Question

我正在使用ArrayList<HashMap<String,String>>来存储我的购物车商品。但我需要将其转换为JSONArray以将其发送到数据库。但是，当我将其转换为JSONArray时，JSONArray看起来像这样：

03-13 11：09：28.842：D / cart之前（1339）：[{image = 2130837526，   category = Chairs，Quantity = 1，price = 400，name = chair，prodId = 34}，   {image = 2130837566，category = Mirrors，Quantity = 1，price = 3000，name = La   Fonda，prodId = 35}]

03-13 11：09：28.842：转换成JSONArray后的D / cart（1339）：   [＆＃34; {image = 2130837526，category =椅子，数量= 1，价格= 400，   name = chair，prodId = 34}＆＃34;，＆＃34; {image = 2130837566，category = Mirrors，   数量= 1，价格= 3000，名称= La Fonda，prodId = 35}＆＃34;]

我认为这是错误的。相反，它应该转换为这样的东西：

cartitems=[{"name":"Chair","price":"1001","prodId":"2","category":"Chairs","image":"2130837519","Quantity":"1"},{"name":"Baxton Studio Club Chair","price":"4545","prodId":"5","category":"Chairs","image":"2130837521","Quantity":"1"}]

要转换为JSONArray的代码：

protected String doInBackground(String... args) {
    AddtoCart obj = (AddtoCart) getApplicationContext();
    JSONArray cart = new JSONArray(obj.getCart());
    HashMap<String, String> params = new HashMap<String, String>();
    params.put("username", username);
    params.put("email", email);
    params.put("payment", payment);
    params.put("address", useraddress);
    params.put("contact", contact);
    params.put("city", usercity);
    params.put("cartitems", cart.toString());
    Log.d("params", params.toString());

    JSONObject json = jParser.makeHttpRequest(url_all_products, "POST", params);
    try {
        success = json.getInt("success");
        message = json.getString("message");
    } catch (JSONException e) {
        e.printStackTrace();
    }
    return null;
}

持有ArrayList的课程：

public class AddtoCart extends Application {
    private static final String TAG_QUANTITY = "Quantity";
    private static final String TAG_PRICE = "price";
    ArrayList<HashMap<String, String>> cart = new ArrayList<HashMap<String, String>>();

    public void setCart(ArrayList<HashMap<String, String>> data) {
        //cart = data;
        cart.addAll(data);
        Log.d("Items in the cart", String.valueOf(cart));
    }

    public ArrayList<HashMap<String, String>> getCart() {
        return cart;
    }

    public int getSize() {
        return cart.size();
    }

    public void updateCart(ArrayList<HashMap<String, String>> data) {
        cart = data;
        Log.d("UPDATED CART", String.valueOf(cart));
    }

    public void updateQuantity(int index, String quantity) {
        cart.get(index).put(TAG_QUANTITY,quantity);
    }
}

Answer 1

我发现这对我的项目有帮助：

我的ArrayList中的对象＆lt;＆gt;

public class ListItem {
    private long _masterId;
    private String _name;
    private long _category;

    public ListItem(long masterId, String name, long category) {
        _masterId = masterId;
        _name = name;
        _category = category;
    }

    public JSONObject getJSONObject() {
        JSONObject obj = new JSONObject();
        try {
            obj.put("Id", _masterId);
            obj.put("Name", _name);
            obj.put("Category", _category);
        } catch (JSONException e) {
            trace("DefaultListItem.toString JSONException: "+e.getMessage());
        }
        return obj;
    }
}

实际转换：

ArrayList<ListItem> myCustomList = ArrayList<ListItem>();
JSONArray jsonArray = new JSONArray();
for (int i=0; i < myCustomList.size(); i++) {
        jsonArray.put(myCustomList.get(i).getJSONObject());
}

将ArrayList转换为JSONArray

1 个答案: