ExpandableListView Child Events

Question

I am trying to detect and handle the selection of a child in an ExpandableListView. But none of the event handlers or listeners I've tried ever seem to fire. Which one am I to use? I've tried:

lv.Click += HandleSelect

and

lv.ItemClick += HandleSelect

and

lv.ChildClick += HandleSelect

and

lv.ItemSelected += HandleSelect

and

lv.SetOnChildClickListener(new ChildClick)

HandleSelect Event Handler

void HandleSelect(Object o, EventArgs e)
{
   var obj = o;  //Breakpoint set here and it never breaks for any of the above;
}

ChildClick listener

class ChildClick : ExpandableListView.IOnChildClickListener
{
 public void Dispose()
        {

        }

        public IntPtr Handle
        {
            get { return new IntPtr(0); }
        }

        public bool OnChildClick(ExpandableListView parent, View clickedView, int groupPosition, int childPosition, long id)
        {
            var clicked = clickedView; //Breakpoint set here, never breaks;
            return true;
        }
}

Here is the BaseExpandableListAdapter I am using to populate the ExpandableListView

 class MarketAdapter : BaseExpandableListAdapter
{
    private readonly Context _context;
    private readonly string[] _stores;
    private readonly List<string> _storeList = new List<string>();
    private readonly List<List<Call>> _calls = new List<List<Call>>(); 

    public MarketAdapter(Context context, IEnumerable<Call> calls)
    {
        _context = context;

        List<Call> marketCalls =
            (from c in calls
             where c.InProgress == "0"
             select new Call() {CallNumber = c.CallNumber, ServiceType = c.ServiceType, Priority = c.Priority, Address = c.Address, City = c.City, Contact = c.Contact, Description = c.Description, Phone = c.Phone, Site = c.Site, State = c.State}).ToList();

        foreach (IGrouping<string, Call> stores in marketCalls.GroupBy(s => s.Site))
        {                
            _storeList.Add(stores.Key + "," + stores.First().City + "," + stores.First().State);
            List<List<Call>> callgroup = new List<List<Call>>();
            List<Call> call = new List<Call>(from c in stores select new Call() {CallNumber = c.CallNumber, ServiceType = c.ServiceType, Priority = c.Priority, Description = c.Description});
            callgroup.Add(call);
            _calls.Add(call);
        }
        _stores = _storeList.ToArray();
    }

    public override Object GetChild(int groupPosition, int childPosition)
    {
        return null;
    }

    public override long GetChildId(int groupPosition, int childPosition)
    {
        return childPosition;
    }

    public override int GetChildrenCount(int groupPosition)
    {
        return _calls.ElementAt(groupPosition).Count;
    }

    public override View GetChildView(int groupPosition, int childPosition, bool isLastChild, View convertView, ViewGroup parent)
    {
        List<Call> callList = _calls.ElementAt(groupPosition);
        Call _call = callList.ElementAt(childPosition);

        if (convertView == null)
        {
            LayoutInflater inflater = (LayoutInflater) _context.GetSystemService(Context.LayoutInflaterService);
            convertView = inflater.Inflate(Resource.Layout.listviewchild, null);
        }

        TextView call = (TextView) convertView.FindViewById(Resource.Id.Call);
        call.Text = _call.CallNumber;
        TextView type = (TextView) convertView.FindViewById(Resource.Id.Type);
        type.Text = _call.ServiceType;
        TextView priority = (TextView) convertView.FindViewById(Resource.Id.Priority);
        priority.Text = _call.Priority;
        TextView description = (TextView) convertView.FindViewById(Resource.Id.Description);
        description.Text = _call.Description;

        return convertView;
    }

    public override Object GetGroup(int groupPosition)
    {
        return _stores[groupPosition];
    }

    public override long GetGroupId(int groupPosition)
    {
        return groupPosition;
    }

    public override View GetGroupView(int groupPosition, bool isExpanded, View convertView, ViewGroup parent)
    {
        string[] info = _stores[groupPosition].Split(new [] { "," }, StringSplitOptions.None);
        string _site = info[0];
        string _city = info[1];
        string _state = info[2];

        if (convertView == null)
        {
            LayoutInflater inflater = (LayoutInflater) _context.GetSystemService(Context.LayoutInflaterService);
            convertView = inflater.Inflate(Resource.Layout.listviewparent, null);
        }

        TextView site = (TextView) convertView.FindViewById(Resource.Id.Site);
        site.Text = _site;
        TextView city = (TextView) convertView.FindViewById(Resource.Id.City);
        city.Text = _city;
        TextView state = (TextView) convertView.FindViewById(Resource.Id.State);
        state.Text = _state;

        return convertView;
    }

    public override bool IsChildSelectable(int groupPosition, int childPosition)
    {
        return true;
    }

    public override int GroupCount
    {
        get { return _stores.Length; }
    }

    public override bool HasStableIds
    {
        get { return true; }
    }
}

EDIT: Also just tried the solution explained here OnChildClick inside ExpandableListActivity does not fire by setting the Layout and all of my TextViews focusable attrubute to false in listviewchild.axml but it still doesn't fire the listener.

score 2 · Accepted Answer · answered Jun 27 '12 at 18:05

2

I changed

void HandleSelect(Object o, EventArgs e)
{
  //do something
}

to

void HandleSelect(object o, ExpandableListView.ChildClickEventArgs e)
{
  //do something
}

and it is working.

answered Jun 27 '12 at 18:05

jmease

2,507
5
49
89

I am having hard time implementing ExpandableListView onClick in Xamarin.Android, did you use : SetOnChildClickListener? – Signcodeindie Mar 11 '14 at 12:19

score 1 · Answer 2 · answered Jun 27 '12 at 16:46

1

Use an onChildClickListener, but you need to call it from the ExpandableListView class, like this:

lv.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { 
        @Override 
        public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)  
        }); 
}

answered Jun 27 '12 at 16:46

Barak

16,318
9
52
84

ChildClick is an ExpandableListView.IOnChildClickListener. – jmease Jun 27 '12 at 16:56
Never said it wasn't. But, my answer works for me, so give it a try and see what happens. – Barak Jun 27 '12 at 17:06
That syntax doesn't work in MonoDroid. http://stackoverflow.com/questions/6876538/how-to-make-an-animation-listener-in-monodroid – jmease Jun 27 '12 at 17:16
Really? Wow. I wouldn't use something that causes documented Android framework functions to not work. Good luck! – Barak Jun 27 '12 at 17:55
Got the ChildClick event to work. Still not sure why the listener would never fire though. – jmease Jun 27 '12 at 18:07
Glad to hear it! Sorry I wasn't able to be more helpful. – Barak Jun 27 '12 at 19:09

score 0 · Answer 3 · answered Oct 16 '13 at 11:50

0

I experienced the same problem.

In my listviewchild I had the xml attribute:

android:clickable="true"

Which silently consumed the event. Removing the attribute enabled the ChildClick Eventhandler.

answered Oct 16 '13 at 11:50

jonte

46
6

ExpandableListView Child Events

3 Answers3