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I wrote an plugin to access the ExternalStorageDirectory on Android via Dart.

android specific code for the plugin:

@Override
 public void onMethodCall(MethodCall call, Result result) 
 if (call.method.equals("getUserDataDirectory")) 
 String path = Environment.getExternalStorageDirectory().getAbsolutePath();
 result.success(path);
 else 
 result.notImplemented();
 
 

The returned path is correct storage/emulated/0. But now if i try to iterate throw the directory i get an Permission denied.

error.log

[ERROR:topaz/lib/tonic/logging/dart_error.cc(16)] Unhandled exception:
E/flutter ( 3381): FileSystemException: Directory listing failed, path = '/storage/emulated/0/' (OS Error: Permission denied, errno = 13)
E/flutter ( 3381): #0 _Directory._fillWithDirectoryListing (dart:io-patch/directory_patch.dart:32)
E/flutter ( 3381): #1 _Directory.listSync (directory_impl.dart:214)
E/flutter ( 3381): #2 _MyAppState.initPathRequest (/data/user/0/com.yourcompany.userdatadirectoryexample/cache/exampleIAKNFP/example/lib/main.dart:34:25)

main.dart

 path = await Userdatadirectory.getUserDataDirectory;

 var dir = new Directory(path);

 List contents = dir.listSync();
 for (var fileOrDir in contents) 
 print(fileOrDir.path);
 

my example/android/app/src/AndroidManifest.xml contains these additional premissions:

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

What is the problem here?

You can use either of these 2 package to ask for device permission: https://pub.dartlang.org/packages/simple_permissions or https://pub.dartlang.org/packages/permission . They have simple APIs and comprehensive examples.