A listItemClickListener is attached to a listview. When you changed fromListActivity to Activity, your class no longer has a view associated with it and thus an Activity class has no idea what to do with an onListItemClickListener.
For a non-ListActivity to have an item-clicked-listener for a list, you have to call the setOnItemClickedListener method on the ListView (you may need to get that using findViewById if it's coming from XML). Rather than just overriding ListActivity's onListItemClickListener, here you'd have your invoking activity implement AdapterView. OnItemClickedListener and pass it as the parameter to setOnItemClickedListener.
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