Android - How to retrieve list of objects in their insertion order from Firebase?

Question

What do I want?

I want to retrieve the list of objects in their insertion order from Firebase Database.

How am I adding the object

Answer 1

Here is an example to illustrate Mr. Dima Rostopira response more clearly. Do you see the "orderByKey()"?

mFireBaseRefnew.orderByKey().addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        final Map messageMap = new LinkedHashMap();
        if (dataSnapshot != null && dataSnapshot.getValue() != null) {

            for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
                HashMap messageMap = (HashMap) postSnapshot.getValue();
                Collection messageItems = messageMap.values() ;
                List messageItemList = new ArrayList();
                messageItemList.addAll(messageItems);                     
        }
    }

    @Override
    public void onCancelled(FirebaseError firebaseError) {

    }
});