code: public Observable<Page<ImageInner>> listAsync() {
          return listWithServiceResponseAsync()
              .map(new Func1<ServiceResponse<Page<ImageInner>>, Page<ImageInner>>() {
                  @Override
                  public Page<ImageInner> call(ServiceResponse<Page<ImageInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets the list of Images in the subscription. Use nextLink property in the response to get the next page of Images. Do this till nextLink is null to fetch all the Images.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;ImageInner&gt; object