removeEventListener not removing listener in firebase

Question

I want to remove addValueEventListener listener from a firebase ref when value of particular field is true.

ValueEventListener valueListener=null;

private void removeListener(Firebase fb){
    if(valueListener!=null){
        **fb.removeEventListener(valueListener);**
    }
}

String key="https://boiling-heat-3083.firebaseio.com/baseNodeAttempt/" + userId+"/"+nodeType+"/"+nodeId+"/data";
final Firebase fb = new Firebase(key);
valueListener=fb.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot snap) {
        final HashMap<String, Object> data=(HashMap<String, Object>) snap.getValue();
        if( data.get("attemptFinish_"+nodeId)!=null){
            boolean title = (boolean) snap.child("attemptFinish_"+nodeId).getValue();
            if(title){
                removeListener(fb);
            }
        }
    }
    @Override
    public void onCancelled() {
        // TODO Auto-generated method stub
    }
});

But addValueEventListener is not getting removed and it's called for that firebase ref . So please suggest me how to remove listener from any firebase ref if required.

Answer 1

You can remove the listener from within the callback with:

ref.removeEventListener(this);

So a complete fragment:

String key="https://boiling-heat-3083.firebaseio.com/baseNodeAttempt/" + userId+"/"+nodeType+"/"+nodeId+"/data";
final Firebase ref = new Firebase(key);
ref.addValueEventListener(new ValueEventListener() {
    @Override
    public void onDataChange(DataSnapshot snap) {
        if (snap.hasChild("attemptFinish_"+nodeId) {
            boolean isFinished = (boolean) snap.child("attemptFinish_"+nodeId).getValue();
            if(isFinished){
                ref.removeEventListener(this);
            }
        }
    }
    @Override
    public void onCancelled() {
        // TODO Auto-generated method stub
    }
});

I removed the HashMap, instead using the methods of the DataSnapshot to accomplish the same. I also renamed a few variables to be clearer/more idiomatic.