Question

当前上下文中不存在名称“getSupportFragmentManager”

我的代码：

using Android.Views;
using Android.OS;
using Android.Support.V4.App;
using com.refractored;
using Android.Support.V4.View;

namespace XamarinStore
{
    public class HomeFragment : Android.App.Fragment
    {
        BadgeDrawable basketBadge;
        int badgeCount;

        public override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            RetainInstance = true;
            SetHasOptionsMenu(true);



            // Create your fragment here
        }

        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var HomePage = inflater.Inflate(Resource.Layout.HomeLayout, container, false);

            var pager = HomePage.FindViewById<ViewPager>(Resource.Id.pager);
            pager.Adapter = new MyPagerAdapter(SupportFragmentManager);


            var tabs = HomePage.FindViewById<PagerSlidingTabStrip>(Resource.Id.tabs);
            tabs.SetViewPager(pager);

            return HomePage;
        }
    }

    public class MyPagerAdapter : FragmentPagerAdapter{
        private  string[] Titles = {"Categories", "Home", "Top Paid", "Top Free", "Top Grossing", "Top New Paid",
            "Top New Free", "Trending"};

        public MyPagerAdapter(Android.Support.V4.App.FragmentManager fm) : base(fm)
        {
        }

        public override Java.Lang.ICharSequence GetPageTitleFormatted (int position)
        {
            return new Java.Lang.String (Titles [position]);
        }
        #region implemented abstract members of PagerAdapter
        public override int Count {
            get {
                return Titles.Length;
            }
        }
        #endregion
        #region implemented abstract members of FragmentPagerAdapter
        public override Android.Support.V4.App.Fragment GetItem (int position)
        {
            return SuperAwesomeCardFragment.NewInstance (position);
        }
        #endregion
    }
}

如何在片段中访问getSupportFragmentManager。

我正在使用xamarin跨平台开发工具..借助此来源的示例项目https://xamarin.com/c-sharp-shirt

在演示项目中，如果 BackStackEntryCount 计数等于零，则将屏幕切换到另一个片段..所以我用新的homefragment替换代码我决定在那里添加标签..所以我试图使用此组件“Material Pager Sliding Tab Strip”..在使用该组件时，它会因此错误而停止。 当前上下文中不存在名称'getSupportFragmentManager'

http://components.xamarin.com/view/PagerSlidingTabStrip

Answer 1

首先我继承HomeFragment到Android.Support.V4.App.Fragment

然后我使用ChildFragmentManager代替SupportFragmentManager

pager.Adapter = new MyPagerAdapter(ChildFragmentManager);

Answer 2

在Xamarin Android中，您应该能够使用FragmentManager访问此内容，并且您需要继承Android.Support.V4.App.Fragment 像这样：

 public class HomeFragment :  Android.Support.V4.App.Fragment
 {
    BadgeDrawable basketBadge;
    int badgeCount;

    public override void OnCreate(Bundle savedInstanceState)
    {
        base.OnCreate(savedInstanceState);
        RetainInstance = true;
        SetHasOptionsMenu(true);

        var count =  FragmentManager.BackStackEntryCount;

        // Create your fragment here
    }

Xamarin中的

getActivity等效项为Activity（例如，在继承自Android.Support.V4.App.Fragment的类中使用时）

Answer 3

你也可以这样做：

using Fragment = Android.Support.V4.App.Fragment;
using FragmentManager = Android.Support.V4.App.FragmentManager;


public class YourFragment : Fragment
{
//...

//To access to FragmentManager use base.FragmentManager
//Example:
base.FragmentManager.BeginTransaction()
    .Replace(Resource.Id.content_frame, fragment)
        .Commit();

//...
}

前两行（使用......）非常有用您只能使用支持中的Fragment和FragmentManager 并且你已经清楚不要将它们与普通的Fragment和FragmentManager混合使用。

Answer 4

我不熟悉 Xamarin ，但在原生Android开发中，您无法使用FragmentManager或Fragment方法从getFragmentManager访问getSupportFragmentManager。从 API 17 ，您可以调用getChildFragmentManager方法获取FragmentManager实例，该实例允许您管理来自其他片段的片段。

getChildFragmentManager().beginTransaction().add(...).commit();
getChildFragmentManager().executePendingTransactions();

Answer 5

public class HomeFragment：FragmentActivity

使用FragmentActivity扩展您的课程将解决您的问题

如何在片段中访问getSupportFragmentManager或SupportFragmentManager

5 个答案: