CODEWITHSUNDEEP
javaandroidfirebasegoogle-cloud-platformgoogle-cloud-firestore
bramasta vikana
bramasta vikana

Reputation: 304

I want to order my data from newest to oldest using Cloud Firestore in Android using Java

I want to sort my data from oldest to newest from Cloud Firestore this is my code:

  private void loadNotesList() {
    firestoreDB.collection("keluhan")
            .get()
            .addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
                @Override
                public void onComplete(@NonNull Task<QuerySnapshot> task) {
                    if (task.isSuccessful()) {
                        List<keluhanModel> notesList = new ArrayList<>();

                        for (DocumentSnapshot doc : task.getResult()) {
                            keluhanModel note = doc.toObject(keluhanModel.class);
                            note.setId(doc.getId());
                            notesList.add(note);
                        }

                        mAdapter = new adapterKeluhan(notesList, getApplicationContext(), firestoreDB);
                        RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
                        recyclerView.setLayoutManager(mLayoutManager);
                        recyclerView.setItemAnimator(new DefaultItemAnimator());
                        recyclerView.setAdapter(mAdapter);
                    } else {
                        Log.d(TAG, "Error getting documents: ", task.getException());
                    }
                }
            });
}

I have tried to use .orderBy("date", Query.Direction.ASCENDING) but it didn't do anything it just a white page in my Android application.

This is my database:

screenshot database

Upvotes: 0

Views: 784

Answers (1)

Alex Mamo
Alex Mamo

Reputation: 138824

To be able to order your results by date, you should use the following query:

FirebaseFirestore rootRef = FirebaseFirestore.getInstance();
CollectionReference keluhanRef = rootRef.collection("keluhan");
Query dateQuery = keluhanRef.orderBy("timeStamp", Direction.ASCENDING);
dateQuery.get().addOnCompleteListener(/* ... */);

Calling:

.orderBy("date", Query.Direction.ASCENDING)

Will never work since your property name is timeStamp and not date.

Upvotes: 1

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