Android 用 .NET エラー XA1034
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.
csproj を直接編集し、"AndroidUseDesignerAssembly" を True
に変更します。