HarmonyOS 鸿蒙Next cached_network_image三方库的使用接入案例

cached_network_image是纯dart库，可以直接使用 参考demo: pubspec.yaml:

name: flutter_dev11
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 is used as CFBundleVersion.
Read more about iOS versioning at
https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
In Windows, build-name is used as the major, minor, and patch parts
of the product and file versions while build-number is used as the build suffix.
version: 1.0.0+1
environment:
  sdk: '>=2.19.6 <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versions available, run flutter pub outdated.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
The following adds the Cupertino Icons font to your application.
Use with the CupertinoIcons class for iOS style icons.
  cupertino_icons: ^1.0.2
  baseflow_plugin_template: ^2.1.2
  flutter_blurhash: ^0.7.0
  cached_network_image: 3.2.3
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: ^2.0.0
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 packages.
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

import 'dart:io';

import 'package:baseflow_plugin_template/baseflow_plugin_template.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:flutter_blurhash/flutter_blurhash.dart';

void main() {
  CachedNetworkImage.logLevel = CacheManagerLogLevel.debug;
  runApp(
    BaseflowPluginExample(
      pluginName: 'CachedNetworkImage',
      githubURL: 'https://github.com/Baseflow/flutter_cached_network_image',
      pubDevURL: 'https://pub.dev/packages/cached_network_image',
      pages: [
        BasicContent.createPage(),
        ListContent.createPage(),
        GridContent.createPage(),
      ],
    ),
  );
}

/// Demonstrates a [StatelessWidget] containing [CachedNetworkImage]
class BasicContent extends StatelessWidget {
  const BasicContent({super.key});

  static ExamplePage createPage() {
    return ExamplePage(Icons.image, (context) => const BasicContent());
  }

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            _blurHashImage(),
            _sizedContainer(
              const Image(
                image: CachedNetworkImageProvider(
                  'https://via.placeholder.com/350x150',
                ),
              ),
            ),
            _sizedContainer(
              CachedNetworkImage(
                progressIndicatorBuilder: (context, url, progress) => Center(
                  child: CircularProgressIndicator(
                    value: progress.progress,
                  ),
                ),
                imageUrl:
                    'https://images.unsplash.com/photo-1532264523420-881a47db012d?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9',
              ),
            ),
            _sizedContainer(
              CachedNetworkImage(
                placeholder: (context, url) =>
                    const CircularProgressIndicator(),
                imageUrl: 'https://via.placeholder.com/200x150',
              ),
            ),
            _sizedContainer(
              CachedNetworkImage(
                imageUrl: 'https://via.placeholder.com/300x150',
                imageBuilder: (context, imageProvider) => Container(
                  decoration: BoxDecoration(
                    image: DecorationImage(
                      image: imageProvider,
                      fit: BoxFit.cover,
                      colorFilter: const ColorFilter.mode(
                        Colors.red,
                        BlendMode.colorBurn,
                      ),
                    ),
                  ),
                ),
                placeholder: (context, url) =>
                    const CircularProgressIndicator(),
                errorWidget: (context, url, error) => const Icon(Icons.error),
              ),
            ),
            CachedNetworkImage(
              imageUrl: 'https://via.placeholder.com/300x300',
              placeholder: (context, url) => const CircleAvatar(
                backgroundColor: Colors.amber,
                radius: 150,
              ),
              imageBuilder: (context, image) => CircleAvatar(
                backgroundImage: image,
                radius: 150,
              ),
            ),
            _sizedContainer(
              CachedNetworkImage(
                imageUrl: 'https://notAvalid.uri',
                placeholder: (context, url) =>
                    const CircularProgressIndicator(),
                errorWidget: (context, url, error) => const Icon(Icons.error),
              ),
            ),
            _sizedContainer(
              CachedNetworkImage(
                imageUrl: 'not a uri at all',
                placeholder: (context, url) =>
                    const CircularProgressIndicator(),
              ),
            ),
            _sizedContainer(
              CachedNetworkImage(
                maxHeightDiskCache: 10,
                imageUrl: 'https://via.placeholder.com/350x200',
                placeholder: (context, url) =>
                    const CircularProgressIndicator(),
                errorWidget: (context, url, error) => const Icon(Icons.error),
                fadeInDuration: const Duration(seconds: 3),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

Widget _blurHashImage() {
  return SizedBox(
    width: double.infinity,
    child: CachedNetworkImage(
      placeholder: (context, url) => const AspectRatio(
        aspectRatio: 1.6,
        child: BlurHash(hash: 'LEHV6nWB2yk8pyo0adR*.7kCMdnj'),
      ),
      imageUrl: 'https://blurha.sh/assets/images/img1.jpg',
      fit: BoxFit.cover,
    ),
  );
}

Widget _sizedContainer(Widget child) {
  return SizedBox(
    width: 300,
    height: 150,
    child: Center(child: child),
  );
}

/// Demonstrates a [ListView] containing [CachedNetworkImage]
class ListContent extends StatelessWidget {
  const ListContent({super.key});

  static ExamplePage createPage() {
    return ExamplePage(Icons.list, (context) => const ListContent());
  }

  @override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemBuilder: (BuildContext context, int index) => Card(
        child: Column(
          children: [
            CachedNetworkImage(
              imageUrl: 'https://loremflickr.com/320/240/music?lock=$index',
              placeholder: (BuildContext context, String url) => Container(
                width: 320,
                height: 240,
                color: Colors.purple,
              ),
            ),
          ],
        ),
      ),
      itemCount: 250,
    );
  }
}

/// Demonstrates a [GridView] containing [CachedNetworkImage]
class GridContent extends StatelessWidget {
  const GridContent({super.key});

  static ExamplePage createPage() {
    return ExamplePage(Icons.grid_on, (context) => const GridContent());
  }

  @override
  Widget build(BuildContext context) {
    return GridView.builder(
      itemCount: 250,
      gridDelegate:
          const SliverGridDelegateWithFixedCrossAxisCount(crossAxisCount: 3),
      itemBuilder: (BuildContext context, int index) => CachedNetworkImage(
        imageUrl: 'https://loremflickr.com/100/100/music?lock=$index',
        placeholder: _loader,
      ),
    );
  }

  Widget _loader(BuildContext context, String url) {
    return const Center(child: CircularProgressIndicator());
  }

  Widget _error(BuildContext context, String url, Object error) {
    return const Center(child: Icon(Icons.error));
  }
}