在Flutter上显示带有表情符号的文本

我有一些包含表情符号的文本，我试图在“文本”小部件上显示它们。但是，它们似乎显示为外来字符。Flutter是否支持显示表情符号？应该适用于iOS和Android

Flutter支持表情符号。这是一些演示表情文字输入的代码。（如果看到的是外来字符，则很可能是将字节解码为ASCII而不是UTF-8；如果您使用演示问题的代码更新问题，我们可以向您展示如何解决此问题。）

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

void main() {
  runApp(new MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return new MaterialApp(
      title: 'Flutter Demo',
      home: new MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

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

class _MyHomePageState extends State {
  String _message = '';

  Future _promptForString(String label, { String hintText }) {
    final TextEditingController cOntroller= new TextEditingController();
    return showDialog(
      context: context,
      child: new AlertDialog(
        title: new Text(label),
        content: new TextFormField(
          controller: controller,
          decoration: new InputDecoration(hintText: hintText),
        ),
        actions: [
          new FlatButton(
            onPressed: () => Navigator.pop(context),
            child: const Text('CANCEL'),
          ),
          new FlatButton(
            onPressed: () => Navigator.pop(context, controller.text),
            child: const Text('OK'),
          ),
        ],
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return new Scaffold(
      appBar: new AppBar(
        title: new Text(_message),
      ),
      body: new Center(
        child: new Text(_message, style: Theme.of(context).textTheme.display2),
      ),
      floatingActionButton: new FloatingActionButton(
        child: new Icon(Icons.edit),
        onPressed: () async {
          String message = await _promptForString('New text', hintText: 'Try emoji!');
          if (!mounted)
            return;
          setState(() {
            _message = message;
          });
        },
      ),
    );
  }
}