Get child names in Firebase

Question

{
  "items" : {
    "Chemistry" : {
      "-KiUOPW8TR_QcEeDbrAy" : {
        "answer" : "ssssss",
        "id" : "1",
        "question" : "sss"
      }
    },
    "Countries" : {
      "-KiUR2ilBYN5LJU6uOCf" : {
        "answer" : "ffffff",
        "id" : "1",
        "question" : "fffff"
      }
    },
    "Film" : {
      "-KiUOr7GbPhV_perbHt4" : {
        "answer" : "dddd",
        "id" : "1",
        "question" : "dd"
      }
    }
}

From the above data, I want to get only child names of items.

Eg. I want to get these names

Chemistry 
Countries 
Film

How can I do that?

Possible duplicate of [How to get the key from the value in firebase](http://stackoverflow.com/questions/38232140/how-to-get-the-key-from-the-value-in-firebase) — Selvin, Apr 24 '17 at 11:24
Please also add the *firebase-database* tag to your question. Thanks man! — Paulo Mattos, Apr 24 '17 at 11:28

Alex Mamo · Accepted Answer · 2020-09-08T18:53:29.333

9

To get those names, please use this code:

DatabaseReference itemsRef = FirebaseDatabase.getInstance().getReference().child("items");
ValueEventListener eventListener = new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        for(DataSnapshot ds : dataSnapshot.getChildren()) {
            String name = ds.getKey();  
        }
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        Log.d("TAG", databaseError.getMessage()); //Don't ignore potential errors!
    }
};
itemsRef.addListenerForSingleValueEvent(eventListener);

edited Sep 08 '20 at 18:53

answered Apr 24 '17 at 11:19

Alex Mamo

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You don't need to cast the key to `String`. – Paulo Mattos Apr 24 '17 at 11:26
BTW, looks like you accidentally deleted your `ref` variable. – Paulo Mattos Apr 24 '17 at 11:30
not working..I used childListener and works now..Thanks – Ashique bzq Apr 24 '17 at 16:58

Get child names in Firebase

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