Why is my BaseAdapter class not incrementing the position in getView?

This error will happen if you put a ListView inside a ScrollView. ListView itself does vertical scroll so it must not be put into a ScrollView.

An adapter will call getView when listView needs a new item to show. So, if your listView has no scroll, no new item will be created, and no call to getView will be made.
But you should not store all spinner objects, or create new objects in getView. That`s because it will be slow and maybe waste of memory.