class Song {
  final String id;
  final String title;
  final String artist;
  final String? url; // 以后放 content:// 或 https://

  Song({required this.id, required this.title, required this.artist, this.url});

  // 示例占位数据
  static List<Song> get placeholderSongs => [
        Song(id: '1', title: '晴天', artist: '周杰伦'),
        Song(id: '2', title: '起风了', artist: '买辣椒也用券'),
        Song(id: '3', title: 'Flower Dance', artist: 'DJ Okawari'),
        Song(id: '4', title: '夜曲', artist: '周杰伦'),
      ];
}