Question

Is there a way to change an imageview within my group row when the group is expanded?

I am looking for a way to do this via the code.

Cheers for any tips

EDIT: This is what I am trying to use at the moment, but it does not swap the image

    private static final int[] EMPTY_STATE_SET = {};
    private static final int[] GROUP_EXPANDED_STATE_SET = {android.R.attr.state_expanded};
    private static final int [] [] GROUP_STATE_SETS = {
        EMPTY_STATE_SET, //0
        GROUP_EXPANDED_STATE_SET //1
    };

    public View getGroupView (int groupPosition,
        boolean isExpanded,
        View convertView,
        ViewGroup parent) {

        View v = getGroupView( groupPosition, isExpanded, convertView, parent);
        View ind = v.findViewById(R.id.explist_indicator);
        if(ind != null){
            ImageView indicator = (ImageView) ind;
            indicator.setVisibility( View.VISIBLE );
            int stateSetIndex = ( isExpanded ? 1:0);
            Drawable drawable = indicator.getDrawable();
            drawable.setState(GROUP_STATE_SETS[stateSetIndex]);
        }
        return v;
    }

Answer 1

Use a custom BaseExpandableListAdapter. Override getGroupView and use the isExpanded boolean parameter to identify when the group view is expanded (and set your ImageView accordingly).