MvvmCross Android app with dynamic fragments

It’s not much different than implementing the app with Java, except using the MvvmCross MvxXXXX classes.
Let’s do a simple exercise: have an activity loading a fragment by code behind.
Here’s the code we need:

1. a MvxFragmentActivity derived class.  It is the corresponding to Android’s FragmentActivity class

[Activity(Label = "View for FirstViewModel")]
public class FirstView : MvxFragmentActivity
{
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
SetContentView(Resource.Layout.FirstView);
this.AddChildView ();
}
void AddChildView()
{
var childView = new ChildView () {
ViewModel = new ChildViewModel()
};
var fm = this.SupportFragmentManager;
var ft = fm.BeginTransaction ();
ft.Add (Resource.Id.childViewHost, childView, "childView");
ft.Commit ();
}

2. a corresponding Android layout for it: FirstView.axml
  it needs to have a host widget for the fragment, let’s say a FrameLayout called childViewHost
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/childViewHost" />
</FrameLayout >
 
  3. a MvxFragment derived class. Note the MvvmCross BindingInflate method which makes binding work in the fragment
public class ChildView : MvxFragment
{
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
var ignored = base.OnCreateView(inflater, container, savedInstanceState);
return this.BindingInflate(Resource.Layout.ChildView, null);
}
}
4. a corresponding Android layout  for it: ChildView.axml. Let’s have a textbox bound to the ViewModel’s property
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:local="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
local:MvxBind="Text Hello"
android:textAppearance="?android:attr/textAppearanceSmall"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/textView2" />
</LinearLayout>