Xamarin.Android DialogFragment some LifeCycle Events not firing

Question

I am having an issue working with Xamarin.Android (please see code below)

MainActivity.cs:

using Android.App;
using Android.Widget;
using Android.OS;

namespace DialogFragmentLife
{
    [Activity(Label = "DialogFragmentLife", MainLauncher = true)]
    public class MainActivity : Activity
    {
        private Button _btnShowDF;
        private DialogFragmentLife _dfLife;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);

            SetContentView(Resource.Layout.Main);

            _btnShowDF = FindViewById<Button>(Resource.Id.btnShowDF);
            _btnShowDF.Click += _btnShowDF_Click;
        }

        private void _btnShowDF_Click(object sender, System.EventArgs e)
        {
            _dfLife = new DialogFragmentLife(this);

            _dfLife.Show(FragmentManager, "dfLife");
        }
    }
}

And the DialogFragmentLife.cs below

using Android.App;
using Android.Content;
using Android.OS;
using Android.Views;

namespace DialogFragmentLife
{
    class DialogFragmentLife : DialogFragment
    {
        private Context _context;

        public DialogFragmentLife(Context context)
        {
            _context = context;
        }

        public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
        {
            base.OnCreateView(inflater, container, savedInstanceState);

            RetainInstance = true;

            View view = inflater.Inflate(Resource.Layout.DialogFragmentLife, container, false);

            return view;
        }

        public override void OnDismiss(IDialogInterface dialog)
        {
            base.OnDismiss(dialog);
        }

        public override void OnPause()
        {
            base.OnPause();
        }

        public override void OnStop()
        {
            base.OnStop();
        }

        public override void OnHiddenChanged(bool hidden)
        {
            base.OnHiddenChanged(hidden);
        }

        public override void OnDestroyView()
        {
            Dialog dialog = Dialog;

            if (dialog != null && RetainInstance)
                dialog.SetDismissMessage(null);

            base.OnDestroyView();
        }

        public override void OnDetach()
        {
            base.OnDetach();
        }

        public override void OnCancel(IDialogInterface dialog)
        {
            base.OnCancel(dialog);
        }
    }
}

Everything works as expected, except for the DialogFragment's lifecycle events when it is being dismissed, or when the devices are rotated (orientation change), none of the LifeCycle events get fired.

As you can see on the code,

• OnDismiss
• OnPause
• OnStop
• OnHiddenChanged
• OnDestroyView
• OnDetach
• OnCancel

None of them gets fired. I wonder if anyone out there is having this same issue.

Answer 1

After more scouring around the net, i manage to get some events fired now by doing the following:

On MainActivity.cs i changed

using Android.App;

to

using Android.Support.V7.App;

---

Then, on DialogFragmentLife.cs i changed

using Android.App;

to

using Android.Support.V4.App;

---

Lastly, back on MainActivity.cs, instead of showing the DialogFragment by using

_dfLife.Show(FragmentManager, "dfLife");

i changed it to use the SupportFragmentManager as follows

_dfLife.Show(SupportFragmentManager, "dfLife");

From there on, the OnDestroyView() is now fired when i rotate the screen, also when dismissing the Dialog Fragment