Key points:

• Use a Dismissible widget to allow an item in a list to be deleted.
• Each Dismissable must have a unique key.
• You can use a SnackBar to give feedback to your users.

Solution:

In the itemBuilder of the ListView.builder, in the build() method of the _ItemsScreenState class in the items_screen.dart file, add a Dismissible widget, as follows:

 itemBuilder: (BuildContext context, int index) {
          return Dismissible(
              key: Key(items[index].name),
              onDismissed: (direction) {
                String strName = items[index].name;
                helper.deleteItem(items[index]);
                setState(() {
                  items.removeAt(index);
                });
                Scaffold.of(context)
                    .showSnackBar(SnackBar(content: Text("$strName
                     deleted")));
              },
              child: ListTile(

The app is now complete. There's only one more step to perform: making sure that it works as expected.