Android:无限滚动与rx-java使用repeatWhen, takeUntil和filter with retrofit

I am using Retrofit 2.2 with RxJava. The pagination works like this: I get the first batch of data, I have to request the second batch of data with the same params except one which is the lastUpdated date and then if I get empty or the same batch of data it means there are no more items. I have found this great article I am using Retrofit 2.2 with RxJava. The pagina