Model

Item.java

public class Item implements Parcelable {

    private int id;
    private String name;
    private String brand;
    private Integer price;

    public Item(int id, String name, String brand, Integer price) {
        this.id = id;
        this.name = name;
        this.brand = brand;
        this.price = price;
    }

    public Item() {
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getBrand() {
        return brand;
    }

    public void setBrand(String brand) {
        this.brand = brand;
    }

    public Integer getPrice() {
        return price;
    }

    public void setPrice(Integer price) {
        this.price = price;
    }


    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(this.id);
        dest.writeString(this.name);
        dest.writeString(this.brand);
        dest.writeValue(this.price);
    }

    protected Item(Parcel in) {
        this.id = in.readInt();
        this.name = in.readString();
        this.brand = in.readString();
        this.price = (Integer) in.readValue(Integer.class.getClassLoader());
    }

    public static final Parcelable.Creator<Item> CREATOR = new Parcelable.Creator<Item>() {
        @Override
        public Item createFromParcel(Parcel source) {
            return new Item(source);
        }

        @Override
        public Item[] newArray(int size) {
            return new Item[size];
        }
    };

    @Override
    public String toString() {
        return "Item{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", brand='" + brand + '\'' +
                ", price=" + price +
                '}';
    }
}

public class Result implements Parcelable {

    private int code;
    private String message;
    @Nullable
    private Item item;
    @Nullable
    private ArrayList<Item> items;

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    @Nullable
    public Item getItem() {
        return item;
    }

    public void setItem(@Nullable Item item) {
        this.item = item;
    }

    @Nullable
    public ArrayList<Item> getItems() {
        return items;
    }

    public void setItems(@Nullable ArrayList<Item> items) {
        this.items = items;
    }

    public Result(int code, String message, Item item, ArrayList<Item> items) {
        this.code = code;
        this.message = message;
        this.item = item;
        this.items = items;
    }


    @Override
    public int describeContents() {
        return 0;
    }

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(this.code);
        dest.writeString(this.message);
        dest.writeParcelable(this.item, flags);
        dest.writeTypedList(this.items);
    }

    protected Result(Parcel in) {
        this.code = in.readInt();
        this.message = in.readString();
        this.item = in.readParcelable(Item.class.getClassLoader());
        this.items = in.createTypedArrayList(Item.CREATOR);
    }

    public static final Creator<Result> CREATOR = new Creator<Result>() {
        @Override
        public Result createFromParcel(Parcel source) {
            return new Result(source);
        }

        @Override
        public Result[] newArray(int size) {
            return new Result[size];
        }
    };
}