如何使用flutter发送语音消息？

import 'package:microphone/microphone.dart';

// 开始录制语音
startRecording() async {
  await Microphone.startRecorder(audioOutputFormat: AudioOutputFormat.AAC);
}

// 停止录制语音
stopRecording() async {
  var audioData = await Microphone.stopRecorder();
  // 将录制的音频数据保存到文件
  // ...
}

import 'package:audioplayers/audioplayers.dart';

// 播放语音消息
playAudio(String filePath) {
  AudioPlayer audioPlayer = AudioPlayer();
  audioPlayer.play(filePath, isLocal: true);
}

FlatButton(
  onPressed: () {
    startRecording();
  },
  child: Text('开始录制'),
),

FlatButton(
  onPressed: () {
    stopRecording();
  },
  child: Text('停止录制'),
),

FlatButton(
  onPressed: () {
    playAudio('path_to_audio_file');
  },
  child: Text('播放语音消息'),
),