how to reverse array list

gistfile1.txt

 .addSnapshotListener(new EventListener<QuerySnapshot>() {
                    @Override
                    public void onEvent(@Nullable QuerySnapshot value,
                                        @Nullable FirebaseFirestoreException e) {
                        if (e!= null){
                            Log.w(TAG, "listen failed "+e);
                            return;
                        }
                        List<MessageModel> messageList = new ArrayList<>();
                        for (DocumentSnapshot doc : value){
                            String message = doc.getString("msg");
                            String time = doc.getString("tme");
                            String id = doc.getString("id");
                            Log.i(TAG,"loaded "+message);
                            messageList.add(new MessageModel(message, time, id));
                        }
                        Collections.reverse(messageList);
                        mMessageListLive.setValue(messageList);

                    }
                });