Programmatically collapse a group in ExpandableListView

Question

When I expand a new group, can I collapse the last one expanded?

score 122 · Accepted Answer · edited Jun 20 '13 at 12:14

122

Try putting this in your ExpandableListAdapter, listView is a reference to the ExpandableListView itself. And lastExpandedGroupPosition is a integer member variable defined inside your ExpandableListAdapter.

    @Override
    public void onGroupExpanded(int groupPosition){
        //collapse the old expanded group, if not the same
        //as new group to expand
        if(groupPosition != lastExpandedGroupPosition){
            listView.collapseGroup(lastExpandedGroupPosition);
        }

        super.onGroupExpanded(groupPosition);           
        lastExpandedGroupPosition = groupPosition;
    }

edited Jun 20 '13 at 12:14

Ragunath Jawahar

19,513
22
110
155

answered Nov 30 '10 at 15:06

danh32

6,234
2
38
39

2

No problem. Did this for an app a while back. Glad it could help someone else. – danh32 Nov 30 '10 at 16:48
4

There is a problem with your solution: the new expanded group will be scrolled as far as the height of the last group (which is closed). But thanks anyway. – Anh Tuan Feb 27 '12 at 05:00
To avoid keeping a instance variabel called lastExpandedGroupPosition you can simply loop over your whole lists index, and then close all which isn't the new group that is getting expanded. – Johan S Mar 23 '13 at 07:51
1

@JohanS isn't that overkill?To prevent keeping an int you loop through a potentially huge list – Juan Cortés Jun 07 '13 at 20:28

score 23 · Answer 2 · edited May 23 '17 at 12:10

23

Very helpful, but as Anh Tuan mentions in the comments above, I was having problems with the ExpandableListView not then scrolling back to the top of the currently selected group (it would stay at the currently scrolled position, in the middle of the group somewhere). You also need to add an onGroupClickListener() to scroll to the correct position:

@Override
public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition,
        long id) {
    // Implement this method to scroll to the correct position as this doesn't
    // happen automatically if we override onGroupExpand() as above
    parent.smoothScrollToPosition(groupPosition);

    // Need default behaviour here otherwise group does not get expanded/collapsed
    // on click
    if (parent.isGroupExpanded(groupPosition)) {
        parent.collapseGroup(groupPosition);
    } else {
        parent.expandGroup(groupPosition);
    }

    return true;
}

edited May 23 '17 at 12:10

Community

1
1

answered Nov 09 '12 at 09:55

cockadoodledo

371
1
3
10

Hey groupPosition is always return zero can you guide me – Ando Masahashi Apr 24 '14 at 13:17
Even though this technically does the trick, it doesn't look pretty. Any recommendations to make it look better? – erkinyldz Jun 19 '15 at 13:10
Okay I'm answering my own question. If you call parent.setSelection(groupPosition) it looks much better. Keep in mind, it needs to be called after group expanding or collapsing logic, not before. – erkinyldz Jun 19 '15 at 13:17

score 17 · Answer 3 · edited May 23 '17 at 12:10

17

This worked for me

expandableList.setOnGroupExpandListener(new OnGroupExpandListener() {
    int previousItem = -1;

    @Override
    public void onGroupExpand(int groupPosition) {
        if(groupPosition != previousItem )
            expandableList.collapseGroup(previousItem );
        previousItem = groupPosition;
    }
});

edited May 23 '17 at 12:10

Community

1
1

answered Jul 11 '13 at 06:39

Sathish

1,455
1
16
22

score 4 · Answer 4 · edited Oct 22 '12 at 10:09

4

Do this to expand the clicked group and collapse all others

public void onGroupExpand(int groupPosition)
{
    for (int i = 0; i < len; i++)
    {
        if (i != groupPosition)
        {
            expandableListDetailsLevel.collapseGroup(i);
        }
    }
}

It's working for me.

edited Oct 22 '12 at 10:09

Himanshu

31,810
31
111
133

answered Oct 22 '12 at 09:48

Driss Bounouar

3,182
2
32
49

score 2 · Answer 5 · answered Dec 17 '12 at 13:58

    @Override
    public void onGroupExpanded(int groupPosition) {
        for(int i=0;i<mGroupCollection.size();i++){
            if(i==groupPosition){
                System.out.println("Nothing");
                         }
            else{
                   mExpandableListView.collapseGroup(i);
            }

        }
        super.onGroupExpanded(groupPosition);
    }

Programmatically collapse a group in ExpandableListView

5 Answers5

Linked