code: public String getDefaultSyncExpression() {
          String syncExpression = "";
          for (int i = 0; i < syncedActivityIds.length; i++) {
              if (i > 0)
                  syncExpression += " && ";
              syncExpression += syncedActivityIds[i];
          }
          return syncExpression;
      }
docs: Create the default sync expression based on the synced activity logical IDs.
  @param syncedActivityNames
  @return the default sync expression