how can update Recyclerview when posting a comment

how can update Recyclerview when posting a comment

I already finished the connect DB, the data can write into DB, but it cannot show me new comment when I writing new comment.

I don't know where has problem, has someone can help me?

this is my code in HomeFragment

 recyclerView = (RecyclerView) view.findViewById(R.id.recy_feed);
        recyclerView.setHasFixedSize(true);
        layoutManager = new LinearLayoutManager(getActivity());
        recyclerView.setLayoutManager(layoutManager);
        listNewFeedModel = new ArrayList<>();
        requestQueue = Volley.newRequestQueue(getActivity());
        getData();
        recyclerView.setOnScrollChangeListener(this);
        adapter = new NewFeedAdapter(listNewFeedModel, getActivity());
        recyclerView.setAdapter(adapter);

HomeFragment write the infomation into the DB

 private JsonArrayRequest getDataFromServer(int requestCount) {
        final ProgressDialog progressDialog = new ProgressDialog(getActivity());
        progressDialog.setMessage("Load...");
        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(FeedConfig.DATA_URL + requestCount,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        parseData(response);
                        progressDialog.dismiss();
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressDialog.dismiss();
                        Toast.makeText(getContext(), "No More Items Available", Toast.LENGTH_SHORT).show();
                    }
                });
        progressDialog.dismiss();
        return jsonArrayRequest;
    }

    private void getData() {
        requestQueue.add(getDataFromServer(requestCount));
        requestCount++;
    }

    private void parseData(JSONArray array) {
        for (int i = 0; i < array.length(); i++) {
            NewFeedModel newFeedModel = new NewFeedModel();
            JSONObject json = null;
            try {
                json = array.getJSONObject(i);
                Log.d("TAG_FeedGroupID", json.getString(FeedConfig.TAG_FeedGroupID));
                newFeedModel.setFeedPostImageURL(json.getString(FeedConfig.TAG_FeedPostPhoto));
                newFeedModel.setFeedPostName(json.getString(FeedConfig.TAG_FeedPostName));
                newFeedModel.setFeedGroupName(json.getString(FeedConfig.TAG_FeedGroupName));
                newFeedModel.setFeedInfo(json.getString(FeedConfig.TAG_FeedInfo));
                newFeedModel.setFeedimageURL(json.getString(FeedConfig.TAG_FeedMediaPhoto_URL));
                newFeedModel.setFeedTags(json.getString(FeedConfig.TAG_FeedTags));
                newFeedModel.setFeedGroupID(json.getString(FeedConfig.TAG_FeedGroupID));
                newFeedModel.setFeedID(json.getString(FeedConfig.TAG_FeedID));
                newFeedModel.setTotalComment(json.getString(FeedConfig.TAG_TotalComment));
            } catch (JSONException e) {
                e.printStackTrace();
            }
            listNewFeedModel.add(newFeedModel);
        }
        adapter.notifyDataSetChanged();
    }

this is my adapter code

public class NewFeedAdapter extends RecyclerView.Adapter<NewFeedAdapter.ViewHolder> {
    private ImageLoader imageLoader;
    private Context context;
    RequestManager glide;
    private final int MENU_ITEM_VIEW_TYPE = 0;
    private final int UNIFIED_NATIVE_AD_VIEW_TYPE = 1;
    List<NewFeedModel> newFeedModels;
    private String[] placeNames;
    ImageView pphoto;

    public NewFeedAdapter(List<NewFeedModel> newFeedModels, Context context){
        super();
        this.newFeedModels = newFeedModels;
        this.context = context;
        this.glide = Glide.with(context);
    }
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View v = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.ifunpot_feed, parent, false);
        ViewHolder viewHolder = new ViewHolder(v);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(final ViewHolder holder, final int position) {
        final NewFeedModel newFeedModel = newFeedModels.get(position);
        imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
        holder.tv_uploader_name.setText(newFeedModel.getFeedPostName());
        holder.tv_uploader_group.setText(newFeedModel.getFeedGroupName());
        holder.post_info.setText(newFeedModel.getFeedInfo());
        holder.tags.setText(newFeedModel.getFeedTags());
        holder.gid.setText(newFeedModel.getFeedGroupID());
        holder.feedid.setText(newFeedModel.getFeedID());

        glide.load(newFeedModels.get(position).getFeedimageURL()).into(holder.uploader_pro_pic);
        glide.load(newFeedModels.get(position).getFeedPostImageURL()).into(holder.post_pic);
    }

    @Override
    public int getItemCount() {
        return newFeedModels.size();
    }

    class ViewHolder extends RecyclerView.ViewHolder{
        public ImageView uploader_pro_pic, post_pic;
        public TextView tv_uploader_name, tv_uploader_group, post_info,tags, comments, gid,feedid, share, totalcomment;
        LinearLayout parentLayout, infophoto;
        final ImageView ppic;

        public ViewHolder(View itemView) {
            super(itemView);

            uploader_pro_pic = (ImageView) itemView.findViewById(R.id.uploader_pro_pic);
            post_info = (TextView) itemView.findViewById(R.id.post_info);
            tv_uploader_name = (TextView) itemView.findViewById(R.id.tv_uploader_name);
            tv_uploader_group = (TextView) itemView.findViewById(R.id.tv_uploader_group);
            post_pic = (ImageView) itemView.findViewById(R.id.post_pic);
            ppic = (ImageView) itemView.findViewById(R.id.post_pic);
            parentLayout = itemView.findViewById(R.id.post_layout);
            infophoto = itemView.findViewById(R.id.infophoto);
            tags = itemView.findViewById(R.id.posttag);
            comments = itemView.findViewById(R.id.comments);
            gid = itemView.findViewById(R.id.gid);
            feedid = itemView.findViewById(R.id.feedid);
            share = itemView.findViewById(R.id.share);
            //totalcomment = itemView.findViewById(R.id.totalcomment);

        }
    }
}

who knows where is the problem? because it's cannot show new comment when I post the new comment. I need to leave or change to other activity then back.