我有这个代码：

using Android.App;
using Android.Content;
using Android.OS;
using MvvmCross;
using MvvmCross.Droid.Support.V7.AppCompat;
using MvvmCross.Forms.Views;
using MvvmCross.ViewModels;
using System;
using Xamarin.Forms.Platform.Android;

[....]

private void SetupPage()
        {
            if (_pageType == null) throw new NullReferenceException("ContentPage type can't be null. Call SetTypes() before creating the Intent");
            if (_viewModelType == null) throw new NullReferenceException("ViewModel type can't be null. Call SetTypes() before creating the Intent");

            var viewModel = Mvx.IoCProvider.Resolve(_viewModelType) as IMvxViewModel;

            var page = Activator.CreateInstance(_pageType) as MvxContentPage ?? 
                       Mvx.IoCProvider.Resolve(_pageType) as MvxContentPage;

            if(page == null || viewModel == null)
                return;
            
            page.ViewModel = viewModel;

            var fragment = page.CreateSupportFragment(this);
            SupportFragmentManager
                .BeginTransaction()
                .Replace(Resource.Id.fragment_container, fragment)
                .Commit();
        }

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我尝试使用Android.Support.V4.App.Fragment fragment更新var fragment，但在此行出现此错误：

• 无法将类型“AndroidX.Fragment.App.Fragment”隐式转换为“Android.Support.V4.App.Fragment”*

的数据