I tracked down this issue while trying to use QDesktopServices::openUrl().

I solved it by implementing my own java Activity extended from QtActivity and reimplemented
openURL().

The original in openURL() in QtNative.java kicks me out here:

Uri uri = getUriWithValidPermission(context, url, "r");
if (uri == null) {
 Log.e(QtTAG, "openURL(): No permissions to open Uri");
 return false;
 }

Obiviously getUriWithValidPermission returns NULL for my url!