Flutter 案例学习之：Snackbar

GitHub：https://github.com/happy-python/flutter_demos/tree/master/snackbar_demo

Snackbar

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: "Flutter Tutorial",
      theme: new ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: HomePage(title: "SnackBar"),
    );
  }
}

class HomePage extends StatelessWidget {
  final String title;

  HomePage({this.title});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(
          title,
          style: TextStyle(fontSize: 15.0),
        ),
      ),
      body: MySnackBar(),
    );
  }
}

class MySnackBar extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Container(
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            RaisedButton(
              onPressed: () {
                Scaffold.of(context).showSnackBar(
                  SnackBar(
                    content: Text("Hello From SnackBar"),
                    duration: Duration(seconds: 3),
                  ),
                );
              },
              color: Colors.amber,
              child: Text("Click Me"),
            )
          ],
        ),
      ),
    );
  }
}