如何在flutter中打开emoji键盘

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

class EmojiKeyboardPage extends StatefulWidget {
  @override
  _EmojiKeyboardPageState createState() => _EmojiKeyboardPageState();
}

class _EmojiKeyboardPageState extends State<EmojiKeyboardPage> {
  bool isEmojiKeyboardOpen = false;
  TextEditingController textEditingController = TextEditingController();

  void toggleEmojiKeyboard() {
    setState(() {
      isEmojiKeyboardOpen = !isEmojiKeyboardOpen;
    });
  }

  void onEmojiSelected(Emoji emoji) {
    textEditingController.text += emoji.emoji;
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Emoji Keyboard Example'),
      ),
      body: Column(
        children: [
          Expanded(
            child: TextField(
              controller: textEditingController,
            ),
          ),
          isEmojiKeyboardOpen ? buildEmojiPicker() : Container(),
          ElevatedButton(
            onPressed: toggleEmojiKeyboard,
            child: Text(isEmojiKeyboardOpen ? '关闭Emoji键盘' : '打开Emoji键盘'),
          ),
        ],
      ),
    );
  }

  Widget buildEmojiPicker() {
    return Container(
      height: 200,
      child: EmojiPicker(
        onEmojiSelected: onEmojiSelected,
        rows: 3,
        columns: 7,
      ),
    );
  }
}