如何解决OS错误:权限被拒绝，errno = 13

本文介绍了如何解决OS错误:权限被拒绝，errno = 13的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我是Flutter的新手.我想将文档文件存储到'/storage/emulated/0/Download/'中.我有关于Unhandled Exception: FileSystemException: Cannot open file, path = '/storage/emulated/0/Download/file.pdf' (OS Error: Permission denied, errno = 13)

I am new in Flutter. I want to store my document file into '/storage/emulated/0/Download/'. I have error about Unhandled Exception: FileSystemException: Cannot open file, path = '/storage/emulated/0/Download/file.pdf' (OS Error: Permission denied, errno = 13)

这是我的代码:

void download() async {
http.Response response = await http.post(url, headers: {"Accept": "application/json", HttpHeaders.authorizationHeader: 'Bearer}});

  File file = new File('/storage/emulated/0/Download/file.pdf');
  await file.writeAsBytes(response.bodyBytes);
}

推荐答案

确保像这样在AndroidManifest file中定义权限:

Make sure you defined permissions in AndroidManifest file like this :

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.xxx.yyy">
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
...
</manifest>

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