从当前用户从Firebase数据库中检索数据

As mentioned in the title of this question, I'm trying to retrieve specific data from my firebase current user. In my android app I have a button called "view List" which creates a new fragment and inside the fragment I want to get the current user logged into firebase and get access to its saved location the user saved on the database. But I'm a bit confused on how to display all the saved locations from the database for the current user. I will post my code below and I will also post a screen shot of my current database on firebase.As mentioned in the title of this question, I'm