1_MaterialPageRoute

---

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: 'Navigation Basics',
    home: FirstScreen(),
  ));
}

class FirstScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('First Screen'),
      ),
      body: Center(
        child: RaisedButton(
          child: Text('Launch screen'),
          onPressed: () {
            Navigator.push(
              context,
              MaterialPageRoute(builder: (context) => SecondScreen()),
            );
          },
        ),
      ),
    );
  }
}

class SecondScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("Second Screen"),
      ),
      body: Center(
        child: RaisedButton(
          onPressed: () {
            Navigator.pop(context);
          },
          child: Text('Go back!'),
        ),
      ),
    );
  }
}
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2_Image(图片)

---

详细步骤查看第10个视频

2.1_本地图片

新建一个包并把本地图片添加在包中

pubspec.yaml

assets:
- lib/images/

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    var title = 'Web Images';

    return MaterialApp(
      title: title,
      home: Scaffold(
        appBar: AppBar(
          title: Text(title),
        ),
        body: Image.asset('lib/images/flutter.png'),
      ),
    );
  }
}
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3_AlertDialog(警告对话框)

---

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: MyHome(),
  ));
}

class MyHome extends StatefulWidget {
  @override
  MyHomeState createState() => MyHomeState();
}

class MyHomeState extends State<MyHome> {
  // Generate dialog
  AlertDialog dialog = AlertDialog(
      content: Text(
        "Hello World!",
        style: TextStyle(fontSize: 30.0),
      ));

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("Using Alert Dialog"),
        ),
        body: Container(
          child: Center(
            child: RaisedButton(
                child: Text("Hit to alert!"),
                // On press of the button
                onPressed: () {
                  // Show dialog
                  showDialog(context: context, builder: (BuildContext context) => dialog);
                }),
          ),
        ));
  }
}
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