flutter snackbar
ScaffoldMessenger.of(context).showSnackBar(SnackBar(
content: Text("Your Text"),
duration: Duration(milliseconds: 300),
));
snackbar în flutter
final snackBar = SnackBar(content: Text('Yay! A SnackBar!'));
// Find the ScaffoldMessenger in the widget tree
// and use it to show a SnackBar.
ScaffoldMessenger.of(context).showSnackBar(snackBar);