How to retrieve the key in Firebase using Iterator

Question

How to get the key in this json structure using Iterator? The logic would be, if the user is Harry Anderson, I want to search the value from person0 up to person6 and if the value is found i want to get its key which in this case is -KaSeO5n2xCl2sEnDpSi. I don't know if this will be achieved using Iterator, but if there are other ways to do this, please do suggest. Thanks.

Refer the links:- http://stackoverflow.com/questions/37094631/get-the-pushed-id-for-specific-value-in-firebase-android http://stackoverflow.com/questions/38232140/how-to-get-the-key-from-the-value-in-firebase — Nainal, Jan 16 '17 at 10:28
Thank you for the response but I could not find answers with the link. @Nainal — elbert rivas, Jan 16 '17 at 10:36

score 2 · Answer 1 · answered Jan 16 '17 at 10:45

 ref.child("chat/chat-participants").addListenerForSingleValueEvent(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                ArrayList<String> keyList = new ArrayList<>();
                for (DataSnapshot child : dataSnapshot.getChildren()) {
                    Log.e("!_@@_Key::>", child.getKey());
                        keyList.add( child.getKey());
                }
              // your all keys are store in KeyList ArrayList
            }

            @Override
            public void onCancelled(FirebaseError firebaseError) {
                Log.e("!_@@@_ERROR_>>", "onCancelled", firebaseError.toException());
            }
        });

score 0 · Answer 2 · answered Jan 16 '17 at 10:37

You can try

FirebaseDatabase database = FirebaseDatabase.getInstance();
DatabaseReference chatRef = database.getReference("chat").child("chat-participants");

chatRef.addListenerForSingleValueEvent(
                    new ValueEventListener() {
                        @Override
                        public void onDataChange(DataSnapshot dataSnapshot) {
    //do stuff iteration
    }});

I don't think there is an explicit method to do it

How to retrieve the key in Firebase using Iterator

2 Answers2