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must remove item from list using onDesmissed function
final items = List<String>.generate(20, (i) => "Item ${i + 1}");
@override
Widget build(BuildContext context) {
final title = 'Dismissing Items';
return MaterialApp(
title: title,
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: Text(title),
),
body: ListView.separated(
itemCount: items.length,
itemBuilder: (context, index) {
final item = items[index];
return Dismissible(
// Each Dismissible must contain a Key. Keys allow Flutter to
// uniquely identify widgets.
key: Key(item),
// Provide a function that tells the app
// what to do after an item has been swiped away.
onDismissed: (direction) {
// Remove the item from the data source.
setState(() {
items.removeAt(index);
});
// Then show a snackbar.
ScaffoldMessenger.of(context)
.showSnackBar(SnackBar(content: Text("$item dismissed")));
},
// Show a red background as the item is swiped away.
background: Container(color: Colors.red),
child: ListTile(title: Text('$item')),
);
},
separatorBuilder: (BuildContext context, int index) => Divider(),
),
),
);
}