How to get value of parent node as string?

Question

So in the above data structure, I want to get value Aprilia Caponord 1200 (marked in fig.). I have Firebase reference to Aprilia (root nod

Answer 1

I met this case and solved the way as below:

final ChildEventListener countsListener = new ChildEventListener() { //for querying how many card created by each user in a specific period
            @Override
            public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
                /**
                 * $ROOT/Apirilia/Apirilia_id/CardId/IMG_URL
                 * $ROOT/Apirilia/Apirilia_id/CardId/PRICE
                 *                      ^[key] :[value]
                 */
                if (dataSnapshot == null) {
                    Logger.e("!!! dataSnapshot is null");
                    return;
                }
                String apirilia_id = dataSnapshot.getRef().getParent().getKey();
                Logger.d("... Apirilia_id:" + apirilia_id);
            }

            @Override
            public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {

            }

            @Override
            public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {

            }

            @Override
            public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {

            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {

            }
        };

I'm appreciated to be able to give one a hand.

Answer 2

You're probably looking for the getKey() method on DataSnapshot:

    mFirebaseRef = new Firebase("https://yours.firebaseio.com");
    mFirebaseRef.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot child: dataSnapshot.getChildren()) {
                Log.i("MainActivity", child.getKey());
            }
        }

        @Override
        public void onCancelled(FirebaseError firebaseError) {
            Log.e("MainActivity", "onCancelled", firebaseError.toException());
        }
    });

A few things to note here:

• I changed getChild() in your code to getChildren(), since there is not method getChild() that I'm aware of.
• You should consider using addChildEventListener, which gives you DataSnapshots on the lower-level nodes
• Things will get considerably easier if you create "wrapper classes" for your cars. The Firebase SDK for Android will then automagically unwrap the JSON into instances of that class. See our AndroidChat repo for a good example of this.

Answer 3

for those who looking for key in firebaseUi then this code will work for u:-

firebaseadapterinstance.getRef(position).getKey();