Flutter 使用包资源

• 访问包仓库 https://pub.dev/
• 搜索到你想要的包，以provider为例子

1. Depend on it
   Add this to your package's pubspec.yaml file:

dependencies:
  provider: ^4.3.1

2. Install it
   You can install packages from the command line:

with Flutter:

$ flutter pub get

Alternatively, your editor might support flutter pub get. Check the docs for your editor to learn more.

3. Import it
   Now in your Dart code, you can use:

import 'package:provider/provider.dart';