code: public Observable<ListContentKeysResponseInner> listContentKeysAsync(String resourceGroupName, String accountName, String streamingLocatorName) {
          return listContentKeysWithServiceResponseAsync(resourceGroupName, accountName, streamingLocatorName).map(new Func1<ServiceResponse<ListContentKeysResponseInner>, ListContentKeysResponseInner>() {
              @Override
              public ListContentKeysResponseInner call(ServiceResponse<ListContentKeysResponseInner> response) {
                  return response.body();
              }
          });
      }
docs: List Content Keys.
  List Content Keys used by this Streaming Locator.
  
  @param resourceGroupName The name of the resource group within the Azure subscription.
  @param accountName The Media Services account name.
  @param streamingLocatorName The Streaming Locator name.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ListContentKeysResponseInner object