code: public Observable<Page<NodeFile>> listFromTaskNextAsync(final String nextPageLink) {
          return listFromTaskNextWithServiceResponseAsync(nextPageLink)
                  .map(new Func1<ServiceResponseWithHeaders<Page<NodeFile>, FileListFromTaskHeaders>, Page<NodeFile>>() {
                      @Override
                      public Page<NodeFile> call(ServiceResponseWithHeaders<Page<NodeFile>, FileListFromTaskHeaders> response) {
                          return response.body();
                      }
                  });
      }
docs: Lists the files in a task's directory on its compute node.
  
  @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;NodeFile&gt; object