android - Audio.Media.EXTERNAL_CONTENT_URI 列表在文件删除后不更新

Question

我正在为所有音乐文件查询 MediaStore.Audio.Media.EXTERNAL_CONTENT_URI。它工作得很好，但每当我想从我的 sdCard 中删除音乐文件时，列表不会更新。知道如何更新列表吗？

这是我获取音乐文件的代码:

    Cursor cursor;
    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";


    cursor = getActivity().getContentResolver().query(uri, {"*"}, selection, null, null);

    if (cursor != null) {
        if (cursor.moveToFirst()) {
            do {
                String songName = cursor
                        .getString(cursor
                                .getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));


                String path = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.DATA));


                String albumName = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ALBUM));
                int albumId = cursor
                        .getInt(cursor
                                .getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));

                songs.add(new SongItem(albumName, albumId, path, songname));

            } while (cursor.moveToNext());
        }
    }

Answer 1

新添加的文件被添加到游标中，被删除的文件实际上并不会被删除。

为此，我们需要检查文件是否可用。如果不可用，请使用内容提供程序从数据库中删除它

这就是我解决问题的方法:

        Uri files= MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;    
        Cursor cursor= managedQuery(files, STAR, null,null,null);
        cursor.moveToFirst();
        for(int r= 0; r<cursor.getCount(); r++, cursor.moveToNext()){
            int i = cursor.getInt(0);
         File file = new File(cur.getString(cur.getColumnIndex(MediaStore.Audio.Media.DATA)));

            if(file.exists()){
                // keep files if it is empty
                list.add("Keeping : " + cursor.getString(2) + " : id(" + i + ")");
            }else{
                // delete any play-lists with a data length of '0'
                Uri uri = ContentUris.withAppendedId(MediaStore.Audio.Playlists.EXTERNAL_CONTENT_URI, i);
                getContentResolver().delete(uri, null, null);
                list.add("Deleted : " + cursor.getString(2) + " : id(" + i + ")");
            }
        }       
        cursor.close();