Firebase Realtime Database retrieving data issue

Question

I'm using Firebase Realtime Database for storing and retrieving data for my Android application. On my home screen I have implemented addListenerForSingleValueEvent for reading from my database.My database has one value for example :

 "version" : 455

After listening from my leaf "version" i retrieve value "455" in my app correctly. Now i perform two steps :

Kill the app.

Manually update leaf from firebase console to 467.

After that when i launch the app i get the same old value "455" for the first time , on second launch i get the updated value "467".

Is this proper behaviour for firebase database ? Is there anyway i can get updated value from the first app launch ?

EDIT : Adding Code

  FirebaseDatabase database = FirebaseDatabase.getInstance();
  DatabaseReference ref= database.getReference();
  database.setPersistenceEnabled(true);
  ref.keepSynced(true);
  ref.addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot) {
        if (dataSnapshot != null) {
          long version = (long) dataSnapshot.child("version").getValue();
          // This is the value which doesn't update for the first time.
        }
    }
    @Override
    public void onCancelled(DatabaseError databaseError) {

    }
  });

P.S. : I have used ref.keepSynced(true); , still for the first time after updating manually gives the old value.

@AndréKool : Edited it , persistanceEnabled and keepSynced(true) doesn't have any effect on the outcome. — Anonymous, Apr 04 '18 at 12:58
@ShubhamSrivastava Your code is correct. Have you tried to comment `keepsynced(true)`? What is the behaviour? — Alex Mamo, Apr 04 '18 at 13:11

score 1 · Accepted Answer · edited Apr 04 '18 at 13:37

1

Seeing your code I can say that contains no error. To solve the problem, just comment the following line of code:

database.setPersistenceEnabled(true);
ref.keepSynced(true);

And your problem will be solved. Your data will be displayed for the fist time.

edited Apr 04 '18 at 13:37

Frank van Puffelen

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answered Apr 04 '18 at 13:27

Alex Mamo

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Just accepted your edit suggestion. It's ok now? – Alex Mamo Apr 04 '18 at 13:35
Yeah fine now :) – Anonymous Apr 04 '18 at 13:45
not working for me i have try it – Shakeel Ahmed Sep 03 '19 at 09:45
@ShakeelAhmed Please post a fresh new question using its own [MCVE](https://stackoverflow.com/help/mcve), so me and other Firebase developers can help you. – Alex Mamo Sep 03 '19 at 09:46

Firebase Realtime Database retrieving data issue

1 Answers1