我用downloads_path_provider包写下载目录。我将其设置为推荐 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />用于项目AndroidManifest.xml

但是当我尝试写时我得到这个错误 E/flutter (26091): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: FileSystemException: Cannot open file, path = '/storage/emulated/0/Download/secure-strorage-backup.txt' (OS Error: Permission denied, errno = 13)

这是代码

  final file = _localFile;
  file.writeAsString('1234  5678\n');
  file.writeAsString('1234  5678\n');

  File get _localFile {
    final path = _downloadsDirectory.path;
    return File('$path/secure-strorage-backup.txt');
  }

如何写入下载文件夹？

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.user.myappname">
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <application
        android:name="io.flutter.app.FlutterApplication"
        android:label="Secure Storage"
        ...

这是我的下载方式

  void initState() {
    super.initState();
    initDownloadsDirectoryState();
  }

  Future<void> initDownloadsDirectoryState() async {
    Directory downloadsDirectory;
    try {
      downloadsDirectory = await DownloadsPathProvider.downloadsDirectory;
    } on PlatformException {
      print('Could not get the downloads directory');
    }
    if (!mounted) return;
    setState(() {
      _downloadsDirectory = downloadsDirectory;
    });
  }