How to add newly added data from firebase to the top of the recyclerview and not at the bottom? Please see details

Question

I'm developing an app in which I'm retrieving some data from Firebase database.

The problem is that everytime I save something, it gets retrieved and gets added to the bottom of the RecyclerView.

What I want is I want the newly added data to get added to the top of the recyclerview and not at the bottom.

I have no idea how to do what I want to do.

Please let me know.

score 5 · Accepted Answer · answered Jun 25 '16 at 06:35

5

well first of all the question is about recyclerview and you posted code of your data retrieval. and if your want to add a new item to recycler view use

mArrayList.add(position, item);
notifyItemInserted(position);

for data to be inserted in first row use

mArrayList.add(0, item);
notifyItemInserted(0);

and then you can use mRecyclerView.smoothScrollToPosition(0); to scroll to the top.

answered Jun 25 '16 at 06:35

M.Waqas Pervez

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awesome. this did the job! can you please have a look at this too: http://stackoverflow.com/questions/38023511/how-to-place-ads-randomly-in-between-of-recyclerview-please-see-details Please?... – Hammad Nasir Jun 25 '16 at 06:43

score 3 · Answer 2 · answered Jun 25 '16 at 06:37

try something like

Query lastToFirstQuery = databaseReference.orderBy("something_in_your_database").limitToLast(datasnapshot.numChildren());

lastToFirstQuery.addChildEventListener(new ChildEventListener() { 
        @Override 
        public void onChildAdded(DataSnapshot dataSnapshot, String s) {
            Map<String, String> newRequest = (Map<String, String>) dataSnapshot.getValue();
            imageUID = newRequest.get("imageUIDh");
            hDescription = newRequest.get("hDescription");
            currentLat = newRequest.get("currentLat");
            currentLng = newRequest.get("currentLng");
            postedBy = newRequest.get("postedBy");
            postedAtTime = newRequest.get("postedAtTime");
            postedOnDate = newRequest.get("postedOnDate");
            utcFormatDateTime = newRequest.get("utcFormatDateTime");

        } 

        @Override 
        public void onChildChanged(DataSnapshot dataSnapshot, String s) {

        } 

        @Override 
        public void onChildRemoved(DataSnapshot dataSnapshot) {

        } 

        @Override 
        public void onChildMoved(DataSnapshot dataSnapshot, String s) {

        } 

        @Override 
        public void onCancelled(DatabaseError databaseError) {
            Snackbar snackbar = Snackbar
                    .make(coordinatorLayout, databaseError.getMessage(), Snackbar.LENGTH_LONG);
            snackbar.setDuration(Snackbar.LENGTH_SHORT);
            snackbar.show();
            progressBarLoading.setVisibility(View.INVISIBLE);
        } 
    });

M. Waqas answer solved the issue. Thanks for your answer too. Can you please have a look at this too: stackoverflow.com/questions/38023511/… Please?.. — Hammad Nasir, Jun 25 '16 at 06:43

How to add newly added data from firebase to the top of the recyclerview and not at the bottom? Please see details

2 Answers2