Android + MANAGE_EXTERNAL_STORAGE permissions problem.

[Carlos Azure]

Hi,

I am making a C++ Qt (Qt6.9.0) application for Linux, and I am calling:

QString folderPath = QFileDialog::getExistingDirectory(this, "Select Folder");

QString folderPath = QFileDialog::getExistingDirectory(this, "Select Folder");

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The dialog appears, but there appears the message: "Can't use this folder. To protect your privacy, choose another folder". I am trying to use the root of the internal storage and the root of the SD card.

The following permissions are granted on the app:

D/default : Permissions found: 6
D/default : Permission: "android.permission.ACCESS_NETWORK_STATE"
D/default : Permission: "android.permission.INTERNET"
D/default : Permission: "android.permission.MANAGE_EXTERNAL_STORAGE"
D/default : Permission: "android.permission.READ_EXTERNAL_STORAGE"
D/default : Permission: "android.permission.WRITE_EXTERNAL_STORAGE"
D/default : Permission: "org.qtproject.example.uiarchivos.DYNAMIC_RECEIVER _NOT_EXPORTED_PERMISSION"

I configured the ones for the storage in the CMakeLists.txt file:

....

# Define Android permissions
set_property(TARGET androidBrowser PROPERTY QT_ANDROID_PERMISSIONS
    "android.permission.READ_EXTERNAL_STORAGE"
    "android.permission.WRITE_EXTERNAL_STORAGE"
    "android.permission.MANAGE_EXTERNAL_STORAGE"
)

# Define Android permissions
set_property(TARGET androidBrowser PROPERTY QT_ANDROID_PERMISSIONS
    "android.permission.READ_EXTERNAL_STORAGE"
    "android.permission.WRITE_EXTERNAL_STORAGE"
    "android.permission.MANAGE_EXTERNAL_STORAGE"
)

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.....

In main.cpp I do:

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    requestPermissions(); // does nothing unless it is Android.
....etc, code to print the permissions that I got and code for my aplication...
    return app.exec();
}

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    requestPermissions(); // does nothing unless it is Android.
....etc, code to print the permissions that I got and code for my aplication...
    return app.exec();
}

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With requestPermissions as follows:

void requestPermissions()
{
#ifdef Q_OS_ANDROID
    QJniObject activity = QNativeInterface::QAndroidApplication::context();
    QJniEnvironment env;
 
    QStringList permissions = {
        "android.permission.READ_EXTERNAL_STORAGE",
        "android.permission.WRITE_EXTERNAL_STORAGE",
        "android.permission.MANAGE_EXTERNAL_STORAGE"
    };
 
    jclass stringClass = env->FindClass("java/lang/String");
    jobjectArray jPermissions = env->NewObjectArray(permissions.size(), stringClass, nullptr);
 
    for (int i = 0; i < permissions.size(); ++i) {
        QJniObject jstr = QJniObject::fromString(permissions[i]);
        env->SetObjectArrayElement(jPermissions, i, jstr.object<jstring>());
    }
 
    QJniObject::callStaticMethod<void>(
        "androidx/core/app/ActivityCompat",
        "requestPermissions",
        "(Landroid/app/Activity;[Ljava/lang/String;I)V",
        activity.object<jobject>(),
        jPermissions,
        1
        );
#endif
}

void requestPermissions()
{
#ifdef Q_OS_ANDROID
    QJniObject activity = QNativeInterface::QAndroidApplication::context();
    QJniEnvironment env;

    QStringList permissions = {
        "android.permission.READ_EXTERNAL_STORAGE",
        "android.permission.WRITE_EXTERNAL_STORAGE",
        "android.permission.MANAGE_EXTERNAL_STORAGE"
    };

    jclass stringClass = env->FindClass("java/lang/String");
    jobjectArray jPermissions = env->NewObjectArray(permissions.size(), stringClass, nullptr);

    for (int i = 0; i < permissions.size(); ++i) {
        QJniObject jstr = QJniObject::fromString(permissions[i]);
        env->SetObjectArrayElement(jPermissions, i, jstr.object<jstring>());
    }

    QJniObject::callStaticMethod<void>(
        "androidx/core/app/ActivityCompat",
        "requestPermissions",
        "(Landroid/app/Activity;[Ljava/lang/String;I)V",
        activity.object<jobject>(),
        jPermissions,
        1
        );
#endif
}

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In addition, in the android emulator, I go to settings->Apps->[my applicatioin]->Permissions files and media->Files and Media and selected Allow management of all files.

So, what can I do? Is there something that I am missing? Why can't I select those folders?

I have seen QCoreApplication::requestPermission() API, but there is no permission for storage.

Thank you in advance,

Carlos