这个插件没有任何问题，我只是用你的HTML创建了一个示例，它工作得很好。尝试用下面的代码片段替换，看看是否工作。

dependencies:
  flutter_html: ^0.8.2

并导入和编码以呈现html
第一次

我刚刚完成了以下操作，它工作正常。

1.将flutter_html添加到pubspec.yaml文件中。

dependencies:
  flutter:
    sdk: flutter
  flutter_html: ^0.8.2

1.运行以下命令以更新软件包。
flutter pub get
1.导入flutter_html
import 'package:flutter_html/flutter_html.dart';
1.将文本小部件替换为Html小部件。

child: 
   // Text(
   //   "Hello Programmer",
   //   style: TextStyle(fontSize: 18),
   // ),
   Html(data:"<p>Hello <b>Flutter</b><p>"),

请勿使用flutter_html_view，即documentation处的阅读：

支持的标记

• p值
• 电磁
• B
• 图片
• 视频
• H1，
• H2，
• H3，
• H4，
• H5，
• h6基因
• 备注
• 此插件将一些html标签转换为flutter部件此插件不支持渲染完整的html代码（flutter中没有内置的Web渲染支持）*

所以它不能很好地呈现html，因为它不能。
但是你可以找到其他的pulugins，比如flutter_html
https://github.com/Sub6Resources/flutter_html
并给予他们尝试一下，看看他们是否表现得更好。

更新

在pubspec.yaml中，我添加了

dependencies:
  flutter_html: ^0.8.2

我的main.dart是

import 'package:flutter/material.dart';
import 'package:flutter_html/flutter_html.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  _MyHomePageState createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;
  var html = "Follow<a class='sup'>pl</a> what was sent down to you from your Lord, and do not follow other guardians apart from Him. Little do <p class='h'>you remind yourselves</p><a class='f'><sup f=2437>1</a>.";

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    // This method is rerun every time setState is called, for instance as done
    // by the _incrementCounter method above.
    //
    // The Flutter framework has been optimized to make rerunning build methods
    // fast, so that you can just rebuild anything that needs updating rather
    // than having to individually change instances of widgets.
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      body: Center(
        // Center is a layout widget. It takes a single child and positions it
        // in the middle of the parent.
        child: Column(
          // Column is also layout widget. It takes a list of children and
          // arranges them vertically. By default, it sizes itself to fit its
          // children horizontally, and tries to be as tall as its parent.
          //
          // Invoke "debug painting" (press "p" in the console, choose the
          // "Toggle Debug Paint" action from the Flutter Inspector in Android
          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
          // to see the wireframe for each widget.
          //
          // Column has various properties to control how it sizes itself and
          // how it positions its children. Here we use mainAxisAlignment to
          // center the children vertically; the main axis here is the vertical
          // axis because Columns are vertical (the cross axis would be
          // horizontal).
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Html(
              data: html,
              ),
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

将以下内容添加到pubspec.yaml文件中：

dependencies:
  flutter_html:

当前支持的HTML标记：

• a，缩写，首字母缩略词，地址，文章，旁白，b，bdi，bdo，大，块引用，正文，br，标题，引用，代码，数据，dd，del，dfn，div，dl，dt，em，插图标题，插图，页脚，h1，h2，h3，h4，h5，h6，页眉，hr，i，img，ins，kbd，li，main，mark，nav，noscript，ol，p，pre，q，rp，rt，ruby，s，samp，部分，小，跨度，走向，强，子，超级，表，tbody，td，模板，tfoot，th，head，时间，tr，tt，u，ul，var*
  示例用法：

Column(
   mainAxisAlignment: MainAxisAlignment.start,
   crossAxisAlignment: CrossAxisAlignment.start,
   children: [
      new Html(
         data: "<b>Welcome</b>,
          defaultTextStyle: TextStyle(fontSize: 15),
       ),
     ],
)

使用flutter_webview_plugin插件
例如：

new WebviewScaffold(
              url: new Uri.dataFromString('<html><body>hello world</body></html>', mimeType: 'text/html').toString()

自定义矩形内Web视图

final flutterWebviewPlugin = new FlutterWebviewPlugin();

flutterWebviewPlugin.launch(url,
  fullScreen: false,
  rect: new Rect.fromLTWH(
    0.0,
    0.0,
    MediaQuery.of(context).size.width,
    300.0,
  ),
);

在pubspec.yml中添加以下内容：

dependencies:
  flutter_html:

然后运行：

flutter clean && flutter pub get

最后，添加如下代码：

import 'package:flutter_html/flutter_html.dart';
.
.
.
body: Center( Html(
      data: """
            <div>This is the start of a div
              <a class='sup'><sup>a sup</sup></a> 
              and after sub
              <b>Bold</b>
              <h1>This is a header with number 1557</h1> 
              A text and 
            <span class='h'>some stuff</div>
            """,
    ),)

到目前为止，它在移动的和网络上都能正常工作。

可能有点晚了，但我已经做了一个项目，接受和标签
这样你就能做到

HTMLText('<b><i>SOME VERY IMPORTANT TEXT</i></b>');

并且它会将HTML转换为基于flutter的小部件，同时也会考虑暗/亮主题颜色。
https://github.com/forumics/flutter-html-text

如果您有对象列表且需要groupBy，可以使用以下链接：groupBy_in_flutter

其他答案中提到的所有软件包都不再维护（至少在我写这个答案时），这会与我使用的其他软件包产生冲突，因为这些软件包最近有更新，我最终使用了这个软件包：flutter_widget_from_html（ps：它不是我的）