Raj
Raj

Reputation: 13

Firebase query for single value update

How to add listener for a single value change on Firebase database. I tried below code but it listen on every value change.

 mFirebaseDatabase.child("url").addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot){
            }
        }

Upvotes: 1

Views: 479

Answers (2)

Alex Mamo
Alex Mamo

Reputation: 138969

You need to use addListenerForSingleValueEvent() method, like in the following lines of code:

mFirebaseDatabase.child("url").addListenerForSingleValueEvent(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot dataSnapshot){
        //Get desired data from dataSnapshot object
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
        Log.d(TAG, databaseError.getMessage()); //Don't ignore errors!
    }
}

Upvotes: 2

Prince Patel
Prince Patel

Reputation: 77

Query query = FirebaseDatabase.getInstance().getReferenceFromUrl(<url>);
    query.addListenerForSingleValueEvent(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {

        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

Hope it help

Upvotes: 0

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