Access to the path is denied android
Asked by:
Question
I’m trying to enumerate through all files located in «/storage/emulated/0/DCIM» and «/storage/emulated/0/Pictures». However I’m getting an Access Denied exception when trying to enumerate through them.
I’ve added the READEXTERNALSTORAGE and WRITEEXTERNALSTORAGE permissions and used the Xamarin.Essentials permissions to ask the user at runtime to give access. The app info shows that the app has indeed access to storage.
Does anyone know why I’m still getting this exception?
Xamarin Forms: 4.4.0.991757 Target Android API: 29, minimum 28. (Going to use the app at home)
Thank you in advance.
All replies
maybe you need runtime permissions
Thank you but no, I’ve already asked for permissions on runtime. Hence the line «. and used the Xamarin.Essentials permissions to ask the user at runtime to give access.».
What’s the full log of this error? If it is convenient for you ,could you please post a basic demo or some code snippet so that we can test on our side?
I can’t seem to post a reply. «Has to be approved», but doesn’t seem to get approved. I’ve sent you a message.
Is your app based on xamarin form, right? I will test myself.
Hi In your device, you must activate setting / application / Myapplication/permissions/storage.
@jezh said: Is your app based on xamarin form, right? I will test myself.
Yes, Xamarin Forms.
@readn said: Hi In your device, you must activate setting / application / Myapplication/permissions/storage.
As I already said, storage is granted in app settings. But thanks anyways.
I created a demo to achieve this function,and use PermissionsPlugin to request permission.It works properly. The main code is as follows, you can check it.
Note: You can follow the PermissionsPlugin to add permission. And there is a sample withe this link. It should be helpful for you.
Thank you for your demo. Your code is almost the same as what I sent you. You’re using Plugin.Permissions but it actually uses Xamarin.Essentials to ask for permissions.
However, I copied over your code (and used Plugin.Permissions) and it still throws the exception when trying to access the file system. Tried it on my physical device and emulator. Both Android 10. Xamarin Forms 4.4.0.991265.
Could you send me your project to test it out myself? Maybe you’re on a lower API or Forms version than me?
@StephanBisschop Hi friend, I have put the demo into the attachement, you can check it.
It seems to not work when the Android project is set to compile for Android 10. Even with your working project. The Alerts return granted but after that the exception gets thrown again.
Could you try it at your end?
Yes, it is just the case as you said. When we check document getExternalStoragePublicDirectory, we will see
So, when an app targets Build.VERSION_CODES.Q, the path returned from this method is no longer directly accessible to apps.
Stacktrace: System.UnauthorizedAccessException: ‘Access to the path ‘/storage/emulated/0′ is denied.’
03-23 10:42:00.923 D/Mono ( 9121): DllImport attempting to load: ‘/system/lib64/liblog.so’. 03-23 10:42:00.924 D/Mono ( 9121): DllImport loaded library ‘/system/lib64/liblog.so’. 03-23 10:42:00.925 D/Mono ( 9121): DllImport searching in: ‘/system/lib64/liblog.so’ (‘/system/lib64/liblog.so’). 03-23 10:42:00.925 D/Mono ( 9121): Searching for ‘androidlogprint’. 03-23 10:42:00.925 D/Mono ( 9121): Probing ‘androidlogprint’. 03-23 10:42:00.925 D/Mono ( 9121): Found as ‘androidlogprint’. 03-23 10:42:00.929 I/MonoDroid( 9121): UNHANDLED EXCEPTION: 03-23 10:42:00.933 I/MonoDroid( 9121): System.UnauthorizedAccessException: Access to the path ‘/storage/emulated/0’ is denied. —> System.IO.IOException: Permission denied 03-23 10:42:00.933 I/MonoDroid( 9121): — End of inner exception stack trace — 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Enumeration.FileSystemEnumerator 1[TResult].CreateDirectoryHandle (System.String path, System.Boolean ignoreNotFound) [0x0002a] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerator.Unix.cs:89 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Enumeration.FileSystemEnumerator 1[TResult]..ctor (System.String directory, System.IO.EnumerationOptions options) [0x00048] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerator.Unix.cs:49 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Enumeration.FileSystemEnumerable 1+DelegateEnumerator[TResult]..ctor (System.IO.Enumeration.FileSystemEnumerable 1[TResult] enumerable) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerable.cs:57 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Enumeration.FileSystemEnumerable 1[TResult]..ctor (System.String directory, System.IO.Enumeration.FileSystemEnumerable 1+FindTransform[TResult] transform, System.IO.EnumerationOptions options) [0x00042] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerable.cs:29 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Enumeration.FileSystemEnumerableFactory.UserFiles (System.String directory, System.String expression, System.IO.EnumerationOptions options) [0x00014] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Enumeration/FileSystemEnumerableFactory.cs:90 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Directory.InternalEnumeratePaths (System.String path, System.String searchPattern, System.IO.SearchTarget searchTarget, System.IO.EnumerationOptions options) [0x0003c] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Directory.cs:178 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Directory.GetFiles (System.String path, System.String searchPattern, System.IO.EnumerationOptions enumerationOptions) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Directory.cs:140 03-23 10:42:00.933 I/MonoDroid( 9121): at System.IO.Directory.GetFiles (System.String path, System.String searchPattern) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2019-10/android/release/external/corefx/src/System.IO.FileSystem/src/System/IO/Directory.cs:134 03-23 10:42:00.933 I/MonoDroid( 9121): at BisschopFotos.App.Droid.Services.FileSystem+<>cDisplayClass10. b0 () [0x00007] in D:\Stephan\Documents\Projects\BisschopFotos\BisschopFotos\BisschopFotos.App\BisschopFotos.App.Android\Services\FileSystem.cs:30 03-23 10:42:00.933 I/MonoDroid( 9121): at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in :0 03-23 10:42:00.933 I/MonoDroid( 9121): at Java.Lang.IRunnableInvoker.nRun (System.IntPtr jnienv, System.IntPtr nativethis) [0x00009] in :0 03-23 10:42:00.933 I/MonoDroid( 9121): at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.62(intptr,intptr) 03-23 10:42:00.942 W/sschopfotos.ap( 9121): JNI RegisterNativeMethods: attempt to register 0 native methods for android.runtime.JavaProxyThrowable 03-23 10:42:00.945 D/Mono ( 9121): DllImport searching in: ‘_Internal’ (‘(null)’). 03-23 10:42:00.945 D/Mono ( 9121): Searching for ‘javainteropjnienvthrow’. 03-23 10:42:00.945 D/Mono ( 9121): Probing ‘javainteropjnienvthrow’. 03-23 10:42:00.945 D/Mono ( 9121): Found as ‘javainteropjnienvthrow’. System.UnauthorizedAccessException: ‘Access to the path ‘/storage/emulated/0′ is denied.’
03-23 10:42:02.108 E/mono ( 9121): 03-23 10:42:02.108 E/mono ( 9121): Unhandled Exception: 03-23 10:42:02.108 E/mono ( 9121): System.UnauthorizedAccessException: Access to the path ‘/storage/emulated/0’ is denied. —> System.IO.IOException: Permission denied 03-23 10:42:02.108 E/mono ( 9121): — End of inner exception stack trace — 03-23 10:42:02.108 E/mono ( 9121): at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.62(intptr,intptr) 03-23 10:42:02.108 E/mono ( 9121): at (wrapper native-to-managed) Android.Runtime.DynamicMethodNameCounter.62(intptr,intptr) 03-23 10:42:02.108 E/mono-rt ( 9121): [ERROR] FATAL UNHANDLED EXCEPTION: System.UnauthorizedAccessException: Access to the path ‘/storage/emulated/0’ is denied. —> System.IO.IOException: Permission denied 03-23 10:42:02.108 E/mono-rt ( 9121): — End of inner exception stack trace — 03-23 10:42:02.108 E/mono-rt ( 9121): at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.62(intptr,intptr) 03-23 10:42:02.108 E/mono-rt ( 9121): at (wrapper native-to-managed) Android.Runtime.DynamicMethodNameCounter.62(intptr,intptr)
Code snippet in Xamarin.Android project. (implements IFileSystem)
public IEnumerable GetFiles() < //var filePath = Environment.GetExternalStoragePublicDirectory(Environment.DirectoryPictures); //var canRead = filePath.CanRead(); // This returns false var files = new [] < "" >; var path = «/storage/emulated/0/Pictures»; //Environment.GetExternalStoragePublicDirectory(Android.OS.Environment.DirectoryPictures).AboslutePath; files = Directory.GetFiles(path); //This line throws the exception
Code snippet in Xamarin.Forms project
().ConfigureAwait(false); await Permissions.RequestAsync
if (await Permissions.CheckStatusAsync
().ConfigureAwait(false) != PermissionStatus.Granted && await Permissions.CheckStatusAsync
(Code markdown didn’t seem to like my code, so put it in quote markdown)
Источник
