如何为带有复选框的微调器添加自定义onClicklistener

I've been trying to implement a multi-select spinner on my own. So the problem is I'm able to select the checkboxes but when I close and open the spinner again, the selected checkboxes get deselected. So I thought I would implement my own itemclick listener to the spinner and use the positions to check the checkboxes. Now, my spinner is not dropping down. I've been trying to implement a multi-select sp