如何在文本小部件 flutter 中显示 html 字符串

Question

如何在 flutter 中显示 html 标签字符串，我试过一个插件但它不起作用。

new HtmlView(
     data: html,
     baseURL: "", // optional, type String
     onLaunchFail: (url) { // optional, type Function
     print("launch $url failed");
   }

这是我的 html

“Follow<a class='sup'><sup>pl</sup></a> what was sent down to you from your Lord, and do not follow other guardians apart from Him. Little do <span class='h'>you remind yourselves</span><a class='f'><sup f=2437>1</sup></a>.”   

我用户 flutter_html_view: "^0.5.10" 这个插件

Answer 1

这个插件没有任何问题，我只是用你的 HTML 创建了一个示例，它工作正常。 尝试用下面的代码段替换，看看是否有效。

dependencies:
  flutter_html: ^0.8.2
        

以及用于呈现 html 的导入和代码

import 'package:flutter_html/flutter_html.dart';
import 'package:html/dom.dart' as dom;


 body: new Center(
            child: SingleChildScrollView(
              child: Html(
                data: """
                <div>Follow<a class='sup'><sup>pl</sup></a> 
                  Below hr
                    <b>Bold</b>
                <h1>what was sent down to you from your Lord</h1>, 
                and do not follow other guardians apart from Him. Little do 
                <span class='h'>you remind yourselves</span><a class='f'><sup f=2437>1</sup></a></div>
                """,
                padding: EdgeInsets.all(8.0),
                onLinkTap: (url) {
                  print("Opening $url...");
                },
                customRender: (node, children) {
                  if (node is dom.Element) {
                    switch (node.localName) {
                      case "custom_tag": // using this, you can handle custom tags in your HTML 
                        return Column(children: children);
                    }
                  }
                },
              ),
            ),
          )

Answer 2

我刚刚完成了以下操作，效果很好。

1. 将flutter_html添加到您的 pubspec.yaml 文件中。

 dependencies: flutter: sdk: flutter flutter_html: ^0.8.2

2. 运行以下命令以更新软件包。

flutter pub get

3. 导入flutter_html

import 'package:flutter_html/flutter_html.dart';

4. 用 Html 小部件替换文本小部件。

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

Answer 3

不要使用在文档中阅读的flutter_html_view ：

支持的标签

• p
• 时间
• b
• 图像
• 视频
• h1,
• h2,
• h3,
• h4,
• h5,
• h6
• 笔记

这个插件将一些html标签转换为flutter widgets这个插件不支持渲染完整的html代码（flutter中没有内置对web渲染的支持）

所以它根本不能很好地呈现你的html，因为它不能。

但是你可以找到其他的插件，比如flutter_html

https://github.com/Sub6Resources/flutter_html

并给他们一个尝试，看看他们是否表现更好。

更新

在pubspec.yaml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.
    );
  }
}

Answer 4

将以下内容添加到您的pubspec.yaml文件中：

dependencies:
  flutter_html:

当前支持的 HTML 标签：

a，缩写，首字母缩略词，地址，文章，放在一边，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，figcaption，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，section，small，span，strike，strong，sub，sup，table，tbody，td，template，tfoot，th，thead，time，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),
       ),
     ],
)

Answer 5

使用flutter_webview_plugin插件

例子：

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

自定义矩形内的 Webview

final flutterWebviewPlugin = new FlutterWebviewPlugin();

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

Answer 6

在 pubspec.yml 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，它在移动和网络上都可以正常工作。

Answer 7

可能有点晚了，但我做了一个接受和标记的项目

所以你可以这样做

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

它会将您的 HTML 转换为基于 flutter 的小部件，并尊重深色/浅色主题 colors。

https://github.com/forumics/flutter-html-text

Answer 8

如果您有对象列表并且需要分组，您可以使用以下链接： groupBy_in_flutter

Answer 9

其他答案中提到的所有包都不再维护（至少当我写这个答案时），它会与我使用的其他最近更新的包产生冲突，我最终使用这个 package： flutter_widget_from_html （ps：它不是我的)