clientCompletedRegistrationValueEventListener.java

clientCompletedRegistrationValueEventListener = new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot dataSnapshot) {
                for (DataSnapshot emailSnapshot : dataSnapshot.getChildren()) {
                    Log.d("Adding",emailSnapshot.getValue().toString()+" to emailAddressList");
                    emailAddressList.add(emailSnapshot.getValue().toString());
                    Log.d("in onDataChange","emailAddressList is:"+Arrays.toString(emailAddressList.toArray()));
                }
            }