Flutter ListView delete and undo operation

Question

How can I implement a ListView that has a Dismissible widget, and when I swipe, I can delete the item, but how can I bring it back when tapping say

Answer 1

All you needed is

_list.insert(index, yourDeletedItem);

Here is the complete code with SnackBar added.

GlobalKey _key = GlobalKey(); // added
List _list = List.generate(10, (index) => "${index}");

@override
Widget build(BuildContext context) {
  return Scaffold(
    key: _key, // added
    appBar: AppBar(title: Text("App")),
    body: ListView.builder(
      itemCount: _list.length,
      itemBuilder: (context, index) {
        return Dismissible(
          key: Key(_list[index]),
          child: ListTile(title: Text(_list[index])),
          background: Container(color: Colors.red),
          onDismissed: (direction) {
            setState(() {
              // added this block 
              String deletedItem = _list.removeAt(index);
              _key.currentState
               ..removeCurrentSnackBar()
               ..showSnackBar(
                SnackBar(
                  content: Text("Deleted \"${deletedItem}\""),
                  action: SnackBarAction(
                    label: "UNDO",
                    onPressed: () => setState(() => _list.insert(index, deletedItem),) // this is what you needed
                  ),
                ),
              );
            });
          },
        );
      },
    ),
  );
}

Screenshot