the build tools installed at all. I installed them.

Then the next error was this:

"java.exe exited with code 2"

I utilized this article and enabled multi-dex on to fix the error.
https://forums.xamarin.com/discussion/97803/getting-error-java-exe-exited-with-code-2