Flutter开发笔记 —— 语音消息功能实现

import 'package:flutter/material.dart';
import 'package:speech_to_text/speech_to_text.dart' as stt;
 
class VoiceMessageScreen extends StatefulWidget {
  @override
  _VoiceMessageScreenState createState() => _VoiceMessageScreenState();
}
 
class _VoiceMessageScreenState extends State<VoiceMessageScreen> {
  stt.SpeechToText speechToText = stt.SpeechToText();
  bool _isListening = false;
  String _speechText = '';
 
  @override
  void dispose() {
    super.dispose();
    speechToText.stopListening();
  }
 
  void _startListening() async {
    bool available = await speechToText.initialize();
    if (available) {
      setState(() => _isListening = true);
      speechToText.listen(onResult: (result) {
        setState(() => _speechText = result.recognizedWords);
      });
    }
  }
 
  void _stopListening() {
    speechToText.stopListening();
    setState(() => _isListening = false);
  }
 
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('语音消息'),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(_speechText),
            SizedBox(height: 20.0),
            _isListening 
              ? IconButton(
                  icon: Icon(Icons.mic),
                  color: Colors.red,
                  onPressed: _stopListening,
                  iconSize: 48.0,
                )
              : IconButton(
                  icon: Icon(Icons.mic_none),
                  color: Colors.grey,
                  onPressed: _startListening,
                  iconSize: 48.0,
                ),
          ],
        ),
      ),
    );
  }
}

这段代码使用了speech_to_text插件，并展示了如何在Flutter应用中实现基本的语音识别功能。代码中包含了初始化、开始和停止监听语音的逻辑，并且在用户停止说话时更新UI显示识别的文本。在dispose方法中确保当Widget不再使用时停止监听，以避免资源泄露。