在Flutter中解码UTF8字符串

3

我正在尝试在文本小部件上显示一串带有表情符号的字符串。这个字符串是使用UTF8编码的。我的问题是如何解码整个字符串,以便它能正确地显示到文本中?

以下是包含表情符号的字符串:

Testing emoticons post \ud83d\ude18\ud83d\udc4c\ud83e\udd70\ud83d\ude02\ud83e\udd73\u2708\ufe0f\ud83d\udc4a\ud83d\ude01\ud83d\ude01\ud83e\udd23\ud83d\ude04\ud83d\ude01\u2708\ufe0f\ud83d\ude01\ud83d\ude0d\ud83d\ude4f\ud83e\udd22\ud83d\ude2d

目前,我有以下函数:

String utf8convert(String text) {
   List<int> bytes = text.toString().codeUnits;
   return utf8.decode(bytes);
}

如果您直接使用utf8.decode转换文本,它是否无法正常工作? - hoangquyy
@hoangquyy 它没有起作用。 - kenjilaurel
@hoangquyy 如果我直接将文本复制并粘贴到文本小部件中,它可以正常工作,但如果是从API获取的,则表情符号无法解码。 - kenjilaurel
你能给我你的 API 吗,这样我就可以尝试一下了吗? - hoangquyy
我认为你获取了错误的字符串。 - hoangquyy
显示剩余10条评论
3个回答

7

如果你正在使用API获取带有表情符号的数据。

final response =
      await _httpClient.get(uri);
jsonDecode(utf8.decode(response.bodyBytes))

0
你可以使用 dart:convert 中的 jsonDecode。例如,如果您从 Api 接收文本数据,您可能会接收包含特殊格式字符串(如表情符号或重音字符)的数据,如 '\udc4a\ud83d\ude01...'。使用 JsonDecode 可以帮助正确显示字符串。
 final response = await http.post(Uri.parse('apiaddress'), body: _body);
  var decode = jsonDecode(utf8.decode(response.bodyBytes));
  print(decode);

0

直接使用Text小部件可以正常工作
代码片段 Text('\ud83d\ude18\ud83d\udc4c\ud83e\udd70\ud83d\ude02\ud83e\udd73\u2708\ufe0f\ud83d\udc4a\ud83d\ude01\ud83d\ude01\ud83e\udd23\ud83d\ude04\ud83d\ude01\u2708\ufe0f\ud83d\ude01\ud83d\ude0d\ud83d\ude4f\ud83e\udd22\ud83d\ude2d'),

完整代码

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

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      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;


  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 a 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>[
            Text('\ud83d\ude18\ud83d\udc4c\ud83e\udd70\ud83d\ude02\ud83e\udd73\u2708\ufe0f\ud83d\udc4a\ud83d\ude01\ud83d\ude01\ud83e\udd23\ud83d\ude04\ud83d\ude01\u2708\ufe0f\ud83d\ude01\ud83d\ude0d\ud83d\ude4f\ud83e\udd22\ud83d\ude2d'),
            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.
    );
  }
}

enter image description here


2
是的,如果您直接将其粘贴到文本小部件上,它可以工作,但如果它来自像我上面发布的API,那么表情符号将无法正常工作。 - kenjilaurel
这个问题有什么解决方案吗? - MrDumb

网页内容由stack overflow 提供, 点击上面的
可以查看英文原文,
原文链接