深入小程序系列之二、Flutter 和小程序混编
背景
本文我们将开一下脑洞,在 Flutter 工程基础上下集成及运行小程序方案。
先看一下效果如下:

新建 Flutter 样例工程
Flutter 的安装
Flutter 的安装可参考https://flutterchina.club/get-started/install/具体上主要执行以下三步即可。本文将使用 Flutter1.12.hotfix8 稳定版作为开发环境。
- 下载 FlutterSDK 
- 配置 PATH 环境路径 
- flutter doctor 检查环境 
新建 Flutter 工程
flutter create --template=app --org=com.finogeeks.flutter --project-name=mini_flutter -i objc -a java ./mini_flutte
执行以上命令后,正常将会提示以下信息
All done! [✓] Flutter: is fully installed. (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.15.3 19D76, locale zh-Hans-CN) [✓] Android toolchain - develop for Android devices: is fully installed. (Android SDK version 29.0.3) [✓] Xcode - develop for iOS and macOS: is fully installed. (Xcode 11.3.1) [✓] Android Studio: is fully installed. (version 3.6) [!] IntelliJ IDEA Ultimate Edition: is partially installed; more components are available. (version 2019.3.3) [✓] VS Code: is fully installed. (version 1.42.1) [!] Proxy Configuration: is partially installed; more components are available. [✓] Connected device: is fully installed. (1 available) Run "flutter doctor" for information about installing additional components. In order to run your application, type: $ cd mini_flutte $ flutter run Your application code is in mini_flutter/lib/main.dart.
注意!flutter 需要依赖本地安装对应的 iOS,Android 开发工具,即需要安装 Xcode 和 AndroidStudio。具体安装使用方法这里不赘述。
这里我们用 VSCode+Xcode 作为开发组合环境,如果要正常调试需要确保以下三个检查项目是正常的。
[✓] Xcode - develop for iOS and macOS: is fully installed. (Xcode 11.3.1)
Flutter: is fully installed. (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.15.3 19D76, locale zh-Hans-CN)
VS Code: is fully installed. (version 1.42.1)
[!] Proxy Configuration: is partially installed; more components are available.
集成小程序解析引擎
这里我们采用凡泰免费社区版的小程序解析引擎,只需要 10 行代码量不到即可完成小程序集成。
- 引入小程序引擎插件。在 pubspec.yaml 文件中引入小程序 Flutter 插件 
mop: ^0.2.0
2.在 main.dart 文件中增加以下小程序引擎初始化方法。Mop.instance.initialize这里需要用到 sdkkey 和 secret。可以直接在https://mp.finogeeks.com免费注册获取。注册使用方法可以参考接入指引
  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> init() async {
    if (Platform.isIOS) {
      final res = await Mop.instance.initialize(
          '22LyZEib0gLTQdU3MUauAYEY1h9s9YXzmGuSgQrin7UA', '9e05fa0015d7dbfa',
          apiServer: 'https://mp.finogeeks.com', apiPrefix: '/api/v1/mop');
      print(res);
    } else if (Platform.isAndroid) {
      final res = await Mop.instance.initialize(
          '22LyZEib0gLTQdU3MUauAYEY1h9s9YXzmGuSgQrin7UA', '9e05fa0015d7dbfa',
          apiServer: 'https://mp.finogeeks.com', apiPrefix: '/api/v1/mop');
      print(res);
    }
    if (!mounted) return;
  }3、在主界面上增加三个按钮来打开小程序
 Center(
    child: Container(
      padding: EdgeInsets.only(
        top: 20,
      ),
      child: Column(
        children: <Widget>[
          Container(
            width: 140,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.all(Radius.circular(5)),
              gradient: LinearGradient(
                colors: const [Color(0xFF12767e), Color(0xFF0dabb8)],
                stops: const [0.0, 1.0],
                begin: Alignment.topCenter,
                end: Alignment.bottomCenter,
              ),
            ),
            child: FlatButton(
              onPressed: () {
                Mop.instance.openApplet('5e3c147a188211000141e9b1',
                    path: 'pages/index/index', query: '');
              },
              child: Text(
                '打开画图小程序',
                style: TextStyle(color: Colors.white),
              ),
            ),
          ),
          SizedBox(height: 30),
          Container(
            width: 140,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.all(Radius.circular(5)),
              gradient: LinearGradient(
                colors: const [Color(0xFF12767e), Color(0xFF0dabb8)],
                stops: const [0.0, 1.0],
                begin: Alignment.topCenter,
                end: Alignment.bottomCenter,
              ),
            ),
            child: FlatButton(
              onPressed: () {
                Mop.instance.openApplet('5e4d123647edd60001055df1');
              },
              child: Text(
                '打开官方小程序',
                style: TextStyle(color: Colors.white),
              ),
            ),
          ),
          SizedBox(height: 30),
          Container(
            width: 140,
            decoration: BoxDecoration(
              borderRadius: BorderRadius.all(Radius.circular(5)),
              gradient: LinearGradient(
                colors: const [Color(0xFF12767e), Color(0xFF0dabb8)],
                stops: const [0.0, 1.0],
                begin: Alignment.topCenter,
                end: Alignment.bottomCenter,
              ),
            ),
            child: FlatButton(
              onPressed: () {
                Mop.instance.openApplet('5e637a18cbfae4000170fa7a');
              },
              child: Text(
                '我的对账单',
                style: TextStyle(color: Colors.white),
              ),
            ),
          ),
        ],
      ),
    ),
  )4、运行 Flutter 程序
- 在代码根目录执行 flutter devices 查看本机安装的模拟器。 
- 执行 flutter run --debug 运行示例,运行效果之如本文最前面所展示的图示。 
文章来源:凡泰极客
文档中心: Document
本文示例代码: https://github.com/finogeeks/mop-flutter-demo
相关文章:深入小程序系列之一:小程序核心原理及模拟
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