Question

I need to know how to change background of expanded list item when it is actually expanded. We have ListItem which is expanded and opens another items, but we still see this parent item. I need to change its color.

Answer 1

Use listeners to change them.

listView.setOnGroupExpandListener(new OnGroupExpandListener() { 
    @Override 
    public void onGroupExpand(int groupPosition) { 
        // code to set your background to your expanded color
    } 
}); 

listView.setOnGroupCollapseListener(new OnGroupCollapseListener() { 
    @Override 
    public void onGroupCollapse(int groupPosition) { 
        // code to set your background back to your collapsed color
    } 
});