CartFragment

package com.example.rr.eallowancemobileapp;


import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.Toast;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


/**
 * A simple {@link Fragment} subclass.
 */
public class CartFragment extends Fragment {

    private RecyclerView recyclerView;
    private RecyclerView.Adapter adapter;

    private List<CartItem> cartItems;

    String cardno = SharedPrefManager.getInstance(getContext()).getUserCardNo();

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View myView = inflater.inflate(R.layout.fragment_cart, container, false);

        recyclerView = (RecyclerView) myView.findViewById(R.id.recycleView_Cart);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));

        Button cartComplete = (Button) myView.findViewById(R.id.cartComplete);
        cartComplete.setText("PROCEED WITH PAYMENT. TOTAL: P");

        cartItems = new ArrayList<>();

        loadRecyclerViewData();

        return myView;
    }

    private void loadRecyclerViewData(){
        final ProgressDialog progressDialog = new ProgressDialog(getContext());
        progressDialog.setMessage("Loading Cart...");
        progressDialog.show();


        StringRequest stringRequest = new StringRequest(
                Request.Method.POST,
                Constants.URL_GET_CART,
                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String response) {
                        progressDialog.dismiss();
                        try {
                            JSONObject jsonObject = new JSONObject(response);
                            JSONArray array = jsonObject.getJSONArray("cart");
                            for (int i = 0; i<array.length(); i++){
                                JSONObject o = array.getJSONObject(i);
                                CartItem item = new CartItem(
                                        o.getString("cardno"),
                                        o.getString("product_id"),
                                        o.getString("name"),
                                        o.getString("quantity"),
                                        o.getString("price"),
                                        o.getString("category")
                                );
                                cartItems.add(item);
                            }
                            Collections.sort(cartItems, new Comparator<CartItem>() {
                                @Override
                                public int compare(CartItem o1, CartItem o2) {
                                    return o1.getname().compareToIgnoreCase(o2.getname());
                                }
                            });
                            adapter = new CartAdaptor(cartItems, getContext());
                            recyclerView.setAdapter(adapter);

                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        progressDialog.dismiss();
                        Toast.makeText(getContext(), error.getMessage(), Toast.LENGTH_LONG).show();
                    }
                }
        ){
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                Map<String, String> params = new HashMap<>();
                params.put("cardno", cardno);
                return params;
            }
        };

        RequestQueue requestQueue = Volley.newRequestQueue(getContext());
        requestQueue.add(stringRequest);
    }


}