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I want to store my document file into '/storage/emulated/0/Download/' . I got this error :

Unhandled Exception: FileSystemException: Cannot open file, path = '/storage/emulated/0/Download/file.pdf' (OS Error: Permission denied, errno = 13)

Here is my code:

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);
                Yes, make sense.  If your targetSdkVersion is 28, don't need this line. If tour targetSdkVersion is 29 or more, need this line
– Matias de Andrea
                May 15, 2021 at 10:31
                After adding this, if you get error: attribute android:requestLegacyExternalStorage not found, check this answer. Specifically, make sure you have compileSdkVersion = 29 in android/app/build.gradle
– Stack Underflow
                May 20, 2021 at 19:24
Just add the following lines in to your android manifest if you're on android 10/Q
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
   <application
        android:requestLegacyExternalStorage="true"
                This work for me... Thank. I put android:requestLegacyExternalStorage="true" it work fine now
– Grafritz Design
                Apr 7, 2021 at 19:48
before download action you need check storage permission:
var status = await Permission.storage.status;
                  if (!status.isGranted) {
                    await Permission.storage.request();
hope to help some body
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>
for more info try out this link
                So go to the setting/apps and check your application's  permissions too in your real device
– Aamil Silawat
                Mar 6, 2020 at 6:30
In my cases none of the solutions worked, finally what worked was to remove from android/app/build.gradle the reference to "targetSdkVersion XX" inside defaultConfig{}
Now everything works as expected, I guess it is a bug in the framework.
You have to add  android:requestLegacyExternalStorage="true" this in AndroidManifest.xml file.
<application 
android:label="app_name"
        android:icon="@mipmap/ic_launcher"
        android:requestLegacyExternalStorage="true"
 </application>
My case was that it was possible to access directory. but couldn't read file.
final path= "${await ExternalPath.getExternalStoragePublicDirectory(ExternalPath.DIRECTORY_DOCUMENTS)}/sub";
final dir= Directory(path);
final l = dir.listSync(); // 1. works fine until here
for( final d in l){
      final  str = await File("${d.path}/info.json").readAsString(); // 2. permission error here
   }catch(e){
     print(e);
for solving this problem, I included android.permission.MANAGE_EXTERNAL_STORAGE permission.
like belows.
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<application
     android:requestLegacyExternalStorage="true"
After long Research i find this Solution and it will work on all Android 10+
Just change await Permission.storage.request() to await     Permission.manageExternalStorage.request() in your Permission Handler or Requester class.
Because this change will give you full access to Media Storage excluding Restricted Storage.
Detail Example:
First Create a method.
Future<AppPermissionStatus> askForPhotoGalleryPermission(
  BuildContext context) async {
var status = Platform.isIOS
    ? await Permission.photos.request()
    : await Permission.manageExternalStorage.request(); 
AppPermissionStatus permissionStatus = AppPermissionStatus.NotAvailable;
if (status.isGranted) {
  permissionStatus = AppPermissionStatus.Granted;
  return permissionStatus;
} else if (status.isDenied) {
  permissionStatus = AppPermissionStatus.Denied;
  return permissionStatus;
} else if (status.isRestricted) {
  permissionStatus = AppPermissionStatus.Restricted;
  return permissionStatus;
} else if (status.isPermanentlyDenied) {
  permissionStatus = AppPermissionStatus.PermanentlyDenied;
return permissionStatus;
How to call this Method.
 void getRequiredPermission(BuildContext context) async {
 AppPermissionStatus permissionStatus =
    await AppPermission().askForPhotoGalleryPermission(context);
  setState(() {
  if (permissionStatus == AppPermissionStatus.Granted) {
    hasPermission = true;
  } else if (permissionStatus == AppPermissionStatus.PermanentlyDenied) {
    hasPermission = false;
  } else {
    hasPermission = false;
        
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