Firebase value event listener not working

Question

In my app, I have an id that is supposed to be pulled down from firebase real time database. If I pull it down and it sees there is not an id available, then it sets the id

Answer 1

you need to set id = 1 into firebase database using setValue(), try below line of code it might help you

   userRef.child("id").

  addSingleValueEventListener(new ValueEventListener() {
@Override public void onDataChange (DataSnapshot dataSnapshot){
    try {
        String value = dataSnapshot.getValue().toString();
        id = Integer.parseInt(value);
    } catch (NullPointerException e) {
         // if id=0 then set id=1 using setvalue()
        // this will set value of Id =1 in firebase database 
             id=1;                 
        userRef.child("id").setValue(id);
        log.d(LOG_TAG, e.printStackTrace());
    }
}

@Override public void onCancelled (DatabaseError databaseError){
            id=1;
          userRef.child("id").setValue(id);
   }
});