showMessage method
Implementation
void showMessage(String content, ScaffoldState scaffoldState) {
// final snackBar = SnackBar(
// content: Text(content),
// action: SnackBarAction(
// label: 'Undo',
// onPressed: () {
// // Some code to undo the change.
// },
// ),
// );
// Find the Scaffold in the widget tree and use
// it to show a SnackBar.
// scaffoldState.showSnackBar(snackBar);
}