您可以只使用StatefulWidget，然后长按ListTile并使用setState重建小部件.

You can just use a StatefulWidget and after you long press the ListTile rebuild the widget using setState.

检查此样本:

    class MyApp extends StatefulWidget {
      @override
      MyAppState createState() => MyAppState();
    }

    class MyAppState extends State<MyApp> {
      bool isVisible = false;

      @override
      Widget build(BuildContext context) {
        return Scaffold(
            body: Center(
                child: ListTile(
          title: Text("Title"),
          onLongPress: () {
            setState(() {
              isVisible = !isVisible;
            });
          },
          subtitle: isVisible ? Text("Subtitle sample") : null,
        )));
      }
    }