notifyDataSetChanged不是ListAdapter的方法，而是BaseAdapter的方法(ArrayAdapter是BaseAdapter的子类).要解决此问题，您只需投射ListAdapter

notifyDataSetChanged is not a method of ListAdapter, but of BaseAdapter, (ArrayAdapter is a subclass of BaseAdapter). To fix you can simply cast the ListAdapter

theListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            String s1 = String.valueOf(parent.getItemAtPosition(position));
            pe.remove(s1);
             ((BaseAdapter)theAdapter).notifyDataSetChanged();