Show Snackbar by clicking on a button

main.dart

import 'package:flutter/material.dart';
import 'package:fluttertoast/fluttertoast.dart';

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter layout demo',
      home: new Scaffold(
        appBar: AppBar(
          title: Text('Flutter layout demo'),
        ),
        body: new Body(),
    ));
  }
}

class Body extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

    return Center(
      child: RaisedButton(
          child: Text('Hello World'),
          onPressed:() {
            Scaffold.of(context).showSnackBar(new SnackBar(
              content: new Text("Wait a second ..."),
            ));
          }),
    );
    return null;
  }


}