如何将mp3文件从我的资源文件夹复制到文档目录，然后共享它，例如在Flutter中的whatsapp上？

flutter:
  assets:
    - assets/audio/

dependencies:
  path_provider: ^2.0.3

import 'package:path_provider/path_provider.dart';
import 'package:flutter/services.dart';
import 'dart:io';

Future<void> copyAndShareMp3() async {
  // 获取文档目录路径
  Directory docDir = await getApplicationDocumentsDirectory();

  // 获取mp3文件的资源路径
  String mp3AssetPath = 'assets/audio/example.mp3';

  // 构建目标文件路径
  String mp3DestPath = '${docDir.path}/example.mp3';

  // 复制mp3文件到文档目录
  ByteData mp3Data = await rootBundle.load(mp3AssetPath);
  final buffer = mp3Data.buffer;
  File(mp3DestPath).writeAsBytesSync(
    buffer.asUint8List(mp3Data.offsetInBytes, mp3Data.lengthInBytes)
  );

  // 共享mp3文件
  await Share.shareFiles([mp3DestPath]);
}

copyAndShareMp3();