Flutter 资源管理插件 flutter_gallery_assets 的使用

简介

flutter_gallery_assets 是一个用于管理和加载 Flutter Gallery 应用中的图像、字体和视频资源的插件。这些资源通常用于展示 Flutter 的各种功能和组件。你可以从 flutter.dev 获取更多关于 Flutter 的信息。

视频来源

flutter_gallery_assets 插件中包含的视频遵循 CC0 1.0 Universal 许可证，来源如下：

• 蝴蝶、花朵、昆虫、自然
• 蜜蜂、昆虫、花朵、飞行

安装

在 pubspec.yaml 文件中添加 flutter_gallery_assets 依赖：

dependencies:
  flutter:
    sdk: flutter
  flutter_gallery_assets: ^0.1.0

然后运行 flutter pub get 来安装依赖。

使用示例

加载图像

以下是一个示例，展示了如何使用 flutter_gallery_assets 加载并显示图像：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Gallery Assets Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: ImagePage(),
    );
  }
}

class ImagePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Image Page'),
      ),
      body: Center(
        child: Image.asset(
          FlutterGalleryAssets.butterflyFlowerInsectNature,
          width: 300,
          height: 300,
        ),
      ),
    );
  }
}

加载视频

以下是一个示例，展示了如何使用 flutter_gallery_assets 加载并播放视频：

import 'package:flutter/material.dart';
import 'package:video_player/video_player.dart';
import 'package:flutter_gallery_assets/flutter_gallery_assets.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Gallery Assets Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: VideoPage(),
    );
  }
}

class VideoPage extends StatefulWidget {
  @override
  _VideoPageState createState() => _VideoPageState();
}

class _VideoPageState extends State<VideoPage> {
  late VideoPlayerController _controller;

  @override
  void initState() {
    super.initState();
    _controller = VideoPlayerController.asset(FlutterGalleryAssets.butterflyFlowerInsectNatureVideo)
      ..initialize().then((_) {
        // Ensure the first frame is shown after the video is initialized, even before the play button has been pressed.
        setState(() {});
      });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Video Page'),
      ),
      body: Center(
        child: _controller.value.isInitialized
            ? AspectRatio(
                aspectRatio: _controller.value.aspectRatio,
                child: VideoPlayer(_controller),
              )
            : Container(),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: () {
          setState(() {
            if (_controller.value.isPlaying) {
              _controller.pause();
            } else {
              _controller.play();
            }
          });
        },
        child: Icon(
          _controller.value.isPlaying ? Icons.pause : Icons.play_arrow,
        ),
      ),
    );
  }

  @override
  void dispose() {
    super.dispose();
    _controller.dispose();
  }
}

加载字体

以下是一个示例，展示了如何使用 flutter_gallery_assets 加载并应用自定义字体：

首先，在 pubspec.yaml 中声明字体资源：

flutter:
  fonts:
    - family: CustomFont
      fonts:
        - asset: packages/flutter_gallery_assets/fonts/CustomFont.ttf

然后在 Dart 代码中使用该字体：

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Gallery Assets Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        textTheme: TextTheme(
          bodyText2: TextStyle(
            fontFamily: 'CustomFont',
          ),
        ),
      ),
      home: FontPage(),
    );
  }
}

class FontPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Font Page'),
      ),
      body: Center(
        child: Text(
          'Hello, World!',
          style: TextStyle(fontSize: 24),
        ),
      ),
    );
  }
}

通过以上示例，你可以看到如何使用 flutter_gallery_assets 插件来加载和使用图像、视频和字体资源。希望这些示例对你有所帮助！