Erro XA1034 do .NET para Android
Your project references 'Foo.dll' which uses the `_Microsoft.Android.Resource.Designer` assembly, but you do not have this feature enabled. Please set the `AndroidUseDesignerAssembly` MSBuild property to `true` in your project file.
Edite seu csproj diretamente e altere o 'AndroidUseDesignerAssembly' para True
.