How to create a JSONObject of Objects? Android

Question

I want to create a JSONObject like this:

[
 {
 id:01,
 name:"John",
 number:010
 },
 {
 id:02,
 name:"Mike",
 number: 020
 }
]

This is my code:

public void equipmentViewed(List<Equipment> equipmentSelected, final OnControlResponseListener listener, String description, Equipment equipment) throws JSONException {
 wsAccessControl = WSAccessControl.getInstance();
 EquipmentViewed equipmentViewed = new EquipmentViewed();
 equipmentViewed.setEquipment(equipmentsCount(equipmentSelected));
 JSONObject jsonObject = new JSONObject();
 try {
 jsonObject.put("", new JSONArray(equipmentViewed.getEquipment().toString()));
 } catch (JSONException e) {
 Log.e(TAG, "Failed to create json object. Cause: " + e.getMessage());
 }
 String url = Constants.PROVIDER_DOMAIN_URL + Constants.REQUEST_EQUIPMENT;
 wsAccessControl.makeWSRequest(RequestType.POST, url, jsonObject, new Response.Listener<String>() {
 @Override
 public void onResponse(String response) {
 listener.OnResponseReceived(response);
 }
 }, new Response.ErrorListener() {
 @Override
 public void onErrorResponse(VolleyError error) {
 listener.OnResponseError(error);
 }
 }, true);
 }

Where EquipmentViewed contains a String list equipment.

• ρяσѕρєя K: What String is returned from equipmentViewed.getEquipment() ? please share
• Eduardo Bonfa: it's a list of information, like, name, model, serialNumber, location

Answer 1

You can create the JSON you want using this:

JSONArray array = new JSONArray();
JSONObject obj1 = new JSONObject();
obj1.put("id", "01");
obj1.put("name", "John");
obj1.put("number", "010");
JSONObject obj2 = new JSONObject();
obj2.put("id", "02");
obj2.put("name", "Mike");
obj2.put("number", "020");
array.put(obj1);
array.put(obj2);
/* array = [
 {
 id:01,
 name:"John",
 number:010
 },
 {
 id:02,
 name:"Mike",
 number: 020
 }
 ]
 */

• Eduardo Bonfa: I used Gson, way easier. But Thank you anyway

Answer 2

You can use the JSONTokener for this Task.

 try{
 String json = equipmentViewed.getEquipment().toString();
 JSONArray object = (JSONArray) new JSONTokener(json).nextValue();
 JSONObject firstEntry = (JSONObject) object.get(0);
 JSONObject sndEntry = (JSONObject) object.get(1);
 }catch (JSONException ex){
 //TODO handle Error here
 }

If your equipmentViewed.getEquipment().toString()returns the following:

 /* String json =
 [
 {
 id:01,
 name:"John",
 number:010
 },
 {
 id:02,
 name:"Mike",
 number: 020
 }
 ] */

• Eduardo Bonfa: but in this case something like this is created: { id: [ { 010; 020 } ] right?
• woley: sry I got your question wrong and edited the answer. Does this solve your problem?
• Eduardo Bonfa: I used Gson, way easier. But Thank you anyway

Answer 3

You can try something like this :

JsonArray jsonArray = new JsonArray();
for (int i = 0; i < equipmentViewed.getEquipment().size(); i++) {
 JsonObject jsonObject = new JsonObject();
 jsonObject.put("id", equipmentViewed.getEquipment().get(i).getId());
 jsonObject.put("name", equipmentViewed.getEquipment().get(i).getName());
 jsonObject.put("number", equipmentViewed.getEquipment().get(i).getNumber());
 jsonArray.put(jsonObject);
}

You will have all the data in your JsonArray object jsonArray. I am assuming you the objects in your equipmentViewed.getEquipment() list have those getter methods.

All the best :)

• Eduardo Bonfa: I used Gson, way easier. But Thank you anyway