public class MainActivity extends AppCompatActivity {

    public static final String TAG = "TAG";

    private ListView listView;
    private View     parentView;

    private ArrayList<Contact> contactList;
    private ContactAdapter     adapter;

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

        contactList = new ArrayList<>();

        listView = (ListView) findViewById(R.id.listView);
        parentView = findViewById(R.id.parentLayout);

        FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
        assert fab != null;
        fab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(@NonNull final View view) {

                /**
                 * Checking Internet Connection
                 */
                if (InternetConnection.checkConnection(getApplicationContext())) {
                    final ProgressDialog dialog;
                    /**
                     * Progress Dialog for User Interaction
                     */
                    dialog = new ProgressDialog(MainActivity.this);
                    dialog.setTitle(getString(R.string.string_getting_json_title));
                    dialog.setMessage(getString(R.string.string_getting_json_message));
                    dialog.show();

                    //Creating an object of our api interface
                    ApiService api = RetroClient.getApiService();

                    /**
                     * Calling JSON
                     */
                    Call<List<Contact>> call = api.getMyJSON();

                    /**
                     * Enqueue Callback will be call when get response...
                     */

                    call.enqueue(new Callback<List<Contact>>() {

                        @Override
                        public void onResponse(Call<List<Contact>> call, Response<List<Contact>> response) {

                            Log.d(TAG, "Я в onResponse ");

                            //Dismiss Dialog
                            dialog.dismiss();

                            if (response.isSuccessful()) {
                                /**
                                 * Got Successfully
                                 */
                                contactList.addAll(response.body());
                                Log.d(TAG, "Я в блоке if (response.isSuccessful())");

                                /**
                                 * Binding that List to Adapter
                                 */
                                adapter = new ContactAdapter(MainActivity.this, contactList);
                                listView.setAdapter(adapter);

                            } else {
                                Snackbar.make(parentView, R.string.string_some_thing_wrong, Snackbar.LENGTH_LONG).show();
                            }
                        }

                        @Override
                        public void onFailure(Call<List<Contact>> call, Throwable t) {
                            dialog.dismiss();
                        }
                    });

                } else {
                    Snackbar.make(parentView, R.string.string_internet_connection_not_available, Snackbar.LENGTH_LONG).show();
                }
            }
        });
    }
}

public class ContactAdapter extends ArrayAdapter<Contact> {

    List<Contact> contactList;
    Context       context;
    private LayoutInflater mInflater;

    // Constructors
    public ContactAdapter(Context context, List<Contact> objects) {
        super(context, 0, objects);
        this.context = context;
        this.mInflater = LayoutInflater.from(context);
        contactList = objects;
    }

    @Override
    public Contact getItem(int position) {
        return contactList.get(position);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder vh;
        if (convertView == null) {
            View view = mInflater.inflate(R.layout.layout_row_view, parent, false);
            vh = ViewHolder.create((RelativeLayout) view);
            view.setTag(vh);
        } else {
            vh = (ViewHolder) convertView.getTag();
        }

        Contact item = getItem(position);

        vh.textViewTitleRu.setText(item.getTitleRu());
        vh.textViewTitleEng.setText(item.getTitleEng());

        return vh.rootView;
    }

    private static class ViewHolder {
        public final RelativeLayout rootView;
        public final TextView       textViewTitleRu;
        public final TextView       textViewTitleEng;

        private ViewHolder(RelativeLayout rootView, TextView textViewTitleRu, TextView textViewTitleEng) {
            this.rootView = rootView;
            this.textViewTitleRu = textViewTitleRu;
            this.textViewTitleEng = textViewTitleEng;
        }

        public static ViewHolder create(RelativeLayout rootView) {
            TextView textViewTitleRu = (TextView) rootView.findViewById(R.id.textViewTitleRu);
            TextView textViewTitleEng = (TextView) rootView.findViewById(R.id.textViewTitleEng);
            return new ViewHolder(rootView, textViewTitleRu, textViewTitleEng);
        }

    }

}

public interface ApiService {
    @GET("menuserver5/categories")
    Call<List<Contact>> getMyJSON();
}

public class RetroClient {

    private static final String ROOT_URL = "http://139.59.164.239:8080/";

    private static Retrofit getRetrofitInstance() {
        return new Retrofit.Builder()
                .baseUrl(ROOT_URL)
                .addConverterFactory(GsonConverterFactory.create())
                .build();
    }

    public static ApiService getApiService() {
        return getRetrofitInstance().create(ApiService.class);
    }
}

public class Contact {
    @SerializedName("id")
    @Expose
    private String id;

    @SerializedName("title_ru")
    @Expose
    private String titleRu;

    @SerializedName("title_eng")
    @Expose
    private String titleEng;

    @SerializedName("url")
    @Expose
    private String url;

    @SerializedName("img_url")
    @Expose
    private String imageUrl;

    @SerializedName("weight")
    @Expose
    private int weight;

    @SerializedName("menu_id")
    @Expose
    private int menuId;

    @SerializedName("status")
    @Expose
    private int status;

    /**
     * @return The id
     */
    public String getId() {
        return id;
    }

    /**
     * @return The name
     */
    public String getTitleRu() {
        return titleRu;
    }

    /**
     * @return The email
     */
    public String getTitleEng() {
        return titleEng;
    }

    public String getUrl() {
        return url;
    }

    public String getImageUrl() {
        return imageUrl;
    }

    public int getWeight() {
        return weight;
    }

    public int getMenuId() {
        return menuId;
    }

    public int getStatus() {
        return status;
    }
}

public Contact() {}

/**
*
* @param id
* @param titleRu
* @param weight
* @param status
* @param imageUrl
* @param titleEng
* @param menuId
* @param url
*/
public Contact(Integer id, String titleRu, String titleEng, String url, String imageUrl, Integer weight, Integer menuId, Integer status) {
    super();
    this.id = id;
    this.titleRu = titleRu;
    this.titleEng = titleEng;
    this.url = url;
    this.imageUrl = imageUrl;
    this.weight = weight;
    this.menuId = menuId;
    this.status = status;
}