如何在文本小部件颤动中显示 html 字符串
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【中文标题】如何在文本小部件颤动中显示 html 字符串【英文标题】：How to show html string in text widget flutter 【发布时间】：2019-05-17 20:03:01 【问题描述】：如何在颤振中显示 html 标记字符串，我尝试了一个插件，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>.”
我的用户flutter_html_view：“^0.5.10”这个插件
【问题讨论】：
你能发布flutter版本吗？ @NagendraBadiganti Flutter（频道测试版，v1.0.0，Mac OS X 10.13.6 17G65，语言环境 en-IN） 检查 flutter_html: ^0.8.2 依赖。它一直对我有用。我刚刚发布了一个答案。如果可行，请竖起大拇指。 这个插件根本无法很好地渲染你的html代码。阅读docsThis plugin does't support rendering full html code
Flutter 团队的 webview_flutter 插件非常适合我：***.com/a/55149298
【参考方案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 sn-p 替换，看看是否有效。
dependencies:
flutter_html: ^0.8.2
以及用于渲染 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);
,
),
),
)
【讨论】：
你知道除了flutter_html之外的另一个插件吗，这个插件不能渲染表格而且不可选，谢谢 flutter_html 现在支持| , | , |
|---|
我刚刚完成了以下操作，效果很好。
-
将 flutter_html 添加到您的 pubspec.yaml 文件中。
dependencies: flutter: sdk: flutter flutter_html: ^0.8.2
-
运行以下命令更新软件包。
flutter pub get
-
导入 flutter_html
import 'package:flutter_html/flutter_html.dart';
-
用 Html 小部件替换 Text 小部件。
child: // Text( // "Hello Programmer", // style: TextStyle(fontSize: 18), // ), Html(data:"<p>Hello <b>Flutter</b><p>"),
【讨论】：
【参考方案3】：不要使用flutter_html_view那个在documentation读的：
支持的标签
p em b 图片 视频 h1, h2, h3, h4, h5, h6 注意这个插件将一些html标签转换为flutter widgets这个插件不支持渲染完整的html代码（没有内置 支持 Flutter 中的 Web 渲染）
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
试一试，看看他们是否表现更好。
更新
在pubspec.yaml我已经添加
dependencies:
flutter_html: ^0.8.2
而我的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.
);
【讨论】：
你能告诉我你的代码吗，我已经检查过了，但 pl 没有像你的那样显示。 @DeepakGehlot 当然。我已经更新了我的答案。我刚刚修改了标准的 Flutter Activity 项目来测试它。【参考方案4】：使用flutter_webview_plugin插件
示例：
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,
),
);
【讨论】：
WebView 不能添加到小部件树中，不是吗。还是我错过了什么？ 你检查过示例代码吗？ github.com/fluttercommunity/flutter_webview_plugin/blob/master/… 它是一个 Scaffold 而不是一个小部件，如果你想插入到你现有的页面中，那么你可以在一个矩形中使用 webview flutterWebViewPlugin.launch( selectedUrl, rect: Rect.fromLTWH(0.0, 0.0 , MediaQuery.of(context).size.width, 300.0), userAgent: kAndroidUserAgent, ); 是的，我有:-)。这就是我提出问题的原因 Warning: webview 没有集成在小部件树中，它是颤振视图之上的原生视图。您将无法使用小吃栏、对话框......示例代码将其用作不在小部件树中的页面。 创建你自己的脚手架并将webview渲染在一个矩形内，然后你可以使用snackbars、dialog等【参考方案5】：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、abbr、首字母缩略词、地址、文章、aside、b、bdi、bdo、big、blockquote、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，模板，tfoot，th，thead，时间，tr，tt，u，ul，变量
示例用法：
Column(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
new Html(
data: "<b>Welcome</b>,
defaultTextStyle: TextStyle(fontSize: 15),
),
],
)
【讨论】：
【参考方案6】：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，它在移动和网络上都可以正常工作。
【讨论】：
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