Permission Denied.... "requires that you obtain access using ACTION_OPEN_DOCUMENT", after successfully opening a folder and trying to open a file in it in android

[Sheep]

Greeting

Am able to open the folder (of which is returns the "content://com.android.externalstorage.documents/tree/..") and Qt is able to parse the folder details (numbr of files, etc), but when i try to open a specific file in the selected folder, i get this error

W AppName:  unknown unknown java.lang.SecurityException: Permission Denial: reading com.android.externalstorage.ExternalStorageProvider uri content://com.android.externalstorage.documents/tree/primary%3AlibTest%2Fsoqeqwe%2Fmain.xln from pid=28151, uid=10318 requires that you obtain access using ACTION_OPEN_DOCUMENT or related APIs

I have all persmissions set..

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

..and also dynamically invoke them before opening the folder picker dialog.

AFAIK we have to set this (ACTION_OPEN_DOCUMENT) option on the Intent object when trying to pick a file in java, but how should i do it to all files in the folder so that i can be able to read and write to them.

Note: This folder was manually created and all files in it are manually added to it!

Am using the Qml FolderDialog Component to select the folder with Qt 6.5 and android kit is clang 64-v8a

Here is my code for loading the files in selected folder

bool importMaterialLibrary(const QString &argfolder){
 QDir folderPath(argfolder);

// this is able to list all files in the folder
auto list1 = folderPath.entryInfoList(QDir::Files | QDir::NoDotAndDotDot);
  qDebug() << "My files " << list1;

// the file "main.xln" exists in the folder...hence am trying to access its  contents
  QFile mainFile(folderPath.path()+"/main.xln");
 
// this is where the error occurs
 if (!mainFile.open(QIODevice::ReadOnly)) {
    qDebug() << "Failed to open file " << mainFile.errorString();
    return false;
  }
// file is successfully opened...read its content
..... 
}

[Mr_Ada]

@Sheep I would like to know if you found an answer to this question? I am at the same point in not being able to access a file in shared area.

[Kai.]

i found this page https://ekkesapps.wordpress.com/qt-6-cmake/android-scopedstorage-filedialog/ very helpfull. In Android > 12 there are some changes to permission things.

[Mr_Ada]

@Kai I'll give it a look. Thanks. This looks like some of the changes I have made already to permissions. Except for Media which I didn't know existed.

[Mr_Ada]

@Kai I followed on in the description and changed my manifest and build.gradle, etc. I don't see any improvement on getting access to a snapshot on my phone.

[Kai.]

@Mr_Ada i have also runtime check :

...
#include <QtCore/private/qandroidextras_p.h>
...

#ifdef __ANDROID__
int setupPermission(QString permission)
{
    auto  result = QtAndroidPrivate::checkPermission(permission);
    if(result.result() == QtAndroidPrivate::PermissionResult::Denied){
        QFuture<QtAndroidPrivate::PermissionResult> resultHash = QtAndroidPrivate::requestPermission(permission);
        if(resultHash.result() == QtAndroidPrivate::PermissionResult::Denied)
            return -1;
    }
    return 0;
}
#endif

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);

#ifdef __ANDROID__
    setupPermission(QString("android.permission.CAMERA"));
    setupPermission(QString("android.permission.READ_EXTERNAL_STORAGE"));
#endif

...

cmake :

target_link_libraries(myapp
  PRIVATE
  Qt6::Core
  Qt6::CorePrivate
...

on Android SDK >= 33 you have to do this with the new permissions