Why can not I see a JSON query using the Volley library (Web Services)?

I'm trying to create a web service using the Volley library, only when I run my app on a physical device I do not see the data that is hosted on a free server.

The data is already in JSON but it does not remain unseen, already searched on the internet and I can not find any solution.

FragmentEvents.java

public class FragmentEventos extends Fragment {

private static final String URL_EVENTS ="http://mece.260mb.net/models/eventos_json.php?i=1"; /*URL de los datos JSON*/
List<Eventos> eventosList = new ArrayList<>(); /*Lista para almacenar todos los eventos*/
RecyclerView recyclerView;





public FragmentEventos() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment

    final View view = inflater.inflate(R.layout.fragment_eventos, container, false);
    recyclerView = view.findViewById(R.id.rcv); /*Obtenemos la vista del RecyclerView desde XML*/
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

    eventosList = new ArrayList<>(); /*Inicializar la lista de los Eventos*/

    //adapter = new EventosAdapter(getActivity(),eventosList);
    loadEvents(); /*Este método busca y analizas JSON para mostrarlo en el RecyclerView*/
    return view;
}
private void loadEvents(){     
    StringRequest stringRequest = new StringRequest(Request.Method.GET, URL_EVENTS,
            new Response.Listener<String>(){

                @Override
                public void onResponse(String response) {
                    try{
                        JSONArray array = new JSONArray(response); /*Convertir la cadena en objeto JSON de tipo array*/

                        for (int i=0; i<array.length(); i++){ /*Atravesar el objeto*/

                            JSONObject event = array.getJSONObject(i); /*Obtener el objeto del Evento de JSON Array*/

                            eventosList.add(new Eventos( /*Agregando el evento  a la lista de Eventos*/
                                    event.getInt("id"),
                                    event.getString("tema"),
                                    event.getString("ponente"),
                                    event.getString("hora"),
                                    event.getString("fecha"),
                                    event.getString("lugar")
                            ));
                        }
                        EventosAdapter adapter = new EventosAdapter(getActivity(),eventosList); /*Crea el objeto adaptador y configura para el RecyclerView*/
                        recyclerView.setAdapter(adapter);
                        adapter.notifyDataSetChanged();

                    }catch (JSONException e){
                        e.printStackTrace();
                    }
                }
            },
    new Response.ErrorListener(){

        @Override
        public void onErrorResponse(VolleyError error) {
            Toast.makeText(getActivity(),error.getMessage(),Toast.LENGTH_LONG).show();
        }
    });
    Volley.newRequestQueue(getActivity()).add(stringRequest); /*Agregar el stringRequest a la cola*/
}

}

EventAdapter.java

public class EventosAdapter extends RecyclerView.Adapter<EventosAdapter.EventoViewHolder> {
private Context context;
private List<Eventos> eventoList;



public EventosAdapter(Context context, List<Eventos> eventoList) {
    this.context = context;
    this.eventoList = eventoList;

}

@Override
public EventoViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(context);
    View view = inflater.inflate(R.layout.list_layout,null);
    return new EventoViewHolder(view);
}

@Override
public void onBindViewHolder(EventoViewHolder holder, int position) {
    Eventos eventos = eventoList.get(position);

    holder.tema.setText(eventos.getTema());
    holder.ponente.setText(eventos.getPonente());
    holder.lugar.setText(eventos.getLugar());
    holder.hora.setText(eventos.getHora());
    holder.fecha.setText(eventos.getFecha());
}

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

class EventoViewHolder extends RecyclerView.ViewHolder{
    TextView tema, ponente, lugar, fecha, hora;


    public EventoViewHolder(View itemView) {
        super(itemView);
        tema = (TextView) itemView.findViewById(R.id.tema);
        ponente = itemView.findViewById(R.id.ponente);
        lugar = itemView.findViewById(R.id.Lugar);
        fecha = itemView.findViewById(R.id.fecha);
        hora = itemView.findViewById(R.id.hora);
    }
}

}

POJO.java

public class Eventos {
private int id;
private String tema;
private String ponente;
private String lugar;
private String hora;
private String fecha;



public Eventos(int id, String tema, String ponente, String lugar, String hora, String fecha) {
    this.id = id;
    this.tema = tema;
    this.ponente = ponente;
    this.lugar = lugar;
    this.hora = hora;
    this.fecha = fecha;
}

public int getId() {
    return id;
}

public String getTema() {
    return tema;
}

public String getPonente() {
    return ponente;
}

public String getLugar() {
    return lugar;
}

public String getHora() {
    return hora;
}

public String getFecha() {
    return fecha;
}

}