Firebase Data Desc Sorting in Android

Question

I am storing data in Firebase storage.

Object Comment with attribute timestamp. When I push data from device to Firebase I\'m populating

Answer 1

Based on Himanshus answer but Im using kotlin and instead of the timestamp in the question Im ordering by score which should be similar. I'm not sure if firebase has an ascending or descending function but this is what ended working for me in my current project. I hope it will help someone else in the near future.

FirebaseFirestore.getInstance().collection("leaderboard")
            .orderBy("score")
            .addSnapshotListener { snapshot, exception ->

                if (exception != null) {
                    Log.e("Exception:", "Could not retrieve scores ${exception.localizedMessage}")
                }

                if (snapshot != null) {
                    scores.clear()

                    for (document in snapshot.documents) {
                        val data = document.data

                        val name = data?.get("name") as? String
                        val score = data?.get("score") as? Number

                        val documentId = document.id

                        val newScore = Score(name, score, documentId)
                        scores.add(newScore)
                    }

                    scores.reverse()
                    scoresAdapter.notifyDataSetChanged()
                }
            }

This is what worked for me. Happy coding!