Android - Querying data from Firebase

Question

I have data in my Firebase realtime database that I want to query and show in my Recyclerview, but I am confused on how to do this.

Database Structure:

For one activity I want to query only the markers node. This seems easy to do with FirebaseUI

For another activity I want to query all routes and all markers. So each row in my recyclerview consist of: startDestination and endDestination of one route, the addresses and times of the markers connected to that route

Answer 1

Waitting for answers