code: public static <OutT, InT> PagedList<OutT> toPagedList(List<InT> list, final Func1<InT, OutT> mapper) {
          PageImpl<InT> page = new PageImpl<>();
          page.setItems(list);
          page.setNextPageLink(null);
          PagedList<InT> pagedList = new PagedList<InT>(page) {
              @Override
              public Page<InT> nextPage(String nextPageLink) {
                  return null;
              }
          };
          PagedListConverter<InT, OutT> converter = new PagedListConverter<InT, OutT>() {
              @Override
              public Observable<OutT> typeConvertAsync(InT inner) {
                  return Observable.just(mapper.call(inner));
              }
          };
          return converter.convert(pagedList);
      }
docs: Converts the given list of a type to paged list of a different type.
  
  @param list the list to convert to paged list
  @param mapper the mapper to map type in input list to output list
  @param <OutT> the type of items in output paged list
  @param <InT> the type of items in input paged list
  @return the paged list