Dismissing a Dismissible with Flutter/Dart

Question

In the majority of the Dismissible examples provided by Flutter, they are dismissing items within a ListView. For example, this.

What I am currently doing is this:

Answer 1

simplest way 1-> set unique id for each item of list with

var uuid = new Uuid();

  new MyItem(title: "Sanjay Singh Bisht",color:"#123ab",uniqueId:uuid.v1()));

as mentioned in above post Dismissible widget required unique id

2-> now to delete item its simple

if (items.contains(deletedItem)) {
    setState(() {
      items.remove(deletedItem);
    });
  }

3- to undo delete item just update that item id so that Dismissible widget has unique id always

setState(() {
deletedItem.uniqueId=uuid.v1();
});