如何将音频 url 转换为 flutter web 中的文件？答案

【问题标题】：how to convert audio url into a file in flutter web?如何将音频 url 转换为 flutter web 中的文件？
【发布时间】：2021-09-07 15:03:55
【问题描述】：

我正在使用麦克风包录制语音，Flutter 将音频存储一段时间，我们可以作为音频 url 播放，但我需要将语音 url 以文件的形式存储在 firebase 存储中。听我的代码....

    void handleAudioState(AudioState state) {
        setState(() {
          if (audioState == AudioState.not) {
        // Starts recording
           try{
             _recorder.start();
             audioState = AudioState.recording;
       }
          catch(e){
           print(e.toString());
       }
        // Finished recording
      } 
         else if (audioState == AudioState.recording) {
         audioState = AudioState.play;
         _recorder.stop();
        // Play recorded audio
      } 
         else if (audioState == AudioState.play) {
         audioState = AudioState.stop;
         dynamic rec=_recorder.toBytes();
         print(rec.toString());
         // var file= File.fromRawPath(rec);
         //print(file);
         _audioPlayer=AudioPlayer();
         _audioPlayer.setUrl(_recorder.value.recording!.url).then((value){
          print(_recorder.value.recording!.url);
          return _audioPlayer.play().then((value){
            setState(() {
              audioState = AudioState.play;
            });
          });
        });
        // Stop recorded audio
      } else if (audioState == AudioState.stop) {
        audioState = AudioState.play;
        _audioPlayer.stop();
      }
    });
  }

 void handleAudioState(AudioState state) {
    setState(() {
      if (audioState == AudioState.not) {
        // Starts recording
       try{
         _recorder.start();
         audioState = AudioState.recording;
       }
       catch(e){
         print(e.toString());
       }
        // Finished recording
      } else if (audioState == AudioState.recording) {
        audioState = AudioState.play;
        _recorder.stop();
        // Play recorded audio
      } else if (audioState == AudioState.play) {
        audioState = AudioState.stop;
        dynamic rec=_recorder.toBytes();
        print(rec.toString());
       // var file= File.fromRawPath(rec);
       //print(file);
        _audioPlayer=AudioPlayer();
        _audioPlayer.setUrl(_recorder.value.recording!.url).then((value){
          print(_recorder.value.recording!.url);
          return _audioPlayer.play().then((value){
            setState(() {
              audioState = AudioState.play;
            });
          });
        });
        // Stop recorded audio
      } else if (audioState == AudioState.stop) {
        audioState = AudioState.play;
        _audioPlayer.stop();
      }
    });
  }

我正在使用以下软件包只是_音频：^0.8.0 麦克风：请让我知道如何做到这一点，感谢期待

【问题讨论】：

标签： flutter web audio microphone

【解决方案1】：

您必须先将录制的音频转换为字节，然后使用 dart html 中的 File 类创建文件；

import 'dart:html' as html;

final file = html.File(bytes, filename);

您可以上传此文件，然后将其上传到 Firebase 存储。 Firebase 存储也支持字节上传，因此您可以直接上传字节

【讨论】：