CODEWITHSUNDEEP
androidexpandablelistview
Vikky
Vikky

Reputation: 943

the getChildView method run 2 times in Expandable ListView

i am creating an app which contains an expandable list view. the child views are created dynamically. and it run successfully. During debugging i found that the getChildview function runs 2 times.

i create dynamic layouts and put it into a list. when the getChildView runs 2 times the layouts added 2 times in to the list..

Upvotes: 3

Views: 2600

Answers (5)

rajesh
rajesh

Reputation: 1

one thing worked for me was. 

@Override
public boolean hasStableIds() {
    // To avoid refreshing return true and makesure Ids each position have same view.
    return true;
    //return false;
}

Upvotes: 0

Umesh
Umesh

Reputation: 1609

The height of the listview should be match_parent instead of wrap_content.

Upvotes: 0

pechkin
pechkin

Reputation: 1

I'm new to android development and maybe wrong, but as I see it getChildView() has 4th argument View convertView which is null first time view need to be rendered. Once created it is stored and reused again when needed. So if you create new views in getChildView() it is enough to have something like this

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {
  if (convertView != null) {
      // View is already created here, update it if you like
      return convertView;
  }
  // Else create your view(s) here and return the root of view container as usual
  ...
  return convertView; // or whatever your root view is
}

Upvotes: 0

mahbubcsedu
mahbubcsedu

Reputation: 158

If you regenerate the list in group click, then removing it can be a solution. For example, in the following code, the getChildView() always called twice because of myList.expandGroup(groupPosition). 

public boolean onGroupClick(ExpandableListView parent, View v,
            int groupPosition, long id) {

        //get the group header
        HeaderInfo headerInfo = medicationDate.get(groupPosition);
        myList.expandGroup(groupPosition);
        //set the current group to be selected so that it becomes visible
        //myList.setSelectedGroup(groupPosition);
        //display it or do something with it
        Toast.makeText(getBaseContext(), "Child on Header " + headerInfo.getHeaderInfo()+"with childsize"+headerInfo.getChildInfo().size(), 
                Toast.LENGTH_SHORT).show(); 

        return false;
    }

Upvotes: 0

class stacker
class stacker

Reputation: 5347

getChildView() is not an appropriate place to create children. It might be called pretty often. The rendering process needs to visit children twice, anyway.

It's not possible to judge where the appropriate place would be for adding children to your list, or even if your list approach is the right way to do it, without much more information.

Upvotes: 1

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