Você pode acessar o pai ScaffoldState usando Scaffold.of(context)
Então faça algo como
Scaffold.of(context).showSnackBar(SnackBar(
content: Text("Sending Message"),
));
Para mais detalhes consulte:
https://material.io/design/components/snackbars.html#usage
Exemplo:
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
home: const Home(),
);
}
}
class Home extends StatelessWidget {
const Home({
Key key,
}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Snack bar'),
),
/// We use [Builder] here to use a [context] that is a descendant of [Scaffold]
/// or else [Scaffold.of] will return null
body: Builder(
builder: (context) => Center(
child: RaisedButton(
child: const Text('Show toast'),
onPressed: () => _showToast(context),
),
),
),
);
}
void _showToast(BuildContext context) {
final scaffold = Scaffold.of(context);
scaffold.showSnackBar(
SnackBar(
content: const Text('Added to favorite'),
action: SnackBarAction(
label: 'UNDO', onPressed: scaffold.hideCurrentSnackBar),
),
);
}
}
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