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flutter - Flutter - 如何保存和播放录制的音频文件？

问题描述

我这辈子都想不通。我要做的就是录制音频（如在录音机中），然后才能播放。

录音机类：

import 'dart:typed_data';
import 'package:flutter/material.dart';
import 'package:flutter_sound/flutter_sound.dart';
import 'package:path_provider/path_provider.dart';
import 'package:permission_handler/permission_handler.dart';

//String _pathToAudio = '/sdcard/myAudio.aac';
String _fileName = 'myAudio.aac';
String _path = "/storage/emulated/0";

class Recorder {
  FlutterSoundRecorder? _recorder;
  bool _isRecorderInitialized = false;
  bool get isRecording => _recorder!.isRecording;

  Future init() async {
    _recorder = FlutterSoundRecorder();
    //final directory = "/sdcard/downloads/";
    //Directory? extStorageDir = await getExternalStorageDirectory();
    //String _path = directory.path;

    final status = await Permission.microphone.request();
    if (status != PermissionStatus.granted) {
      throw RecordingPermissionException('Recording permission required.');
    }

    await _recorder!.openAudioSession();
    _isRecorderInitialized = true;
  }

  void _writeFileToStorage() async {
    File audiofile = File('$_path/$_fileName');
    Uint8List bytes = await audiofile.readAsBytes();
    audiofile.writeAsBytes(bytes);
  }

  void dispose() {
    _recorder!.closeAudioSession();
    _recorder = null;
    _isRecorderInitialized = false;
  }

  Future record() async {
    if (!_isRecorderInitialized) {
      return;
    }
    print('recording....');
    await _recorder!.startRecorder(
      toFile: '$_fileName',
      //codec: Codec.aacMP4,
    );
  }

  Future stop() async {
    if (!_isRecorderInitialized) {
      return;
    }
    await _recorder!.stopRecorder();
    _writeFileToStorage();
    print('stopped....');
  }

  Future toggleRecording() async {
    if (_recorder!.isStopped) {
      await record();
    } else {
      await stop();
    }
  }
}

目前我得到的错误是“无法打开文件，路径='/storage/emulated/0/myAudio.aac'（操作系统错误：没有这样的文件或目录，errno = 2）”。

我正在使用flutter_sound

标签： flutterdartaudiofilesystems

解决方案

尝试使用path_provider初始化文件路径。

将这两行添加到init函数的开头。

    final directory = await getApplicationDocumentsDirectory();
    _path = directory.path; // instead of "/storage/emulated/0"

不确定您如何尝试访问和播放该文件，但在我看来，它至少清除了错误。

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