Change expandable indicator in ExpandableListView

Question

Trying to create an ExpandableListView. The initial view with the groups shows up fine. However, when I click the list item, my arrow does not change. See the images below.<

Answer 1

I am a bit late to the party but my requirement was something similar to this but something was different.

I had 3 requirements:

1. if a group have child then show down_arrow (V)
2. if a group doesn't have a child then no arrow/image
3. if a group with child expanded then show up_arrow (^)

To achieve something similar to this:

1. Your ExpandableListView will look something similar to this with android:groupIndicator null

2. Your group/header layout will look something like this with text and image at the end:

3. In your BaseExpandableListAdapter's getGroupView() method, use

        if (Objects.requireNonNull(expandableListDetail.get(expandableListTitle.get(listPosition))).size() > 0) {
        if (isExpanded) {
            ivIcon.setImageResource(R.drawable.arrow_up);
        } else {
            ivIcon.setImageResource(R.drawable.arrow_down);
        }
    }
   

Where, expandableListTitle is group and expandableListDetail is its children