FirstFragment.java

public class FirstFragment extends Fragment {

    View fragment_view;
    ArrayList<Customer> customers;;
    ProgressBar pb;
    SwipeRefreshLayout srl;

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

        pb = (ProgressBar) rootView.findViewById(R.id.progress_horizontal);

        srl = (SwipeRefreshLayout) rootView.findViewById(R.id.swipeRefreshLayout);

        srl.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {

                load();

                new Handler().postDelayed(new Runnable() {
                    @Override public void run() {
                        // Stop animation (This will be after 1 seconds)
                        srl.setRefreshing(false);
                    }
                }, 1000); // Delay in millis
            }
        });

        // Configure the refreshing colors
        srl.setColorSchemeResources(android.R.color.holo_blue_bright,
                android.R.color.holo_green_light,
                android.R.color.holo_orange_light,
                android.R.color.holo_red_light);

        load();

        return rootView;
    }

    public void load(){
        pb.setVisibility(ProgressBar.VISIBLE);

        RequestQueue queue = Volley.newRequestQueue(getContext());
        String url = "[URL API KAMU]";

        JsonObjectRequest jsObjRequest = new JsonObjectRequest(
                Request.Method.GET,
                url,
                null,
                new Response.Listener<JSONObject>() {

                    @Override
                    public void onResponse(JSONObject response) {
                        String id, nama, telp;
                        customers = new ArrayList<>();

                        try {
                            JSONArray jsonArray = response.getJSONArray("result");
                            customers.clear();

                            if (jsonArray.length() != 0) {
                                for (int i = 0; i < jsonArray.length(); i++) {
                                    JSONObject data = jsonArray.getJSONObject(i);

                                    id = data.getString("idcustomer").toString().trim();
                                    nama = data.getString("namacustomer").toString().trim();
                                    telp = data.getString("telpcustomer").toString().trim();

                                    customers.add(new Customer(id, nama, telp ));
                                }

                                showRecyclerGrid();
                            }
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                        pb.setVisibility(ProgressBar.GONE);
                    }
                }, new Response.ErrorListener() {

            @Override
            public void onErrorResponse(VolleyError error) {
                // TODO Auto-generated method stub
                Log.d("Events: ", error.toString());

                pb.setVisibility(ProgressBar.GONE);
                Toast.makeText(getContext(), "Please check your connection", Toast.LENGTH_SHORT).show();
            }
        });

        queue.add(jsObjRequest);
    }

    private void showRecyclerGrid(){
        RecyclerView recyclerView = (RecyclerView) fragment_view.findViewById(R.id.rv);

        recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));

        CustomerAdapter mAdapter = new CustomerAdapter(getContext(), customers);
        recyclerView.setAdapter(mAdapter);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
    }
}