CODEWITHSUNDEEP
javaandroidfirebasegoogle-cloud-firestore
Pradeep Sheoran
Pradeep Sheoran

Reputation: 493

How to automatically detect new document in collection of Firebase Firestore?

I want to make an Android chat application. So I want to know how to get data from Firebase Firestore automatically, when new document create? Actually I do not wanna use add snapshot listener because of its give real-time data changes of a single document but want to find out real time updated Firebase Firestore document. Please suggest me.

Upvotes: 3

Views: 4841

Answers (3)

Tablesalt
Tablesalt

Reputation: 21

I don't know if you can do it with firestore but with realtime database you can use the .on(). If the rest of your app is using firestore, each project can use both a cloud firestore and a realtime database. The docs are really simple.

Upvotes: 1

Alex Mamo
Alex Mamo

Reputation: 139019

To solve this, I recommend you to use CollectionReference's get() method. This is the correspondent addListenerForSingleValueEvent() method from Firebase real-time database.

Executes the query and returns the results as a QuerySnapshot.

If you want to use Firebase-UI library, this is a recommended way in which you can retrieve data from a Cloud Firestore database and display it in a RecyclerView using FirestoreRecyclerAdapter.

Upvotes: 4

Thelouras
Thelouras

Reputation: 880

I don't know if you can do this without a snapshot listener. Check this code, if it is what you want.

private void addRealtimeUpdate() {
    DocumentReference contactListener=db.collection("PhoneBook").document("Contacts");
    contactListener.addSnapshotListener(new EventListener < DocumentSnapshot > () {
    @Override
    public void onEvent(DocumentSnapshot documentSnapshot, 
        FirebaseFirestoreException e) {
         if (e != null) {
            Log.d("ERROR", e.getMessage());
            return;
         }
         if (documentSnapshot != null && documentSnapshot.exists()) {
            Toast.makeText(MainActivity.this, "Current data:" + 
          documentSnapshot.getData(), Toast.LENGTH_SHORT).show();
        }
     }
    });
  }

Upvotes: 6

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