convertView is always null

When I implement a CustomeAdapter extends BaseAdapter to fill data on SwipeMenuListView, convertView parameter of getView method is always null. Thus, my SwipeMenuListView scroll is not smooth like normal Listview. Please help me to fix it, thank you very much!

Start by reproducing the issue with a custom BaseAdapter and inspect the getView interaction between convertView and SwipeMenuListView. Determine why convertView remains null during scrolling, then verify that the list recycles views and scrolls smoothly like a normal ListView.

Written by the indexing model from the issue text.