您应该记录在其他List或Map中选择的item，以便在该列表中添加或删除项目时可以相应地更新UI。

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({super.key});

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  final list = ['Candice Cook', 'David Campbell Cook', 'Marcia Chan'];
  final List<String> _selectedList = [];

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      body: ListView.builder(
          itemCount: list.length,
          itemBuilder: (_, index) {
            var e = list[index];
            return ListTile(
              selectedTileColor: Colors.purple,
              title: Text(e),
              selected: _selectedList.contains(e),
              onTap: () {
                setState(() {
                  _selectedList.contains(e)
                      ? _selectedList.remove(e)
                      : _selectedList.add(e);
                });
              },
            );
          }),
    );
  }
}