[Android-development] QDesktopServices::openUrl in Qt 5.15

[Sandro Andrade]

Hi there,

With latest Android changes for user storage handling, I've noticed
that QDesktopServices::openUrl() now checks for Uri's with valid
permissions in Android.

My case is as follows:
1) I download a remote PDF file into the
QStandardPaths::writableLocation(QStandardPaths::DownloadLocation)
directory
2) Call QDesktopServices::openUrl() to view PDF file using some
Android system viewer

This worked fine in previous Qt for Android releases. With Qt 5.15 it
fails with a "openURL(): No permissions to open Uri" message,
generated by QtNative::openURL(), since no Uri permissions are found.

I tried to add Uri permissions like the ones presented in
https://codereview.qt-project.org/gitweb?p=qt%2Fqtbase.git;a=commit;h=dcb38e4bc74337d0d670bc30b8193cbd73f11599

I basically invoke a JNI method which does the following:

Uri uri = Uri.parse(fileName);
activity.getContentResolver().takePersistableUriPermission(uri,
Intent.FLAG_GRANT_READ_URI_PERMISSION |
Intent.FLAG_GRANT_WRITE_URI_PERMISSION);

But invoking takePersistableUriPermission fails with a:
java.lang.SecurityException: No persistable permission grants found
for UID 10632 and Uri
file:///emulated/0/Download/historico-escolar-parcial.pdf

I also tried to store the downloaded PDF file in
QStandardPaths::writableLocation(QStandardPaths::AppDataLocation) with
no success.

Any hints on how to properly grant Uri permissions for downloaded files?

Thanks in advance,
--
Sandro