问题
My app creates playlists in the android mediastore. All is well for api's including 28 however, api 29 seems to require additional permissions. Inserting a new playlist name and id works without issue. When it comes to inserting track id and play order, an access permission exception is thrown. In verifying the Uri, i found that when resolver.insert for API 29 the exception error is:
java.lang.SecurityException: myapp_name has no access to content://media/external_primary/audio/media/146
The code:
Uri exturi = MediaStore.Audio.Playlists.Members.getContentUri("external", playlist_id);
// exturi : content://media/external/audio/playlists/227/members
// values : audio_id=146 play_order=0
values.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, play_order);
values.put(MediaStore.Audio.Playlists.Members.AUDIO_ID, audio_id);
try {
resolver.insert(exturi, values);
} catch (Exception e) {
e.printStackTrace();
}
Strange thing is that although inserting a new playlist into Mediastore works but adding tracks (track_id, play order) gives an access permission error
How to resolve this exception error for API 29?
回答1:
I think this is an Android 10 bug, so I've filed a report here: https://issuetracker.google.com/issues/147619577 (includes instructions for an emulator test case to reproduce it if that interests you). Please consider starring it to let the Android team know that it affects you.
From what I can tell, it only affects files on 'external' storage, like sdcards mounted on /storage/XXXX-XXXX
In the meantime, the only fix that some of my users were able to successfully apply is to move their music files to the internal storage (reboot and wait for the media scan to finish to be sure that MediaStore is up-to-date).
回答2:
I think I understand a bit more. I have implemented the SAF so do not use scopedStorage and have access once the user accepts. The fact that I can insert new playlist entries clearly shows access to MediaStore, I can also delete these. However trying to add tracks to these playlists does not work for api29. Inserting/deleting a new playlist does not involve any files located on internal or external sdcards. Inserting tracks into playlists does however appear to need access to those original track, and fails or has no access to content://media/external_primary/audio/media/30, despite the SAF implementation.
the permissions for both internal and external sdcard:
2020-07-12 14:39:04.435 11858-11858/com.flyingdutchman.newplaylistmanager E/onCreate:: uriPermission: UriPermission {uri=content://com.android.externalstorage.documents/tree/17F5-240A%3A, modeFlags=3, persistedTime=1594551961263}
2020-07-12 14:39:04.435 11858-11858/com.flyingdutchman.newplaylistmanager E/onCreate:: uriPermission: UriPermission {uri=content://com.android.externalstorage.documents/tree/primary%3A, modeFlags=3, persistedTime=1594551926876}
The question now becomes
How do I ensure saf permissions are recognised by the resolver.insert method when inserting/modify tracks into the Media database
来源：https://stackoverflow.com/questions/57398381/api-29-mediastore-access