Creation of new message for Fanbib

message.java

 private void createNewMessage(String message) {
        String chatId = getIntent().getStringExtra("channelId");
        String loggedInUserId = Preferences.get(context, Preferences.KEY_USER_ID);
        String loggedInUserName = ""; // TODO : get user name


        DatabaseReference reference = FirebaseDatabase
                .getInstance()
                .getReference("/chatMessages/" + chatId + "/messages");

        long currentTime = System.currentTimeMillis();

        Map<String, Object> value = new HashMap<>();
        value.put("author", loggedInUserId);
        value.put("messageText", message);
        value.put("messageType", "text");
        value.put("time", currentTime);
        reference.push().setValue(value);


        FirebaseDatabase.getInstance().getReference("/chatroomUsers/" + chatId).get()
                .addOnSuccessListener(new OnSuccessListener<DataSnapshot>() {
                    @Override
                    public void onSuccess(DataSnapshot dataSnapshot) {

                        Map<String, Object> valueMap = (Map<String, Object>) dataSnapshot.getValue();

                        Iterator<String> keys = valueMap.keySet().iterator();

                        Map<String, Object> value = new HashMap<>();
                        value.put("lastMessage", message);

                        Map<String, Object> messageBy = new HashMap<>();
                        messageBy.put("name", loggedInUserName);
                        messageBy.put("userId", Preferences.get(context, Preferences.KEY_USER_ID));


                        value.put("lastMessageBy", messageBy);
                        value.put("lastMessageTime", currentTime);


                        for (Iterator<String> it = keys; it.hasNext(); ) {
                            String userId = it.next();

                            String refPath = "/userChatRooms/" + userId + "/" + chatId;

                            String otherUserName = getIntent().getStringExtra("username");

                            Map<String, Object> copyValue = new HashMap<String, Object>(value);

                            if (userId.equals(loggedInUserId)) {
                                // for the logged in user id set title as the other user id
                                copyValue.put("title", otherUserName);
                            } else {
                                // for non logged in user id use the user id of the logged in user
                                copyValue.put("title", loggedInUserName);
                            }

                            FirebaseDatabase
                                    .getInstance()
                                    .getReference(refPath)
                                    .setValue(copyValue);
                        }
                    }
                });
    }