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6-3章节: 如何使用 flutter 包和插件--代码执行报错

plugin_use.dart 源代码:

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

///如何使用Flutter包和插件？
class PluginUse extends StatefulWidget {
  const PluginUse({Key? key}) : super(key: key);

  @override
  _PluginUseState createState() => _PluginUseState();
}

class _PluginUseState extends State<PluginUse> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('如何使用Flutter包和插件？'),
        leading: GestureDetector(
          onTap: () {
            Navigator.pop(context);
          },
          child: const Icon(Icons.arrow_back),
        ),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
              style: TextStyle(color: ColorUtil.color('#a9ee00')),
            ),
          ],
        ),
      ),
    );
  }
}


// class PluginUse extends StatelessWidget {
//   const PluginUse({Key? key}) : super(key: key);
//
//   // This widget is the root of your application.
//   @override
//   Widget build(BuildContext context) {
//     return MaterialApp(
//       title: '如何使用 Flutter 插件',
//       theme: ThemeData(
//         primarySwatch: Colors.blue,
//       ),
//       home: const MyHomePage(title: '如何使用 Flutter 插件'),
//     );
//   }
// }
//
// class MyHomePage extends StatefulWidget {
//   const MyHomePage({Key? key, required this.title}) : super(key: key);
//   final String title;
//
//   @override
//   State<MyHomePage> createState() => _MyHomePageState();
// }
//
// class _MyHomePageState extends State<MyHomePage> {
//   int _counter = 0;
//
//   void _incrementCounter() {
//     setState(() {
//       _counter++;
//     });
//   }
//
//   @override
//   Widget build(BuildContext context) {
//     return Scaffold(
//       appBar: AppBar(
//         title: Text(widget.title),
//       ),
//       body: Center(
//         child: Column(
//           mainAxisAlignment: MainAxisAlignment.center,
//           children: <Widget>[
//             const Text(
//               'You have pushed the button this many times-1:',
//               // ColorUtil.color('#a1FF5733')
//
//               // style: TextStyle(color: ColorUtil.color('#899900')),
//               style: TextStyle(color: ColorUtil.color('#a9ee00')),
//             ),
//             Text(
//               '$_counter',
//               style: Theme.of(context).textTheme.headline4,
//             ),
//           ],
//         ),
//       ),
//       floatingActionButton: FloatingActionButton(
//         onPressed: _incrementCounter,
//         tooltip: 'Increment',
//         child: const Icon(Icons.add),
//       ), // This trailing comma makes auto-formatting nicer for build methods.
//     );
//   }
// }

plugin_use.dart 源代码:

import 'package:flutter/material.dart';
import 'package:flutter_basics_mu_01/plugin_use.dart';

// void main() {
//   // runApp(const MyApp());
//   runApp(PluginUse());
// }
void main() => runApp(PluginUse());


class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'You have pushed the button this many times-1:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headline4,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: const Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

pubspec.yaml 源文件代码:

name: flutter_basics_mu_01
description: A new Flutter project.

# The following line prevents the package from being accidentally published to
# pub.dev using `flutter pub publish`. This is preferred for private packages.
publish_to: 'none' # Remove this line if you wish to publish to pub.dev

# The following defines the version and build number for your application.
# A version number is three numbers separated by dots, like 1.2.43
# followed by an optional build number separated by a +.
# Both the version and the builder number may be overridden in flutter
# build by specifying --build-name and --build-number, respectively.
# In Android, build-name is used as versionName while build-number used as versionCode.
# Read more about Android versioning at https://developer.android.com/studio/publish/versioning
# In iOS, build-name is used as CFBundleShortVersionString while build-number used as CFBundleVersion.
# Read more about iOS versioning at
# https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
version: 1.0.0+1

environment:
  sdk: ">=2.15.0 <3.0.0"

# Dependencies specify other packages that your package needs in order to work.
# To automatically upgrade your package dependencies to the latest versions
# consider running `flutter pub upgrade --major-versions`. Alternatively,
# dependencies can be manually updated by changing the version numbers below to
# the latest version available on pub.dev. To see which dependencies have newer
# versions available, run `flutter pub outdated`.
dependencies:
  flutter:
    sdk: flutter
  flutter_color_plugin: ^1.1.0



  # The following adds the Cupertino Icons font to your application.
  # Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2

dev_dependencies:
  flutter_test:
    sdk: flutter

  # The "flutter_lints" package below contains a set of recommended lints to
  # encourage good coding practices. The lint set provided by the package is
  # activated in the `analysis_options.yaml` file located at the root of your
  # package. See that file for information about deactivating specific lint
  # rules and activating additional ones.
  flutter_lints: ^1.0.0

# For information on the generic Dart part of this file, see the
# following page: https://dart.dev/tools/pub/pubspec

# The following section is specific to Flutter.
flutter:

  # The following line ensures that the Material Icons font is
  # included with your application, so that you can use the icons in
  # the material Icons class.
  uses-material-design: true

  # To add assets to your application, add an assets section, like this:
  # assets:
  #   - images/a_dot_burr.jpeg
  #   - images/a_dot_ham.jpeg

  # An image asset can refer to one or more resolution-specific "variants", see
  # https://flutter.dev/assets-and-images/#resolution-aware.

  # For details regarding adding assets from package dependencies, see
  # https://flutter.dev/assets-and-images/#from-packages

  # To add custom fonts to your application, add a fonts section here,
  # in this "flutter" section. Each entry in this list should have a
  # "family" key with the font family name, and a "fonts" key with a
  # list giving the asset and other descriptors for the font. For
  # example:
  # fonts:
  #   - family: Schyler
  #     fonts:
  #       - asset: fonts/Schyler-Regular.ttf
  #       - asset: fonts/Schyler-Italic.ttf
  #         style: italic
  #   - family: Trajan Pro
  #     fonts:
  #       - asset: fonts/TrajanPro.ttf
  #       - asset: fonts/TrajanPro_Bold.ttf
  #         weight: 700
  #
  # For details regarding fonts from package dependencies,
  # see https://flutter.dev/custom-fonts/#from-packages