DART

flutter snackbar duration

ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(
            duration: const Duration(milliseconds: 4000), // default 4s
            content: const Text('Awesome Snackbar!'),
          ),
        );

flutter snackbar position

SnackBar(
  behavior: SnackBarBehavior.floating,
  margin: EdgeInsets.only(bottom: 100.0),
  content: Text("Hello World!"),
);

snackbar in 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);

snackbar in flutter

final snackBar = SnackBar(
  content: Text('Yay! A SnackBar!'),
  action: SnackBarAction(
    label: 'Undo',
    onPressed: () {
      // Some code to undo the change.
    },
  ),
);