Android Real Time ListView

I have a PHP for Backend that can insert a event to my Database and will put in my Android App ListView but its not adding when the App is already running. I tried notifyDataSetChanged(); and its not working.

Here is my code for my Newsfeed(ListView)

private ListView listView;
private FeedListAdapter listAdapter;
private List<FeedItem> feedItems;
private String URL_FEED = "http://ift.tt/1h8OvD4";


@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.activity_newsfeed, container, false);
    listView = (ListView) v.findViewById(R.id.list);
    feedItems = new ArrayList<>();
    listAdapter = new FeedListAdapter(getActivity(), feedItems);
    listView.setAdapter(listAdapter);
    //       new ColorDrawable(getResources().getColor(android.R.color.transparent)));
    // We first check for cached request
    Cache cache = AppController.getInstance().getRequestQueue().getCache();
    Cache.Entry entry = cache.get(URL_FEED);
    if (entry != null) {
        // fetch the data from cache
        try {
            String data = new String(entry.data, "UTF-8");
            try {
                parseJsonFeed(new JSONObject(data));
            } catch (JSONException e) {
                e.printStackTrace();
            }
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    } else {
        // making fresh volley request and getting json
        JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET,
                URL_FEED, null, new Response.Listener<JSONObject>() {

            @Override
            public void onResponse(JSONObject response) {
                VolleyLog.d(TAG, "Response: " + response.toString());
                if (response != null) {
                    parseJsonFeed(response);
                }
            }
        }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error: " + error.getMessage());
            }

        });
        // Adding request to volley request queue
        AppController.getInstance().addToRequestQueue(jsonReq);
        v.bringToFront();
    }return v;
}
/**
     * Parsing json reponse and passing the data to feed view list adapter
     * */
private void parseJsonFeed(JSONObject response) {
    try {
        JSONArray feedArray = response.getJSONArray("newsfeed");

        for (int i = 0; i < feedArray.length(); i++) {
            JSONObject feedObj = (JSONObject) feedArray.get(i);

            FeedItem item = new FeedItem();
            item.setId(feedObj.getInt("id"));
            item.setName(feedObj.getString("title"));

            // Image might be null sometimes
            String image = feedObj.isNull("image") ? null : feedObj
                    .getString("image");
            item.setImge(image);

            item.setStatus(feedObj.getString("type"));
            item.setProfilePic(feedObj.getString("profilePic"));
            item.setTimeStamp(feedObj.getString("timestamp"));
            feedItems.add(item);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
}

What I want is if I inserted a new event in my Database it will automatically added on my ListView like Facebook for example. How can I do that?