问题
Not that I'm complaining, but...
I was having trouble compiling my Android project and I went nuclear and deleted all of my "Xamarin.Android.Support" packages. When I next compiled, a dialog popped up in VS and I was asked to install some Android stuff and now it compiles fine.
Except, there are no longer any package references to these official packages.
What just happened...?
来源：https://stackoverflow.com/questions/55026783/why-does-my-android-project-compile-without-any-standard-package-references