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。

  1. 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。

本文示例代码: https://github.com/finogeeks/mop-flutter-demo

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