android - 当我在 fragment 中使用 tablayout 和 viewpager 时出现问题

Question

您好，我在 fragment 中有一个 TabLayout 和 ViewPager

public class Explore : Android.Support.V4.App.Fragment, AppCompatActivity
    {
        private TabLayout tablayout;
        private ViewPager viewPager;
        private TimeBuget timeBuget;
        private SpecialActivity specialActivity;
        public override void OnCreate (Bundle savedInstanceState)
        {
            base.OnCreate (savedInstanceState);

            // Create your fragment here
        }

        public override View OnCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            // Use this to return your custom view for this Fragment
            // return inflater.Inflate(Resource.Layout.YourFragment, container, false);

            //return base.OnCreateView (inflater, container, savedInstanceState);
            return inflater.Inflate(Resource.Layout.ExploreLayout,container,false);

            viewPager = View.FindViewById<ViewPager> (Resource.Id.viewpagerExplore);
            setupViewPager (viewPager);

            tablayout = View.FindViewById<TabLayout> (Resource.Id.sliding_tabsExplore);
            tablayout.SetupWithViewPager (viewPager);
        }

        private void InditialFragment()
        {
            timeBuget = new TimeBuget ();
            specialActivity = new SpecialActivity ();
        }
        public void setupViewPager(ViewPager viewPager)
        {
            InditialFragment ();
            ViewPagerAdapter adapter = new ViewPagerAdapter (SupportFragmentManager);
            adapter.addFragment (timeBuget, "Explore");
            adapter.addFragment (specialActivity, "Featured");

            viewPager.Adapter=adapter;
        }
    }

1. 类不能有多个基类。
2. 如果我不使用 AppCompatActivity，那么我就不能使用 SupportFragmentManager

如何解决？

Answer 1

您必须在 Activity 中托管 fragment ，而不是同时使用两者。完成之后，您可以像这样访问 SupportFragmentManager:

ViewPagerAdapter adapter = new ViewPagerAdapter ((SpecialActivity as AppCompatActivity).SupportFragmentManager);