public SoundActivityFragmentHolder(int index)
 {
     if (index != -1)
     {
         folder = FolderStorage.GetInstance()[index];
     }
 }
 public FolderListFragmentAdapter(Context context)
 {
     li      = LayoutInflater.From(context);
     cont    = context;
     folders = FolderStorage.GetInstance();
     folders.SetNotifier(NotifyItemChanged);
 }