Simple way to Show a Fragment from within an MvxFragmentActivity

FragmentActivityBase.cs

using System;
using Cirrious.CrossCore;
using Cirrious.MvvmCross.Droid.Fragging;
using Cirrious.MvvmCross.Droid.Fragging.Fragments;
using Cirrious.MvvmCross.ViewModels;

namespace $NAMESPACE$
{
    public class FragmentActivityBase : MvxFragmentActivity
    {
        /// <summary>
        /// Show a Fragment with an unpopulated ViewModel.
        /// (Leverages <see cref="Mvx.IocConstruct{T}()"/> to construct the ViewModel on the fly.)
        /// </summary>
        /// <typeparam name="TFragment">The MvxFragment you wish to launch</typeparam>
        /// <typeparam name="TViewModel">The IMvxViewModel you wish to use</typeparam>
        /// <param name="frameLayout">The FrameLayout that the Fragment is being injected into</param>
        /// <remarks>TViewModel is constructed on the fly. 
        /// If you wish to pass in a pre-populated ViewModel, use <see cref="ShowFragment{TFragment}(IMvxViewModel, int)"/></remarks>
        /// <example>
        ///     ShowFragment{FooFragment, FooFragmentViewModel}(Resource.Id.ContentFrame); 
        /// </example>
        protected void ShowFragment<TFragment, TViewModel>(int frameLayout)
            where TFragment : MvxFragment
            where TViewModel : IMvxViewModel
        {
            var fragment = (TFragment)Activator.CreateInstance(typeof(TFragment));
            fragment.ViewModel = Mvx.IocConstruct<TViewModel>();
            SupportFragmentManager.BeginTransaction()
                                  .Replace(frameLayout, fragment)
                                  .Commit();
        }

        /// <summary>
        /// Show a Fragment with a pre-populated ViewModel
        /// </summary>
        /// <typeparam name="TFragment">The MvxFragment you wish to launch</typeparam>
        /// <param name="viewModel">The pre-populated ViewModel you wish to use</param>
        /// <param name="frameLayout">The FrameLayout that the Fragment is being injected into</param>
        /// <remarks> Use when you need to pass data into the ViewModel
        /// If you wish to have an unpopulated ViewModel constructed, use <see cref="ShowFragment{TFragment, TViewModel}(int)"/>
        /// </remarks>
        /// <example>
        ///     var viewModel = Mvx.IocConstruct{FooViewModel}();
        ///     viewModel.Bar = "This is the bar string."
        ///     ShowFragment{FooFragment}(viewModel, Resource.Id.ContentFrame);
        /// </example>
        protected void ShowFragment<TFragment>(IMvxViewModel viewModel, int frameLayout)
            where TFragment : MvxFragment
        {
            var fragment = (TFragment)Activator.CreateInstance(typeof(TFragment));
            fragment.ViewModel = viewModel;
            SupportFragmentManager.BeginTransaction()
                                  .Replace(frameLayout, fragment)
                                  .Commit();
        }
    }
}

Usage.cs

// create your own viewModel and pass it to the Fragment
var viewModel = new FooViewModel {Content = "some content"};
ShowFragment<FooFragment>(viewModel, Resource.Id.ContentFrame);


// construct a ViewModel and then populate 
//     - probably what you'll use when you have both
//       IMvxCommands in the Constructor of your ViewModel
//       AND you need to fill with data
var viewModel = Mvx.IocConstruct<FooViewModel>();
viewModel.Bar = "This is the bar string."
ShowFragment<FooFragment>(viewModel, Resource.Id.ContentFrame);

            
// have the viewModel constructed by Mvx.
ShowFragment<FooFragment, FooFragmentViewModel>(Resource.Id.ContentFrame);