Crash on selecting flash image on android

[iczero]

When selecting the flash image in the kits menu on android, the app crashes. This seems to only happen with version 1.5, which introduced the storage access framework file picker.

The error message (from logcat):

05-21 18:27:56.341 15994 16028 F rg.firebird.em: java_vm_ext.cc:570] JNI DETECTED ERROR IN APPLICATION: JNI GetMethodID called with pending exception java.lang.SecurityException: No persistable permission grants found for UID 10348 and Uri content://com.android.externalstorage.documents/document/primary:firebird/cx cas/flash.img [user 0]

A brief search found (https://stackoverflow.com/questions/25414352/how-to-persist-permission-in-android-api-19-kitkat/29588566#29588566). The flag Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION seems to be missing when the file chooser is launched.

[Vogtinator]

I don't get that here on Android 6.0, which version do you run?

Unfortunately this is done in Qt code, so it would have to be fixed there.

Why oh why is the Android API so unbelievably awful...

[iczero]

I am on Android 10, though it might have something to do with vendor customizations.

I dug through the logs a bit more and it seems to be coming from ContentResolver.takePersistableUriPermission:

05-22 00:30:14.301 28013 28051 F rg.firebird.em: runtime.cc:638] No pending exception expected: java.lang.SecurityException: No persistable permission grants found for UID 1010350 and Uri content://com.android.externalstorage.documents/document/primary:firebird/cx cas/flash.img [user 0]
05-22 00:30:14.301 28013 28051 F rg.firebird.em: runtime.cc:638]   at java.lang.Exception android.os.Parcel.createException(int, java.lang.String) (Parcel.java:2071)
05-22 00:30:14.301 28013 28051 F rg.firebird.em: runtime.cc:638]   at void android.os.Parcel.readException(int, java.lang.String) (Parcel.java:2039)
05-22 00:30:14.301 28013 28051 F rg.firebird.em: runtime.cc:638]   at void android.os.Parcel.readException() (Parcel.java:1987)
05-22 00:30:14.301 28013 28051 F rg.firebird.em: runtime.cc:638]   at void android.app.IUriGrantsManager$Stub$Proxy.takePersistableUriPermission(android.net.Uri, int, java.lang.String, int) (IUriGrantsManager.java:280)
05-22 00:30:14.301 28013 28051 F rg.firebird.em: runtime.cc:638]   at void android.content.ContentResolver.takePersistableUriPermission(android.net.Uri, int) (ContentResolver.java:2474)
05-22 00:30:14.301 28013 28051 F rg.firebird.em: runtime.cc:638]   at void org.qtproject.qt5.android.QtNative.startQtApplication() (QtNative.java:-2)

I think it could possibly be fixed by manually invoking the file chooser dialog using JNI, but I'm not exactly familiar with any of that. I tried finding where the file picker is actually launched but it seems that is done with the FileDialog qml component.

Hope this helps.

[Vogtinator]

The code is here: https://code.qt.io/cgit/qt/qtbase.git/tree/src/plugins/platforms/android/qandroidplatformfiledialoghelper.cpp?h=v5.15.0-rc2#n172

[JeffLeeBYD]

I solved this problem by deleting all spaces of folder name where you store flash. "Nspire EMU" does not work, but "nspire" works. Hope this will help you.

[Vogtinator]

Can you try whether https://owncloud.ritter-vogt.de/index.php/s/DO5h08BKxGvl5du (b1d2b49) works for you?

[iczero]

@Vogtinator it works! Tried with the same path as last time, but I'm now on android 11.

[Vogtinator]

Great!