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README.md
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README.md
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# 凡泰极客 Flutter 小程序 Demo
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# 深入小程序系列之二、Flutter 和小程序混编
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## 背景
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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。
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先看一下效果如下:
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## 新建 Flutter 样例工程
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### Flutter 的安装
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Flutter 的安装可参考[https://flutterchina.club/get-started/install/](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。
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1. 下载 FlutterSDK
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2. 配置 PATH 环境路径
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3. flutter doctor 检查环境
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### 新建 Flutter 工程
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```bash
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flutter create --template=app --org=com.finogeeks.flutter --project-name=mini_flutter -i objc -a java ./mini_flutter
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```
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执行以上命令后，正常将会提示以下信息
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```bash
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All done!
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[✓] Flutter: is fully installed. (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.15.3 19D76, locale zh-Hans-CN)
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[✓] Android toolchain - develop for Android devices: is fully installed. (Android SDK version 29.0.3)
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[✓] Xcode - develop for iOS and macOS: is fully installed. (Xcode 11.3.1)
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[✓] Android Studio: is fully installed. (version 3.6)
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[!] IntelliJ IDEA Ultimate Edition: is partially installed; more components are available. (version 2019.3.3)
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[✓] VS Code: is fully installed. (version 1.42.1)
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[!] Proxy Configuration: is partially installed; more components are available.
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[✓] Connected device: is fully installed. (1 available)
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Run "flutter doctor" for information about installing additional components.
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In order to run your application, type:
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$ cd mini_flutter
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$ flutter run
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Your application code is in mini_flutter/lib/main.dart.
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```
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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。
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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。
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1. [✓] Xcode - develop for iOS and macOS: is fully installed. (Xcode 11.3.1)
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2. Flutter: is fully installed. (Channel stable, v1.12.13+hotfix.8, on Mac OS X 10.15.3 19D76, locale zh-Hans-CN)
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3. VS Code: is fully installed. (version 1.42.1)
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[!] Proxy Configuration: is partially installed; more components are available.
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### 集成小程序解析引擎
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这里我们采用凡泰集成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。
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1. 引入小程序引擎插件。在 pubspec.yaml 文件中引入小程序 Flutter 插件
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```yaml
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mop: ^0.2.0
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```
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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](https://mp.finogeeks.com)免费注册获取。注册使用方法可以参考[接入指引](https://mp.finogeeks.com/mop/document/introduce/access/mechanism.html)
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```dart
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// Platform messages are asynchronous, so we initialize in an async method.
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Future<void> init() async {
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if (Platform.isIOS) {
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final res = await Mop.instance.initialize(
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'22LyZEib0gLTQdU3MUauAYEY1h9s9YXzmGuSgQrin7UA', '9e05fa0015d7dbfa',
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apiServer: 'https://mp.finogeeks.com', apiPrefix: '/api/v1/mop');
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print(res);
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} else if (Platform.isAndroid) {
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final res = await Mop.instance.initialize(
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'22LyZEib0gLTQdU3MUauAYEY1h9s9YXzmGuSgQrin7UA', '9e05fa0015d7dbfa',
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apiServer: 'https://mp.finogeeks.com', apiPrefix: '/api/v1/mop');
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print(res);
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}
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if (!mounted) return;
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}
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```
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3. 在主界面上增加三个按钮来打开小程序
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```dart
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Center(
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child: Container(
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padding: EdgeInsets.only(
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top: 20,
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),
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child: Column(
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children: <Widget>[
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Container(
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width: 140,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.all(Radius.circular(5)),
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gradient: LinearGradient(
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colors: const [Color(0xFF12767e), Color(0xFF0dabb8)],
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stops: const [0.0, 1.0],
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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),
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),
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child: FlatButton(
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onPressed: () {
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Mop.instance.openApplet('5e3c147a188211000141e9b1',
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path: 'pages/index/index', query: '');
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},
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child: Text(
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'打开画图小程序',
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style: TextStyle(color: Colors.white),
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),
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),
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),
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SizedBox(height: 30),
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Container(
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width: 140,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.all(Radius.circular(5)),
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gradient: LinearGradient(
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colors: const [Color(0xFF12767e), Color(0xFF0dabb8)],
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stops: const [0.0, 1.0],
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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),
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),
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child: FlatButton(
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onPressed: () {
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Mop.instance.openApplet('5e4d123647edd60001055df1');
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},
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child: Text(
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'打开官方小程序',
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style: TextStyle(color: Colors.white),
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),
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),
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),
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SizedBox(height: 30),
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Container(
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width: 140,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.all(Radius.circular(5)),
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gradient: LinearGradient(
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colors: const [Color(0xFF12767e), Color(0xFF0dabb8)],
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stops: const [0.0, 1.0],
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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),
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),
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child: FlatButton(
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onPressed: () {
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Mop.instance.openApplet('5e637a18cbfae4000170fa7a');
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},
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child: Text(
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'我的对账单',
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style: TextStyle(color: Colors.white),
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),
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),
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),
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],
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),
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),
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)
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```
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4. 运行 Flutter 程序
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- 在代码根目录执行 flutter devices 查看本机安装的模拟器。
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- 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。
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