Programmatically Expand/collapse Group

I want to display to the user a list of all the units and all their sub-units to select from in an ExpandableListView where they can check off which ones they want to move. Since

Solution 1:

I just recently went through this myself and finally got it all working properly on my end. I posted my original question here along with my final solution to get everything working properly. Not sure if that will help you out, but it sounds REAL close to the issue that I was having and using my solution, I was able to get it working properly.