An ExpandableListView depends on an adapter to obtain its values. Those values come from some sort of data structure, often an ArrayList or even a simple array. In your onChildClick(), pass a reference to the data structure used to build your ExpandableListAdapter and modify the data structure directly, followed by a call to notifyDataSetChanged().

public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id)
{
        ExpandableListAdapter itemAdapter = parent.getExpandableListAdapter();
        String selectedItem = (String)itemAdapter.getChild(groupPosition, childPosition);
        groupHeader(selectedItem);
        if(parent.isGroupExpanded(groupPosition))
        {
            parent.collapseGroup(groupPosition);
        }
        // your logic here
        // expandableListArrayList.add() or expandableListArrayList.remove()
        // or whatever 
        itemAdapter.notifyDataSetChanged();

        return true;
    }
});

You probably have to extend the adapter to create the functionality you need. Your question is a bit nebulous because I can't see the overall structure of your code, but this should give you a running start.

Read More

first one you should be create your your custom adapter. once create a class like this.

public class ExpandableListParentClass{

    private Object parent;
    private ArrayList<Object> parentChildren;


    public ExpandableListParentClass() {
    }
    public ExpandableListParentClass(Object parent, ArrayList<Object> parentChildren) {
        this.parent = parent;
        this.parentChildren = parentChildren;
    }

    public Object getParent() {
        return parent;
    }

    public void setParent(Object parent) {
        this.parent = parent;
    }

    public ArrayList<Object> getParentChildren() {
        return parentChildren;
    }

    public void setParentChildren(ArrayList<Object> parentChildren) {
        this.parentChildren = parentChildren;
    }
}

and create your adapter

public class ExpandableListAdapter extends BaseExpandableListAdapter implements Filterable{

    private LayoutInflater inflater;
    private ArrayList<ExpandableListParentClass<Object>> mParent;
    private View view;


    public ArrayList<Object> getMParent() {
        return mParent;
    }



    public ExpandableListAdapter(Context context,
         ArrayList<ExpandableListParentClass<Object>> parentList ) {
        this.mParent = parentList;
        this.inflater = LayoutInflater.from(context);

    }

    // counts the number of group/parent items so the list knows how many
    // times calls getGroupView() method
    public int getGroupCount() {
        return mParent.size();
    }

    // counts the number of children items so the list knows how many times
    // calls getChildView() method
    public int getChildrenCount(int parentPosition) {
        int size =0;
        if(mParent.get(parentPosition).getParentChildren() != null){
        size = mParent.get(parentPosition).getParentChildren().size();
        }
        return size;
    }

    // gets the title of each parent/group
    public Object getGroup(int i) {
        return mParent.get(i).getParent();
    }

    // gets the name of each item
    public Object getChild(int parentPosition, int childPosition) {
        return mParent.get(parentPosition).getParentChildren().get(childPosition);
    }

    public long getGroupId(int parentPosition) {
        return parentPosition;
    }

    public long getChildId(int i, int childPosition) {
        return childPosition;
    }

    public boolean hasStableIds() {
        return true;
    }

    // in this method you must set the text to see the parent/group on the list

    public View getGroupView(int parentPosition, boolean b, View view, ViewGroup viewGroup) {
        if (view == null) {
            view = inflater.inflate(R.layout.layout_listview, viewGroup, false);
        }

        return view;

    }

    // in this method you must set the text to see the children on the list

    public View getChildView(int parentPosition, int childPosition, boolean b, View view, ViewGroup viewGroup) {
        if (view == null) {
        view = inflater.inflate(R.layout.layout_listview, viewGroup, false);
        }



        // return the entire view
        return view;
    }

    public boolean isChildSelectable(int i, int i1) {
        return true;
    }

    }



 now fill to list


      List<ExpandableListParentClass> arrayParents = new ArrayList<ExpandableListParentClass>();
      ExpandableListParentClass item = new ExpandableListParentClass();
      item.setParent(yourParentItem);
      item.setParentChildren( yourChildList);

after that when you need to add child

ExpandableListView myExpList= (ExpandableListView) this.view.findViewById(R.id.yourExpListView);

ExpandableListAdapter adapter = 
        (ExpandableListAdapter) myExpList.getExpandableListAdapter();

( (ExpandableListParentClass)adapter.getMParent().get(0) ).getParentChildren().add(object);
//(change to get(0) which you parent want to get )
adapter.notifyDataSetChanged();
adapter.notifyDataSetInvalidated();

Read More

I used a hashmap to store references of all children when they were created in getChildView. In my custom adapter, I declared:

private HashMap<String, View> childviewReferences = new HashMap<String, View>();

public View getChildView(int groupPosition, int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {

    final String childStr = (String) getChild(groupPosition, childPosition);

       LayoutInflater inflator = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);//context.getLayoutInflater();

    convertView = inflator.inflate(R.layout.childlayout, null);

     TextView textview = (TextView) convertView.findViewById(R.id.childname);
                textview.setText(childStr);
    childviewReferences.put(Integer.toString(groupPosition) + Integer.toString(childPosition), convertView);

        return convertView;
    }

Child OnClick Listener

list.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

              @Override
              public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) {

CreatePizzaAdapter adapter = (CreatePizzaAdapter) parent.getExpandableListAdapter();

        View conv = adapter.getChildviewReferences().get(Integer.toString(groupPosition) + Integer.toString(childPosition));

                    //now you can find any view and child and do anything
                        return true;
                    }
                });

Read More

Try this:

@Override
public boolean onChildClick(ExpandableListView parent, View v,
                int groupPosition, int childPosition, long id)
{
  int iCount;
  int iIdx;
  Object item;

  CreatePizzaAdapter adapter = (CreatePizzaAdapter) parent.getExpandableListAdapter();

  iCount = adapter.getChildrenCount(groupPosition);
  for ( iIdx = 0; iIdx < iCount; ++iIdx )
  {
    item = adapter.getChild(groupPosition, iIdx);
    if ( item != null )
    {
      // Here you would cast item to the appropriate type for this row

      if ( iIdx == childPosition )
      {
        // Here you would toggle checked state in the data for this item
      }
      else
      {
        // Here you would clear checked state in the data for this item
      }
    }
  }
  parent.invalidateViews(); // Update the list view
}

Read More

Well, assuming your adapter is correctly implementing its methods...

    expandableListView.setOnChildClickListener(new OnChildClickListener() {

        @Override
        public boolean onChildClick(final ExpandableListView parent, final View view, final int groupPosition, final int childPosition,
                final long identifier) {

            final Object childObj = parent.getExpandableListAdapter().getChild(groupPosition, childPosition);

            if (childObj != null) {

                // Do your magic
            }

            return true;
        }
    });

Read More