CODEWITHSUNDEEP
androidweb-servicesfirebasefirebase-realtime-database
AnonymousAlias
AnonymousAlias

Reputation: 1399

Checking if field data changed rather than any field in child data

I can check if any data that is a child of my reference has changed no problem but I cant find a way to check if a certain field has changed within that child.

Here is some code the .child("job") does not work as job is the field. It was just somethin I was trying.

 Firebase ref = new Firebase(Config.FIREBASE_URL);

        //adding a value event listener so if data in database changes it does in textview also not needed at the minute
        ref.child("Driver").child("Driver2").child("job").addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(DataSnapshot snapshot) {

                for (DataSnapshot postSnapshot : snapshot.getChildren()) {


                    Toast.makeText(ProfileActivity.this, "YEAAA ", Toast.LENGTH_SHORT).show();

                }

            }

            /************had to implement this method****************/
            @Override
            public void onCancelled(FirebaseError firebaseError) {
                System.out.println("The read failed: " + firebaseError.getMessage());

            }
        });

here is the json from the database

  "Driver" : {
    "Driver1" : {
      "job" : "none",
      "lat" : 53.4013419,
      "lon" : -111.803055,
      "name" : "JOHNNY"
    },
    "Driver2" : {
      "job" : "job",
      "lat" : 53.4012956,
      "lon" : -6.4091191,
      "name" : "MICK"
    },
    "Driver3" : {
      "job" : "cccc",
      "lat" : 45.815399,
      "lon" : 15.966568,
      "name" : "Boris"
    }
  }

I want to check if the job field changes, as the coordinates fields will be constantly changing anyway.

Upvotes: 5

Views: 3380

Answers (1)

Alex Mamo
Alex Mamo

Reputation: 138814

You are using correctly addValueEventListener() on the reference but you don't need that for loop. Your DataSnapshot is already on the job child, in which the key is job and the value is: none. So you need to remove the iteration. Hope it helps.

Upvotes: 7

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