如何从多个json api获取数据

I have more than one json api ex: api1 ,api2 and api3 Each one of them has different structure from the others, I want to get data from these three api and combine them in one recycler view , i searched about these subject but couldn’t get any useful tutorial i am already using retrofit for fetch data from only one api , should i using rxjava withe retrofit to do what i want And how .I have more than one json api ex: api1 ,api2 an