CODEWITHSUNDEEP
javaandroidfirebasefirebase-realtime-databaselistener
BryceSoker
BryceSoker

Reputation: 644

Android Firebase OnDataChange not getting triggered

So I'm trying to create a listener that will advertise the activity when a new entry is added to my database in Firebase like this: 

public void dataListener() {
    Query lastQuery = mDatabase.child("id").orderByKey().limitToLast(1);
    lastQuery.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            Log.d("ChildAdded",dataSnapshot.getChildren().toString());
            getAddedUpdates(dataSnapshot);
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {
            Log.d("ChildError",databaseError.toString());
        }
    });

I'm calling this dataListeneronCreate but nothing happens, and by that I mean, when I added a new entry on another phone this isn't triggered, even thought the data is being inserted (when i reload the app using a singleEeventListener in another method the data is received)

enter image description here

All fields are Text (Strings)

Upvotes: 0

Views: 710

Answers (1)

Peter Haddad
Peter Haddad

Reputation: 80952

The location is wrong, you need to change this:

Query lastQuery = mDatabase.child("id").orderByKey().limitToLast(1);

into this:

 DatabaseReference ref=FirebaseDatabase.getInstance().getReference();
 Query lastQuery=ref.orderByKey().limitToLast(1);

the snapshot is at the root node then you will be able to order the keys and retrieve the last one.

The child("id") does not have any key under it, example:

id
 pushid
   name: peter

The child'("id") is equal to a randomid then you can do this:

Query lastQuery=ref.orderByChild("id").equalTo(key_here)

Upvotes: 1

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