code: public Observable<Page<FileInner>> listOutputFilesNextAsync(final String nextPageLink) {
          return listOutputFilesNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<FileInner>>, Page<FileInner>>() {
                  @Override
                  public Page<FileInner> call(ServiceResponse<Page<FileInner>> response) {
                      return response.body();
                  }
              });
      }
docs: List all directories and files inside the given directory of the output directory (Only if the output directory is on Azure File Share or Azure Storage container).
  
  @param nextPageLink The NextLink from the previous successful call to List operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;FileInner&gt; object