MediaStore.Audio.Playlists.Members.moveItem有时不工作

问题描述

我面临的一个问题，我不能由我自己处理，我从字面上检查code的每一行，但它仍然没有工作。

我的ListView拖动，从而重新presents播放列表（普通MediaStore.Audio.Playlist），并改变歌曲顺序下降监听器。

  listView.setDropListener（新DragSortListView.DropListener（）{
                @覆盖
                公共无效降（INT I，诠释I2）{
                    如果（playlistId！= -1）{
                        布尔移动= MediaStore.Audio.Playlists.Members.moveItem（getContentResolver（），playlistId，I，I 2）;
                        的System.out.println（项目移动+移动）;
                    }
                }
            }）;
 

我也有contentObserver，处理光标重装。

 私有类MyContentObserver扩展ContentObserver {
    MyContentObserver（处理程序处理）{
        超（处理）;
    }
    @覆盖
    公共布尔deliverSelfNotifications（）{
        返回true;
    }
    @覆盖
    公共无效的onChange（布尔selfChange，开放的URI）{
        super.onChange（selfChange）;
        的System.out.println（更新）;
    }
}
 

当然手柄注册

  getContentResolver（）registerContentObserver（Uri.parse（内容：//传媒），真的，contentObserver）。
 

但这里有一个问题 - 移动选项总是返回true，但歌曲顺序保持不变。 4.4.4用有时，索尼的平板电脑 - - 上2.3.6移动选项不能在所有的工作，在4.4.2一切正常。我也试过这code有同样的结果。

 公共静态最终布尔移动选项（Con​​tentResolver的资源，
                                     长playlistId，从int，int值）{
    URI URI = MediaStore.Audio.Playlists.Members.getContentUri（外部，
            playlistId）
            。建立在（）
            .appendEn codeDPATH（将String.valueOf（从））
            .appendQueryParameter（动，真）
            。建立（）;
    ContentValues​​值=新ContentValues​​（）;
    values​​.put（MediaStore.Audio.Playlists.Members.PLAY_ORDER，到）;
    返回res.update（URI，价值观，NULL，NULL）！= 0;
}
 

解决方案

 公共无效降（INT I，诠释I2）{
    如果（playlistId！= -1）{
        布尔移动= MediaStore.Audio.Playlists.Members.moveItem（getContentResolver（），playlistId，I，I 2）;
        的System.out.println（项目移动+移动）;        //扫描播放列表
        字符串的URL =文件：//+ Environment.getExternalStorageDirectory（）+/播放列表;
        URI URI = Uri.parse（URL）;
        。getActivity（）sendBroadcast（新意图（Intent.ACTION_MEDIA_SCANNER_SCAN_FILE，URI））;
    }
}
 

I faced a problem I can't handle by myself, I have checked literally every single line of code, but it's still not working.

I have draggable listView, which represents a playlist (ordinary MediaStore.Audio.Playlist) and drop listener for changing order of songs.

listView.setDropListener(new DragSortListView.DropListener() {
                @Override
                public void drop(int i, int i2) {
                    if(playlistId != -1) {
                        boolean moved = MediaStore.Audio.Playlists.Members.moveItem(getContentResolver(), playlistId, i, i2);
                        System.out.println("Item moved " + moved);
                    }
                }
            });

Also I have contentObserver, which handles cursor reloading.

private class MyContentObserver extends ContentObserver {
    MyContentObserver(Handler handler) {
        super(handler);
    }
    @Override
    public boolean deliverSelfNotifications() {
        return true;
    }
    @Override
    public void onChange(boolean selfChange,  Uri uri) {
        super.onChange(selfChange);
        System.out.println("Updated");
    }
}

Of course handle is registered

getContentResolver().registerContentObserver(Uri.parse("content://media"), true, contentObserver);

But here's a problem - moveItem always returns true, but order of songs remains same. On 2.3.6 moveItem doesn't work at all, on 4.4.2 - sometimes, on sony tablet with 4.4.4 - everything works well. I also tried this code with same result

public static final 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;
}

解决方案

public void drop(int i, int i2) {
    if(playlistId != -1) {
        boolean moved = MediaStore.Audio.Playlists.Members.moveItem(getContentResolver(), playlistId, i, i2);
        System.out.println("Item moved " + moved);

        // scan playlists
        String url = "file://" + Environment.getExternalStorageDirectory() + "/Playlists";
        Uri uri = Uri.parse(url);
        getActivity().sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
    }
}

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