flutter Cannot open file, path = ‘.../test.jpg‘ (OS Error: Permission denied, errno = 13)

开发 flutter 遇到没权限问题，刚学不熟搞了半天，报错信息：

Cannot open file, path = '/storage/emulated/0/Download/test.jpg' (OS Error: Permission denied, errno = 13)

1. 在 AndroidManigfest.xml 添加需要的权限，AndroidManigfest.xml 的位置：

首先在 manifest 添加权限：

    <!-- Permissions options for the `storage` group --><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

然后在 <application> 中添加对 Android10 的访问权限：

android:requestLegacyExternalStorage="true"

如图：

2.利用 permission_handler 来申请权限

在 pubspec.yaml 添加:

permission_handler: ^5.0.1+1

包引入：

import 'package:permission_handler/permission_handler.dart';

代码中申请权限:

  setPermission() async {if (await Permission.storage.request().isGranted) {   //判断是否授权,没有授权会发起授权print("获得了授权");setState(() {setPhoto();});}else{print("没有获得授权");}}

3.下面是完整代码，判断是否有权限，没有权限申请权限然后获取图片来展示，有权限直接展示图片：

import 'package:flutter/material.dart';
import 'dart:io';
import 'package:permission_handler/permission_handler.dart';void main() {runApp(MyApp());
}class MyApp extends StatelessWidget {const MyApp({Key? key}) : super(key: key);@overrideWidget build(BuildContext context) {return MaterialApp(title: 'Flutter Demo',theme: ThemeData(primarySwatch: Colors.blue,),home: const MyHomePage(title: 'Flutter Demo Home Page'),);}
}class MyHomePage extends StatefulWidget {const MyHomePage({Key? key, required this.title}) : super(key: key);final String title;@overrideState<MyHomePage> createState() => _MyHomePageState();
}class _MyHomePageState extends State<MyHomePage> {bool isPermission = false;@overrideWidget build(BuildContext context) {return Scaffold(appBar: AppBar(title: Text(widget.title),),body: setPhoto());}setPermission() async {if (await Permission.storage.request().isGranted) {   //判断是否授权,没有授权会发起授权print("获得了授权");isPermission = true;setState(() {setPhoto();});}else{print("没有获得授权");isPermission = false;}}setPhoto() {if(isPermission){print("有授权");return Center(child:(Image.file(File('/storage/emulated/0/Download/test.jpg'),width: 100,height: 100)));}else{print("申请授权");setPermission();return null;}}
}

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flutter Cannot open file, path = ‘.../test.jpg‘ (OS Error: Permission denied, errno = 13)

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