计划类型已存在: Xamarin.Android项目中出现android.support.annotation.PluralsRes错误

using Android.App;
using Android.Content;
using Android.OS;
using Android.Support.Annotation;

namespace MyApp
{
    [Activity(Label = "@string/app_name")]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.Main);

            // 使用了android.support.annotation.PluralsRes
            var pluralsRes = PluralsRes.MyPlural;
        }
    }
}

using Android.App;
using Android.Content;
using Android.OS;
using AndroidX.Annotation;

namespace MyApp
{
    [Activity(Label = "@string/app_name")]
    public class MainActivity : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.Main);

            // 使用了AndroidX.Annotation.PluralsRes
            var pluralsRes = PluralsRes.MyPlural;
        }
    }
}