Hello Flutter！

import ‘package:flutter/material.dart‘;

void main() => runApp(new HelloWorldApp());

class HelloWorldApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: "Hello World",
      home: Scaffold(
        appBar: AppBar(
          title: Text("Hello World Travel App"),
          backgroundColor: Colors.deepPurple,
        ),
        body: Builder(
          builder: (context) => SingleChildScrollView(
            child: Padding(
              padding: EdgeInsets.all(20),
              child: Center(
                  child: Column(
                children: [
                  Padding(
                    padding: EdgeInsets.all(10),
                    child: Text(
                      ‘Hello World Travel‘,
                      style: TextStyle(
                          fontSize: 26,
                          fontWeight: FontWeight.bold,
                          color: Colors.blue[800]),
                    ),
                  ),
                  Padding(
                    padding: EdgeInsets.all(5),
                    child: Text(
                      ‘Discover the World‘,
                      style: TextStyle(
                        fontSize: 20,
                        color: Colors.deepPurpleAccent,
                      ),
                    ),
                  ),
                  Padding(
                    padding: EdgeInsets.all(25),
                    child: Container(
                        decoration: BoxDecoration(boxShadow: [
                          BoxShadow(
                              color: Colors.blue,
                              blurRadius: 10,
                              spreadRadius: 2)
                        ]),
                        child: Image.network(
                          ‘https://images.freeimages.com/images/large-previews/eaa/the-beach-1464354.jpg‘,
                          height: 350,
                        )),
                  ),
                  Padding(
                    padding: EdgeInsets.all(25),
                    child: RaisedButton(
                        child: Text(‘Contacts‘),
                        onPressed: () => print(‘Contact us‘)),
                  ),
                ],
              )),
            ),
          ),
        ),
      ),
    );
  }

  void contactUs(BuildContext context) {
    showDialog(
        context: context,
        builder: (BuildContext context) {
          return AlertDialog(
            title: Text(‘Contact me‘),
            content: Text(‘Mail us at hello@world.com‘),
            actions: <Widget>[
              FlatButton(
                child: Text(‘Close‘),
                onPressed: () => Navigator.of(context).pop(),
              )
            ],
          );
        });
  }
}