Xamarin.Android提示找不到mono.Android.Support.v4

Xamarin.Android提示找不到mono.Android.Support.v4

錯誤信息：Error: Exception while loading assemblies: System.IO.FileNotFoundException:
Could not load assembly ‘Mono.Android.Support.v4, Version=0.0.0.0, Culture=neutral, PublicKeyToken=84e04ff9cfb79065’.
Perhaps it doesn’t exist in the Mono for Android profile
從Xamarin.Android 5.1開始，已經沒有mono.Android.Support.v4了，使用Xamarin.Android.Support.v4替代。因此，須要使用NuGet安裝該組件。