Show multiple item picker activities based on for each loop

?I have a query layer to return distinct values, "category 1", "category 2", etc. Then I am using a for each loop to iterate through each distinct value to do multiple queries. I would like to display each result of the query layer in its own item picker list so I organize them by the "category". I got as far as the for each loop, but since the number of categories is not fixed, I can't create the item picker ahead of time.