You can expand it in `getGroupView()` in your custom `Adapter`:
@Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { View v = super.getGroupView(groupPosition, isExpanded, convertView, parent); ExpandableListView mExpandableListView = (ExpandableListView) parent; mExpandableListView.expandGroup(groupPosition); return v; }

You can expand it in getGroupView in your custom adapter:
@Override public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { View v = super.getGroupView(groupPosition, isExpanded, convertView, parent); ExpandableListView mExpandableListView = (ExpandableListView) parent; mExpandableListView.expandGroup(groupPosition); return v; } Gluck!