MediaStore.Playlists.Members.moveItem的替代方案

Question

我一直在使用以下代码从我的Android应用程序的播放列表中删除一个项目：

private void removeFromPlaylist(long playlistId, int loc)
{
    ContentResolver resolver = getApplicationContext().getContentResolver();
    Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external", playlistId);
    resolver.delete(uri, MediaStore.Audio.Playlists.Members.PLAY_ORDER+" = "+loc, null);
    for(int i=loc+1;i<playSongIDs.length;i++) {
        MediaStore.Audio.Playlists.Members.moveItem(resolver,playlistId,i, i-1);
    }
}

我目前使用的是Android2.2库，这是我使用Android2.1需要更改的唯一内容。是否有其他方法可以从播放列表中删除项目，并在删除的项目之后调整项目的顺序？

Answer 1

看一下MediaStore的代码，我们得出了这个解决方案，似乎工作得很好：

/**
 * Convenience method to move a playlist item to a new location
 * @param res The content resolver to use
 * @param playlistId The numeric id of the playlist
 * @param from The position of the item to move
 * @param to The position to move the item to
 * @return true on success
 */
private boolean moveItem(ContentResolver res, long playlistId, int from, int to) {
    Uri uri = MediaStore.Audio.Playlists.Members.getContentUri("external",
            playlistId)
            .buildUpon()
            .appendEncodedPath(String.valueOf(from))
            .appendQueryParameter("move", "true")
            .build();
    ContentValues values = new ContentValues();
    values.put(MediaStore.Audio.Playlists.Members.PLAY_ORDER, to);
    return res.update(uri, values, null, null) != 0;
}