code: public Observable<Page<StorageAccountInner>> listByResourceGroupAsync(String resourceGroupName) {
          return listByResourceGroupWithServiceResponseAsync(resourceGroupName).map(new Func1<ServiceResponse<List<StorageAccountInner>>, Page<StorageAccountInner>>() {
              @Override
              public Page<StorageAccountInner> call(ServiceResponse<List<StorageAccountInner>> response) {
                  PageImpl<StorageAccountInner> page = new PageImpl<>();
                  page.setItems(response.body());
                  return page;
              }
          });
      }
docs: Lists all the storage accounts available under the given resource group. Note that storage keys are not returned; use the ListKeys operation for this.
  
  @param resourceGroupName The name of the resource group within the user's subscription. The name is case insensitive.
  @return the observable to the List&lt;StorageAccountInner&gt; object