Android v22.2 Tabs and ViewPager in MvvmCross

MainLayout.xaml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:layout_scrollFlags="scroll|enterAlways" />
        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="16dp"
            app:tabGravity="center"
            app:tabMode="scrollable" />
    </android.support.design.widget.AppBarLayout>
    <android.support.v4.view.ViewPager
        android:id="@+id/viewpager"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>

MainLayoutFragment.cs

public class SomeFragment : MvxFragment<SomeViewModel>
    {
        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            var view = base.OnCreateView(inflater, container, savedInstanceState);

            var viewPager = view.FindViewById<Android.Support.V4.View.ViewPager>(Resource.Id.viewpager);
            if (viewPager != null)
            {
                var fragments = new List<MvxViewPagerFragmentAdapter.FragmentInfo>
                {
                    new MvxViewPagerFragmentAdapter.FragmentInfo
                    {
                        FragmentType = typeof(SomeFragment1),
                        Title = "",
                        ViewModel = ViewModel.ViewModelSomething1
                    },
                    new MvxViewPagerFragmentAdapter.FragmentInfo
                    {
                        FragmentType = typeof(SomeFragment2),
                        Title = ViewModel.ViewModelPopular.TextSource.GetText("Title"),
                        ViewModel = ViewModel.ViewModelSomething2
                    },
                    new MvxViewPagerFragmentAdapter.FragmentInfo
                    {
                        FragmentType = typeof(SomeFragment3),
                        Title = ViewModel.ViewModelContributors.TextSource.GetText("Title"),
                        ViewModel = ViewModel.ViewModelSomething3
                    }
                };
                viewPager.Adapter = new MvxViewPagerFragmentAdapter(Activity, ChildFragmentManager, fragments);
            }

            var tabLayout = view.FindViewById<TabLayout>(Resource.Id.tabs);
            tabLayout.SetupWithViewPager(viewPager);

            return view;
        }
    }

MvxViewPagerFragmentAdapter.cs

public class MvxFragmentStatePagerAdapter
        : FragmentStatePagerAdapter
    {
        private readonly Context _context;

        public IEnumerable<FragmentInfo> Fragments { get; private set; }

        public override int Count
        {
            get { return Fragments.Count(); }
        }

        protected MvxFragmentStatePagerAdapter(IntPtr javaReference, JniHandleOwnership transfer)
            : base(javaReference, transfer)
        {
        }

        public MvxFragmentStatePagerAdapter(
            Context context, FragmentManager fragmentManager, IEnumerable<FragmentInfo> fragments)
            : base(fragmentManager)
        {
            _context = context;
            Fragments = fragments;
        }

        public override Fragment GetItem(int position)
        {
            var fragmentInfo = Fragments.ElementAt(position);
            var fragment = Fragment.Instantiate(_context,
                FragmentJavaName(fragmentInfo.FragmentType));
            ((MvxFragment)fragment).ViewModel = fragmentInfo.ViewModel;
            return fragment;
        }

        protected static string FragmentJavaName(Type fragmentType)
        {
            var namespaceText = fragmentType.Namespace ?? "";
            if (namespaceText.Length > 0)
                namespaceText = namespaceText.ToLowerInvariant() + ".";
            return namespaceText + fragmentType.Name;
        }

        public override ICharSequence GetPageTitleFormatted(int position)
        {
            return new Java.Lang.String(Fragments.ElementAt(position).Title);
        }

        public class FragmentInfo
        {
            public string Title { get; set; }

            public Type FragmentType { get; set; }

            public IMvxViewModel ViewModel { get; set; }
        }
    }

Awesome!!!

Thanks

throwing this exception for me

Android.Support.V4.App.Fragment+InstantiationException: Unable to instantiate fragment shifa4u.android.views.account.LabTestResults: make sure class name exists, is public, and has an empty constructor that is public

though i have an empty constructor on LabTestResults fragment , it is MvxFragment< LabTestResultViewModel >

Binding is not working for ViewPager's fragment....

I really sorry, i'm new in mvvmcross and i need to use a tablayout with a viewpager, the quantity of tab is depends of the quantity of object in a list, i tried to use this solution but i don't know how to call the SomeFragment class in the main activity to build the tab and viewpager elements, some idea ?

@shahid-pk I am also getting the same error

Android.Support.V4.App.Fragment+InstantiationException: Unable to instantiate fragment .....: make sure class name exists, is public, and has an empty constructor that is public

Did you manage to solve the issue?

Edit
solution is to change the FragmentJavaName method to:

protected static string FragmentJavaName(Type fragmentType)
{
    return Java.Lang.Class.FromType(fragmentType).Name;
}

Why isn't MvxFragmentStatePagerAdapter include in MvvmCross library?