[Mono-dev] Update a data on a list

LaureneF lfaurevidal at algoria.fr
Thu Feb 14 17:52:50 UTC 2013

In my application, I display a list of contacts with their name, picture, and
presence status. 
The application receives an event everytime a contact changes his presence,
and what I am trying to do is to update the list with the contact's new

This is how I bind my list to a custom list adapter:

 ListView listView;
 listView = FindViewById<ListView>(Resource.Id.List);
 listView.Adapter = new ContactListAdapter(this, names);
And this is a part of the GetView of my ContactListAdapter
 public override View GetView(int position, View convertView, ViewGroup
            var item = this.contacts.ElementAt(position);
            var view = convertView; // re-use an existing view, if one is
           // if (view == null || !(convertView is LinearLayout)) //
otherwise create a new one
                view =
context.LayoutInflater.Inflate(Resource.Layout.contactItemView, parent,
            var p = context;
            var imageItem = view.FindViewById(Resource.Id.presence) as
          string status = null;
            foreach (CPresenceInfo pres in item.Presences)
                if (pres.Type.ToString().Equals("TWS")) status =
            if (status != null)
                if (status.Equals("ONLINE"))
                if (status.Equals("BUSY"))
                if (status.Equals("ABSENT"))
                if (status.Equals("OFFLINE"))

            return status;

            return view;

And the method that receives the event:
        void CEventParser_OnPresenceChangedEvent(string personGuid,
CPresenceInfo presence)
                //Update the contact row or the entire list??

I don't know if I can update just one row in the list, or if I have to
update the entire list. But in both cases I don't know how to do...
I know there is a NotifyDataSetChanged() method but I don't know how and
where to use it.

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