Using ViewPager / ChildFragmentManager with Android 4.0 and 4.1 - android-fragments

Question

My Xamarin Android app uses fragments for each view rather than separate activities, and one of the fragments needs to contain a ViewPager for a photo slider.
From everything I've seen, the ViewPager has to bind to an adapter that uses fragments. This is problematic because this means I have a fragment within a fragment, which has to use the ChildFragmentManager, which isn't supported in versions prior to Android 4.2. My app needs to work on Android 4.0+, so I need guidance on how to work around this issue.
Some lines of thought I had...
Is there a way to bind some other kind of adapter to a ViewPager that doesn't use fragments? In my case all I need is to show an ImageView as each item, so a fragment seems overkill and obviously has the 4.2+ issue.
Is there some other control that I could use besides ViewPager that would give me the desired UX (list of photos sliding left/right) without relying on child fragments?
Is there a way to make ChildFragmentManager work with Android 4.0 and 4.1?
Current code to setup the ViewPager with only Android 4.2+ support:
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="200dip"
android:id="#+id/property_details_image_gallery" />
private ViewPager gallery;
gallery = view.FindViewById<ViewPager> (Resource.Id.property_details_image_gallery);
gallery.Adapter = new ImagePagerAdapter (ChildFragmentManager, 0, facts.PhotoUris);
gallery.SetOnPageChangeListener (this);
public class ImagePagerAdapter : FragmentPagerAdapter
{
private int resourceId;
private List<string> photos;
public ImagePagerAdapter (FragmentManager fragmentManager, int resourceId, List<string> photos) : base(fragmentManager)
{
this.resourceId = resourceId;
this.photos = photos;
if (photos.Count == 0)
photos.Add (string.Empty); // If there are no photos, we add a single photo that will result in a 'noimage' photo
}
public override Fragment GetItem (int position)
{
// Instantiate a new fragment
ImageGalleryFragment fragment = new ImageGalleryFragment (photos[position], position);
return fragment;
}
public override long GetItemId (int position)
{
return position;
}
public override int Count {
get {
return photos.Count;
}
}
}
I just started using Xamarin 3 days ago, so please be gentle. :)

Answer 1

I was able to get this working by having ImagePagerAdapter inherit directly from PagerAdapter.
public class ImagePagerAdapter : PagerAdapter {
private List<string> data;
private Context context;
public ImagePagerAdapter(Context context, List<string> data) {
this.context = context;
this.data = data;
}
public override Java.Lang.Object InstantiateItem(View collection, int position) {
// Create new image view
var uri = data [position];
var imageView = new ImageView(context);
var defaultImage = context.Resources.GetDrawable (Resource.Drawable.noimage);
imageView.SetUrlDrawable (uri, defaultImage);
// Add image view to pager
var viewPager = collection as ViewPager;
viewPager.AddView(imageView);
return imageView;
}
public override void DestroyItem(View collection, int position, Java.Lang.Object view) {
var viewPager = collection as ViewPager;
viewPager.RemoveView(view as View);
}
public override bool IsViewFromObject(View view, Java.Lang.Object obj) {
return view == obj;
}
public override IParcelable SaveState() {
return null;
}
public override void StartUpdate(View arg0) {
}
public override void FinishUpdate(View arg0) {
}
public override int Count {
get {
return data != null ? data.Count : 0;
}
}
}