[Interest] Problems writing files to Android file system on some newer devices using QStandardPaths

Nuno Santos nuno.santos at imaginando.pt
Mon May 24 14:17:01 CEST 2021


Is anyone aware of changes to the way that Android filesystem works and how Qt interacts with it?

I’ve been writing to QStandardPaths::DocumentLocations without any issues until. However, on some newer devices, it fails to open files for writing. One example is Samsung Tab A (SM-T500)

It seems though that using android:requestLegacyExternalStorage=“true” seems to fix the problem but this solution will not last long because it seems it will be ignored when the app targets API 30 (Android 11):

https://developer.android.com/training/data-storage/use-cases <https://developer.android.com/training/data-storage/use-cases>

Caution: After you update your app to target Android 11 (API level 30), the system ignores the requestLegacyExternalStorage attribute <https://developer.android.com/about/versions/11/privacy/storage#scoped-storage> when your app is running on Android 11 devices, so your app must be ready to support scoped storage and to migrate app data <https://developer.android.com/training/data-storage/use-cases#migrate-legacy-storage> for users on those devices.

Is there any common knowledge about this? 




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