receiving data from web server doesn't work (volley library android)

Question

For fetch data I use volley library. When i use Local Address everything work right. My activity shows data.

String json_url = "http://192.168.1.4/android/contactinfo.php";

but when I fetch data from Web server (internet) my activity doesn't show anything, so it is empty without any error

 String json_url = "http://www.viratebco.com/phpme/3/1.php";

I compared the output of these two pages and they were exactly like each other. this is my php code

    <?php
    error_reporting(0);
    @ini_set('display_errors', 0);
    $host="localhost";
    $username="root";
    $pwd="";
    $db="android";
    $con = mysqli_connect($host,$username,$pwd,$db) or die ('unable to connect');
   mysqli_set_charset($con, "utf8");
$sql = "SELECT * FROM imageactor";

$result = mysqli_query($con,$sql);

$response = array();
while($row = mysqli_fetch_array($result))
{
    array_push($response,array("Name"=>$row["name"],"Pic"=>$row["pic"],"Description"=>$row["description"]));

}
header("Connection: Keep-alive");
header("Content-length: 468");
header('Content-type: application/json');
echo json_encode($response,JSON_UNESCAPED_UNICODE);

and this is my class for fetch data of server

   public class BackgrundTask {
    Context context;
    ArrayList<Contact_actors_list> arrayList = new ArrayList<>();

    String json_url = "http://192.168.1.4/phpme/3/1.php";


    public BackgrundTask (Context context)
    {
        this.context = context;
    }


    public ArrayList<Contact_actors_list> getList()
    {


        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.POST, json_url,(String) null,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d("TAG67", response.toString());
                        int count = 0;
                        while (count<response.length())
                        {
                            try {
                              //  Log.d("TAG67", "kk"+count);

                                JSONObject jsonObject = response.getJSONObject(count);
                             //   Log.d("TAG67", "Pic "+jsonObject.getString("Pic"));
                            //    Log.d("TAG67", "Description "+jsonObject.getString("Description"));
                            //    Log.d("TAG67", "Name "+jsonObject.getString("Name"));
                                Contact_actors_list contact_actors_list = new Contact_actors_list(jsonObject.getString("Name"),jsonObject.getString("Pic"),jsonObject.getString("Description"));
                                Log.d("TssssssssAG67", contact_actors_list.getDescription());
                                arrayList.add(contact_actors_list);
                                count++;

                            } catch (JSONException e) {
                                e.printStackTrace();
                                Log.e("tageiu", "Error at sign in : " + e.getMessage());


                            }
                        }

                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                error.printStackTrace();
                Log.e("ERtROR123", "Error123 "+ error.getMessage());
                Log.d("ERtROR123", "Error123 "+ error.getMessage());
            }

        }

        );
        int x=4;// retry count
        jsonArrayRequest.setRetryPolicy(new DefaultRetryPolicy(DefaultRetryPolicy.DEFAULT_TIMEOUT_MS * 48,
                x, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));

        MySingleton.getmInstance(context).addToRequestque(jsonArrayRequest);
        return arrayList;
    }
}

My MySingleton class

public class MySingleton {
    private static MySingleton mInstance;
    private RequestQueue requestQueue;
    private static Context mCtx;
    private MySingleton(Context context){
        mCtx = context;
        requestQueue = getRequestQueue();
    }

    public RequestQueue getRequestQueue()
    {
        if (requestQueue==null)
        {
            requestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());
        }
        return  requestQueue;
    }
    public static synchronized MySingleton getmInstance(Context context)
    {
        if (mInstance == null)
        {
            mInstance = new MySingleton(context);
        }
        return mInstance;
    }
    public <T> void addToRequestque(Request<T> request)
    {
        request.setRetryPolicy(new DefaultRetryPolicy(0, -1, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
        requestQueue.add(request);
    }


}

My actorList Page

public class actorsList extends AppCompatActivity {
    RecyclerView recyclerView;
    RecyclerView.Adapter adapter;
    RecyclerView.LayoutManager layoutManager;
    ArrayList<Contact_actors_list> arrayList = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_actors_list);
        System.setProperty("http.keepAlive", "false");
        recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

        recyclerView.addOnItemTouchListener(
                new RecyclerItemClickListener(actorsList.this, recyclerView ,new RecyclerItemClickListener.OnItemClickListener() {

                    @Override public void onItemClick(View view, int position) {
                        Intent intent = new Intent(actorsList.this, DetailsAsctor.class);
                        Contact_actors_list pp = arrayList.get(position);
                        intent.putExtra("pic", pp.getPic());
                        intent.putExtra("title", pp.getName());
                        startActivity(intent);
                        //Toast.makeText(actorsList.this,position,Toast.LENGTH_LONG).show();
                    }

                    @Override public void onLongItemClick(View view, int position) {
                        Toast.makeText(actorsList.this,"click",Toast.LENGTH_LONG).show();
                    }
                })
        );
        layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        recyclerView.setHasFixedSize(true);
        BackgrundTask backgroundTask = new BackgrundTask(actorsList.this);
        arrayList = backgroundTask.getList();
        adapter = new RecyclerAdapterActorsList(arrayList);
        recyclerView.setAdapter(adapter);

    }

}

RecyclerAdapterActorsList

public class RecyclerAdapterActorsList extends RecyclerView.Adapter<RecyclerAdapterActorsList.MyViewHolder> {
    ArrayList<Contact_actors_list> arrayList = new ArrayList<>();

    public  RecyclerAdapterActorsList(ArrayList<Contact_actors_list> arrayList)
    {
        this.arrayList = arrayList;
    }
    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item_actors_list,parent,false);
        MyViewHolder myViewHolder = new MyViewHolder(view);

        return myViewHolder;
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {

        holder.Name1.setText(arrayList.get(position).getName());
        holder.Description1.setText(arrayList.get(position).getDescription());
        Picasso.with(holder.Pic1.getContext()).load(Uri.parse(arrayList.get(position).getPic())).into(holder.Pic1);

    }
    @Override
    public int getItemCount() {
        return arrayList.size();
    }
    public static class MyViewHolder extends RecyclerView.ViewHolder
    {

        TextView Name1;
        TextView Description1;
        ImageView Pic1;
        public MyViewHolder(View itemView) {

            super(itemView);
            Name1 = (TextView) itemView.findViewById(R.id.name);
            Description1 = (TextView) itemView.findViewById(R.id.description);
            Pic1  = (ImageView) itemView.findViewById(R.id.pic);

        }
    }


}

My app works right but just when i fetch data from local services.

Answer 1

Update:

I checked your code everything was at it's place except listener.onReponseReceive(arrayList); as mentioned in my answer it should be right after where while loop ends. Now your recyclerview is displaying items

Update:

The reason You are not getting the list in your recyclerview is because it takes some time to fetch response from webserver and your list get return earlier. In order to Resolve this, Try this

Create an Interface

    public interface WebResponseListener{
     void onReponseReceive(ArrayList <Contact_actors_list> list);
   }

In your BackgrundTask declare a variable of this interface

WebResponseListener listener;
public BackgrundTask (Context context,WebResponseListener listener)
    {
       this.listener = listener
        this.context = context;
    }

Make your getList() return void and do the following changes

 public void getList(){
//Where your while condition ends
//add following line
  listener.onReponseReceived(arrayList);
    -----
}

IN actorsList class Make yout actorList class implements the inferface as

public class actorsList extends AppCompatActivity implements WebResponseListener

replace the following lines

BackgrundTask backgroundTask = new BackgrundTask(actorsList.this); 
 arrayList = backgroundTask.getList();

with

BackgrundTask backgroundTask = new BackgrundTask(this,this); 
arrayList = new ArrayList<>();
adapter = new RecyclerAdapterActorsList(arrayList);
recyclerView.setAdapter(adapter);
backgroundTask.getList();

Add the following method in your actorsList class

public void onReponseReceive(ArrayList <Contact_actors_list> list){
    actorsList.this.arrayList.addAll(list);
    actorsList.this.adapter.notifyDataSetChanged();
}