ScaffoldMessenger.of(context).showSnackBar(SnackBar( content: Text("Your Text"), duration: Duration(milliseconds: 300), ));
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);