main.dart

  void main() => runApp(DemoApp());

  class DemoApp extends StatelessWidget {
    const DemoApp();

    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        home: Scaffold(
          appBar: AppBar(
            title: const Text("Swipe to delete"),
          ),
          body: const Center(
            child: SwipeItems(),
          )
        ),
      );
    }
  }
  

swipelist_provider.dart

  class SourceList with ChangeNotifier {
    final _myList = List<String>.generate(10, (i) {
      return "Number $i";
    });

    List<String> get values => UnmodifiableListView(_myList);

    void removeItem(int index) {
      _myList.removeAt(index);
      notifyListeners();
    }
  }
  

swipe_items.dart

  class SwipeItems extends StatelessWidget {
    const SwipeItems();

    @override
    Widget build(BuildContext context) {
      return Consumer<SourceList>(
        builder: (context, list, _) {
          return ListView.builder(
            itemCount: list.values.length,
            itemBuilder: (context, index) {
              var item = list.values[index];

              return Dismissible(
                key: Key(item),
                background: Container(
                  color: Colors.redAccent,
                ),
                onDismissed: (direction) {
                  list.removeItem(index);
                },
                direction: DismissDirection.startToEnd,
                confirmDismiss: (direction) => _getConfirm(context, direction),
                child: ListTile(
                  leading: const Icon(Icons.trending_flat),
                  title: Text(item),
                ),
              );
            },
          );
        },
      );
    }

    Future<bool> _getConfirm(BuildContext context, DismissDirection direction) {
      return showDialog<bool>(
        context: context,
        barrierDismissible: false, // user must tap button!
        builder: (BuildContext context) {
          return AlertDialog(
            title: const Text("Confirm"),
            content: const Text("Do you really want to delete this item?"),
            actions: <Widget>[
              RaisedButton(
                child: Text("Nope"),
                color: Colors.blueAccent,
                onPressed: () {
                  Navigator.of(context)?.pop(false);
                },
              ),
              FlatButton(
                child: Text("Yes"),
                onPressed: () {
                  Navigator.of(context)?.pop(true);
                },
              ),
            ],
          );
        },
      );
    }

  }
  

swipelist_provider.dart

  class DismissBackground extends StatelessWidget {
    const DismissBackground();

    @override
    Widget build(BuildContext context) {
      return Container(
        color: Colors.redAccent,
      );
    }
  }