GSON. How to convert json object to json array?

Question

Now I am getting this JSON from API:

{"supplyPrice": {
        "CAD": 78,
        "CHF": 54600.78,
        "USD": 20735.52
      }}

But prices are dynamic, that's why I need JSON in this form

{
  "supplyPrice": [
    {
      "name": "CAD",
      "value": "78"
    },
    {
      "name": "TRY",
      "value": "34961.94"
    },
    {
      "name": "CHF",
      "value": "54600.78"
    },
    {
      "name": "USD",
      "value": "20735.52"
    }
  ]
}

How to do this using GSON?

If I understand your question correctly, you might receive a JsonObject or a JsonArray. You can call getAsJsonObject() method, and it that fails, call getAsJsonArray(). — Fustigador
– Fustigador, Commented Jan 29, 2016 at 12:28
Or use isJsonObject() method, and depending of the result, call getAsJsonObject() or getAsJsonArray(). — Fustigador
– Fustigador, Commented Jan 29, 2016 at 12:29

David Rauca · Accepted Answer · 2016-01-29 12:46:11Z

Hope this part of code to help you:

    String json = "{\"supplyPrice\": {\n" +
            "        \"CAD\": 78,\n" +
            "        \"CHF\": 54600.78,\n" +
            "        \"USD\": 20735.52\n" +
            "      }}";

    Gson gson = new Gson();
    JsonObject jsonObject = gson.fromJson(json, JsonObject.class);
    JsonObject supplyPrice = jsonObject.get("supplyPrice").getAsJsonObject();
    Type type = new TypeToken<HashMap<String, Double>>() {
    }.getType();
    HashMap<String, Double> parsedJson = gson.fromJson(supplyPrice, type);
    JsonArray jsonArray = new JsonArray();
    for(String key : parsedJson.keySet()) {
        JsonObject jo = new JsonObject();
        jo.addProperty("name", key);
        jo.addProperty("value", parsedJson.get(key));
        jsonArray.add(jo);
    }
    JsonObject result = new JsonObject();
    result.add("supplyPrice", jsonArray.getAsJsonArray());

bpr10 · Accepted Answer · 2016-01-29 12:58:30Z

GSON uses POJO classes to parse JSON into java objects.

Create A java class containing variables with names and datatype same as keys of JSON object. I think the JSON you are getting is not in the right format.

Class SupplyPrice{
 double CAD;
 double CHF;
 double TRY
}

Class SupplyPriceContainer{
 ArrayList<SupplyPrice> supplyPrice;
}

And your JSON should be

 {
    "CAD": 78,
    "CHF": 54600.78,
    "USD": 20735.52
 }



{
    "supplyPrice": [{
        "CAD": 78,
        "CHF": 0,
        "USD": 0
    }, {
        "CAD": 0,
        "CHF": 54600.00,
        "USD": 0
    }, {
        "CAD": 0,
        "CHF": 0,
        "USD": 20735.52
    }]
 }

Then you can Use GSON's `fromJson(String pJson, Class pClassType) to convert to JAVA object

  Gson gson = new Gson()
  ArrayList<SupplyPrice> suplyPrices = gson.fromJson(pJsonString, SupplyPrice.class);

Now you can use the arraylist to get the data.

Rohit Patil · Accepted Answer · 2016-01-29 12:30:18Z

You need to iterate all keys of supplyPrice object, and create New JSONArray using that key value then assign new array to supplyPrice key

JSONObject changeSupplyPrice(JSONObject JSONObj){
    try {
        JSONObject supplyPrice =JSONObj.getJSONObject("supplyPrice");
        JSONArray supplyPriceArray = new JSONArray();
        Iterator<?> keys = supplyPrice.keys();

        while( keys.hasNext() ) {
            String key = (String)keys.next();
            Log.e("JSON Array key",key);
            supplyPriceArray.put(new JSONObject("{"+key+":"+supplyPrice.getString(key)+"}"));

        }
        JSONObj.put("supplyPrice", supplyPriceArray);
        return JSONObj;
    } catch (JSONException e) {
        e.printStackTrace();
    }
    return null;
}

then call the function where you want

try {
        JSONObject JSONObj = new JSONObject("{'taxes': [],'name': 'Laboriosam iusto eum','requiresShipping': false,  'taxable': true,  'sku': 'QBA84J18832',  'product': 12, 'supplyPrice': {    'CAD': 78,   'CHF': 54600.78,    'USD': 20735.52  }}");
        JSONObj = changeSupplyPrice(JSONObj);
        Log.e("Return JSON Object",JSONObj.toString());
    } catch (JSONException e) {
        e.printStackTrace();
    }

Joe Richard · Accepted Answer · 2016-01-30 06:44:37Z

1

Thanks to Rohit Patil! I modified his code to my situation and it works!

private JSONObject modifyPrices(JSONObject JSONObj) {
    try {
        JSONObject supplyPrice = JSONObj.getJSONObject("supplyPrice");
        JSONArray supplyPriceArray = new JSONArray();
        Iterator<?> keys = supplyPrice.keys();
        while (keys.hasNext()) {
            String key = (String) keys.next();
            String value = supplyPrice.getString(key);
            supplyPriceArray.put(new JSONObject("{\"name\":" + key + ",\"value\":" + value + "}"));
        }
        JSONObj.put("supplyPrice", supplyPriceArray);
        return JSONObj;
    } catch (JSONException e) {
        e.printStackTrace();
    }
    return null;
}

answered Jan 30, 2016 at 6:44

Joe Richard

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Comments

peeyush pathak · Accepted Answer · 2016-01-29 12:22:24Z

0

You can directly convert it to an HashMap or TreeMap then navigate your map for all the keys.

This will be simplest way to achieve what you want.

answered Jan 29, 2016 at 12:22

peeyush pathak

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Comments

Mohamed Taher Alrefaie · Accepted Answer · 2016-11-13 12:37:41Z

0

Once look at this.. may help you.

 JSONObject json= json.getJSONObject("supplyPrice");
    Iterator i = json.keys();
    JSONArray jsonArray = new JSONArray();

    while (i.hasNext()){
        String key = (String) i.next();
        jsonArray.put(json.get(key));

edited Nov 13, 2016 at 12:37

Mohamed Taher Alrefaie

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answered Jan 29, 2016 at 13:11

ROOT

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Comments

Steve Moretz · Accepted Answer · 2019-05-20 15:23:19Z

0

We are only one line of code away from converting jsonObjects to arrays(Not jsonArrays but after making it a arrayList you can create jsonArray too,easily.)

fun <LIST_TYPE>jsonObjectToArray(jsonObject : JsonObject,listTypeClass : Class<LIST_TYPE>) = arrayListOf<LIST_TYPE>().apply { jsonObject.keySet().forEach { this.add(Gson().fromJson(jsonObject.get(it).toString(),listTypeClass))}}

answered May 20, 2019 at 15:23

Steve Moretz

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