Xamarin MvvmCross: Cannot Resolve v4.FragmentManager

Question

In my Xamarin Android, I want to resolve v4.fragment manager so, I'm resolving it in the following way

var ss = Mvx.Resolve<Android.Support.V4.App.FragmentManager>();

But, I'm getting error:

MvvmCross.Platform.Exceptions.MvxIoCResolveException: Failed to resolve type Android.Support.V4.App.FragmentManager
  at MvvmCross.Platform.IoC.MvxSimpleIoCContainer.Resolve (System.Type t) [0x0001c] in D:\git\MvvmCross\MvvmCross\Platform\Platform\IoC\MvxSimpleIoCContainer.cs:199 
  at MvvmCross.Platform.IoC.MvxSimpleIoCContainer.Resolve[T] () [0x00000] in D:\git\MvvmCross\MvvmCross\Platform\Platform\IoC\MvxSimpleIoCContainer.cs:189 
  at MvvmCross.Platform.Mvx.Resolve[TService] () [0x00005] in D:\git\MvvmCross\MvvmCross\Platform\Platform\Mvx.cs:34 
  at TJX.Core.IoC.MvxDependencyResolver.ResolveType[T] () [0x00001] in /Users/ali00261/Loyalty-MultiBanner-Mobile/TJX.Core/IoC/MvxDependencyResolver.cs:11 

Can anyone advice what am I doing wrong and how to resolve it ? Thanks.

UPDATE

I want to replace a FrameLayout in my MvxFragment<TViewModel> with a support.v4.fragment. ZXingScannerFragment is a support.v4.Fragment provided by 'ZXing' to scan barcode.

var scanFragment = new ZXingScannerFragment();
var ss = Mvx.Resolve<Android.Support.V4.App.FragmentManager>();
ss.BeginTransaction()
                    .Replace(Resource.Id.fragment_scancontainer, scanFragment)
                    .Commit();

My aim is to replace a view(frame layout) with a support.v4.Fragment

Answer 1

You can use the ChildFragmentManager to support managing Fragments inside of Fragments.

ChildFragmentManager.BeginTransaction()
   .Replace(Resource.Id.fragment_scancontainer, scanFragment)
   .Commit();

In terms of App.Fragment vs Support.V4.App.Fragment, it looks like you are using the wrong dependencies.

Mvvmcross offer two MvxFragment class type to match those offered in Android:

• Native Fragment - which can be found in MvvmCross.Droid.FullFragging nuget package and offers MvvmCross.Droid.FullFragging.Fragments.MvxFragment. This class matches to the native Android Fragment introduced in API 11.
• Support Library Fragmet - which can be found in MvvmCross.Droid.Support.V4 nuget package and offers MvvmCross.Droid.Support.V4.MvxFragment. This class matches to the Android Support Library Fragmets.

You need to use the Support Library Fragment version of MvxFragment in order to use Support.V4.App.Fragment with a ChildFragmentManager.