Android 11-Mediastore播放列表从播放列表中删除多首曲目

问题描述

在Android 11上，当尝试从Playlist删除多条曲目时，所有曲目将被删除，而不仅仅是选定的曲目。在Android 10之前，它一直可以正常工作。
但是，如果仅删除1条轨道，则不会删除其他轨道。这是Android 11以来的错误或预期行为吗？这是scoped storage的副作用吗？
经过测试：Pixel 3,Android 11 Official release build

 public void removeTracksFromPlaylist(long playlistId,String[] ids) {
        Log.d(TAG,"removeTracksFromPlaylist() called with: playlistId = [" + playlistId + "],ids = [" + Arrays.toString(ids) + "]");
        Uri uri = MediaStore.Audio.Playlists.Members.getContentUri(MediaStore.VOLUME_EXTERNAL,playlistId);
        StringBuilder stringBuilder = new StringBuilder();
        for (int index = 0; index < ids.length; index++) {
            if (index > 0) {
                stringBuilder.append(",");
            }
            stringBuilder.append("?");
        }
        String selection = MediaStore.Audio.Playlists.Members._ID + " IN (" + stringBuilder.toString() + ")";
        contentResolver.delete(uri,selection,ids); // Returns count of all files removed from playlist
    }

修改： 来自来源的一些信息：（https://android.googlesource.com/platform/packages/providers/MediaProvider/+blame/refs/tags/android-11.0.0_r3/src/com/android/providers/media/MediaProvider.java#5610）

从源头上看，如果播放列表项的数量大于1，则会清除整个播放列表。

try (Cursor c = qb.query(helper,new String[] { Playlists.Members.PLAY_ORDER },queryArgs,null)) {
            if ((c.getCount() == 1) && c.moveToFirst()) {  // This condition fails if more than 1 item to delete
                return c.getInt(0) - 1;
            } else {
                return -1;
            }
}
 

此处使用索引来清除播放列表：（https://android.googlesource.com/platform/packages/providers/MediaProvider/+blame/refs/tags/android-11.0.0_r3/src/com/android/providers/media/MediaProvider.java#5566）

 private int removePlaylistMembers(@NonNull Uri playlistUri,@NonNull Bundle queryArgs)
            throws FallbackException {
        final int index = resolvePlaylistIndex(playlistUri,queryArgs);
        try {
            final File playlistFile = queryForDataFile(playlistUri,null);
            final Playlist playlist = new Playlist();
            playlist.read(playlistFile);
            final int count;
            if (index == -1) {      
                count = playlist.asList().size();
                playlist.clear();  //Clears whole playlist
            } else {
                count = 1;
                playlist.remove(index);
            }
            playlist.write(playlistFile);
            resolvePlaylistMembers(playlistUri);
            return count;
        } catch (IOException e) {
            throw new FallbackException("Failed to update playlist",e,android.os.Build.VERSION_CODES.R);
        }
    }

解决方法

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