Showsnackbar in flutter

I don’t want to call show SnackBar on every single Page. Is there any way to call snack bar globally only once? I used this But it shows context error.

ScaffoldMessenger.of(context).showSnackBar(snackBar);

>Solution :

You must write this method in a separate file. Call it where you need it, and it is necessary to pass the current class context.

showAlert(BuildContext context) {
 ScaffoldMessenger.of(context).showSnackBar(
     const SnackBar(
      content: Text("Type Your message here..."),
    ),
  );
}