CODEWITHSUNDEEP
javaandroidfirebase
mjl007
mjl007

Reputation: 775

How to listen for a single field in Firebase's Android SDK

I am trying to figure out a way to listen for a single item using the FireBase API's. So far I figured out how to query a single item using the orderByKey and equalTo functions.

I tried to do something similar for listening for a single value, but anytime I change one value it gives me the whole database items when I just want the one that was changed. I've added the valueEventListener and the childEventListener, but they seemed to do similar things.

Is there a way to listen for a single item and only return that single item?

Upvotes: 0

Views: 1327

Answers (1)

Chad Bingham
Chad Bingham

Reputation: 33846

If I understand you correctly, lets assume this is your Firebase setup summary:

 yourApp:
   "node": {
       "subNode1": {
          "value1": value,
          "value2": value,
          "subSubNode":{
              //....values....//
           },
       },
  "node2": { ... },
  "node3": { ... }
  //...and so on ..//
},

And you are trying to listen to value2? If that is the case, that is not possible. To access this, you need to listen to the parent node; subNode1, and onChildEvent, just get that value.

However, if you are trying to listen to subNode1 or even subSubNode, that is possible. By just providing the path to this object when creating the Firebase object.

If you post more code, I will modify this accordingly to better answer your question.

EDIT

Say you wanted to retrieve subSubNode. Create a Firebase reference to that and add a listener:

 Firebase firebase = new Firebase("yourFirebaseURL").child("node").child("subSubNode");
 firebase.addChildEventListener(new .....);

Upvotes: 1

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