public class MainActivity extends AppCompatActivity {

    ArrayList<Dessert> desserts;
    RecyclerView rv;
    ProgressBar pb;
    SwipeRefreshLayout srl;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

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

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

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

                new Handler().postDelayed(new Runnable() {
                    @Override public void run() {
                        srl.setRefreshing(false);
                    }
                }, 1000); // Delay in millis
            }
        });

        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();
    }

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

        if(this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT){
            recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
        }else{
            recyclerView.setLayoutManager(new GridLayoutManager(this, 4));
        }

        DessertAdapter mAdapter = new DessertAdapter(this, desserts);
        recyclerView.setAdapter(mAdapter);
        recyclerView.setItemAnimator(new DefaultItemAnimator());
    }

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

        RequestQueue queue = Volley.newRequestQueue(this);
        String url = "https://www.themealdb.com/api/json/v1/1/filter.php?c=Dessert";

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

                    @Override
                    public void onResponse(JSONObject response) {
                        String id, meal, photo;
                        desserts = new ArrayList<>();

                        try {
                            //ambil objek meals
                            JSONArray jsonArray = response.getJSONArray("meals");
                            desserts.clear();

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

                                    id = data.getString("idMeal").toString().trim();
                                    meal = data.getString("strMeal").toString().trim();
                                    photo = data.getString("strMealThumb").toString().trim();

                                    //masukkan kedalam Arraylist
                                    desserts.add(new Dessert(id, meal, photo ));
                                }

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

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

            @Override
            public void onErrorResponse(VolleyError error) {
                pb.setVisibility(ProgressBar.GONE);
                Toast.makeText(MainActivity.this, "Connection problem!", Toast.LENGTH_SHORT).show();
            }
        });

        queue.add(jsObjRequest);
    }
}