@Override
  public Xobc_xodir_dir[] Get_dirs(Xoa_app app) {
    Ordered_hash hash = Ordered_hash_.New();

    // add default app dir
    String default_data_dir = context.getApplicationInfo().dataDir + "/";
    String selected =
        app.User()
            .User_db_mgr()
            .Cfg()
            .Get_app_str_or(Xobc_xodir_cfg.Key__selected_dir, default_data_dir);
    Xobc_xodir_dir itm =
        new Xobc_xodir_dir(
            String_.Eq(selected, default_data_dir), false, Bry_.new_u8(default_data_dir));
    hash.Add(default_data_dir, itm);

    // add "guessed" external dirs
    Sdcard_detection_strategy[] strategy_ary =
        new Sdcard_detection_strategy[] {
          new Strategy__storage_dir(-1),
          new Strategy__envvar__external_storage(-1),
          new Strategy__envvar__secondary_storage(
              -1) // NOTE: needed for BLU-STUDIO C 5+5 LTE; DATE: 2016-06-28
        };
    int len = strategy_ary.length;
    String root_rhs = Sdcard_detection_mgr.Get_root_rhs() + "/";
    for (int i = 0; i < len; ++i) {
      Sdcard_detection_strategy strategy = strategy_ary[i];
      String[] dir_strs = strategy.Get_dirs(context);
      for (String dir_str : dir_strs) {
        if (dir_str == null) continue;
        dir_str += root_rhs;
        if (hash.Has(dir_str)) continue;
        File dir = new File(dir_str);
        if (!dir.exists())
          continue; // dir doesn't exist; don't bother trying to create b/c permission won't be
                    // available at 4.4+
        if (!Sdcard_detection_mgr.Dir_is_writeable(dir)) continue;
        itm = new Xobc_xodir_dir(String_.Eq(selected, dir_str), false, Bry_.new_u8(dir_str));
        hash.Add(dir_str, itm);
      }
    }

    // add custom dir
    String custom =
        app.User()
            .User_db_mgr()
            .Cfg()
            .Get_app_str_or(Xobc_xodir_cfg.Key__custom_dir, "(choose your own folder)");
    itm = new Xobc_xodir_dir(String_.Eq(selected, custom), true, Bry_.new_u8(custom));
    hash.Add(custom, itm);
    return (Xobc_xodir_dir[]) hash.To_ary(Xobc_xodir_dir.class);
  }