code: public Observable<Page<DetectorDefinitionInner>> listSiteDetectorsNextAsync(final String nextPageLink) {
          return listSiteDetectorsNextWithServiceResponseAsync(nextPageLink)
              .map(new Func1<ServiceResponse<Page<DetectorDefinitionInner>>, Page<DetectorDefinitionInner>>() {
                  @Override
                  public Page<DetectorDefinitionInner> call(ServiceResponse<Page<DetectorDefinitionInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Get Detectors.
  Get Detectors.
  
  @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;DetectorDefinitionInner&gt; object