List Data in cloud firestore using Timestamp

Question

I am trying to list the data in Firestore by Timestamp but it can't happening. With the whereGreaterThan and OrderBy.

    db.collection("Users_Photos").document(uid).collection("ImageData").whereGreaterThan("image_timestamp",1506816000).orderBy("image_timestamp").addSnapshotListener(new EventListener<QuerySnapshot>() {
        @Override
        public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {

            if(e!=null)
            {

            }
         for (DocumentChange doc : documentSnapshots.getDocumentChanges())
         {
            if (doc.getType()==DocumentChange.Type.ADDED)
            {
                Photo photo = doc.getDocument().toObject(Photo.class);
                photosList.add(photo);
                photoListAdapter.notifyDataSetChanged();

 String name = doc.getDocument().getString("image_location");
              Log.d(TAG,name);
            }

         }

        }

    });

What does your data model look like? You are also only looking for documents that were recently added. — dazza5000, Feb 05 '18 at 14:58
I am showing it on the Recycler view and updating in realtime. — Dheeraj Rijhwani, Feb 05 '18 at 15:04

score 1 · Accepted Answer · answered Feb 05 '18 at 16:41

You are not getting your data sorted by timestamp, becasue you are not using the correct way of setting the data. As I see you are using the current time in millis instead of using server value timestamp. Here is how you can set the timestamp correctly in Cloud Firestore. So do as explained in that post, and your data will be sorted correctly.

List Data in cloud firestore using Timestamp

1 Answers1