i want to retrieve the keys into FirebaseListAdapter not the values like this example:
![screenshot_1](https://cloud.githubusercontent.com/assets/7766704/25784492/37e23300-336e-11e7-91f7-3dc1f8eaab10.png)

so i want to show "Cat" and "Dog" in the listview but i don't know how to do this cuz i searched a lot but found nothing.