How to create JSONObject and JSON ARRAy from json string in android?

Question

My String contains json

result=[{"USER_ID":83,"PROJECT_BY_DETAILS":"An adaptation of a nursery rhyme into a dramatic film"},{"USER_ID":88,"PROJECT_BY_DETAILS":"Test - over ye mountain blue "}]

How to create JSONOBject and JSONarray from this string

I used this code

JSONObject json =new JSONObject(result);
            //Get the element that holds the earthquakes ( JSONArray )
            JSONArray earthquakes = json.getJSONArray("");

i got error

Error parsing data org.json.JSONException: Value [{"USER_ID":83,"PRO

score 0 · Answer 1 · edited May 23 '17 at 12:21

0

If it starts with [ its an array, try with:

JSONArray json =new JSONArray(result);

Difference between JSONObject and JSONArray

edited May 23 '17 at 12:21

Community

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answered Jul 03 '15 at 15:14

isma3l

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Pedro Varela · Answer 2 · 2015-07-03T15:29:17.563

use Gson for you to do that.

That Json response is an array you know it because of the square brackets [].

Create a mapping object (a java class) with field USER_ID and PROJECT_BY_DETAILS.

public class yourClass(){ public String USER_ID; public String PROJECT_BY_DETAILS; }
Create a Type array like so.

final Type typeYourObject = new TypeToken>(){}.getType();
define your list private

List yourList;
Using Gson you will convert that array to a List like so

yourList = gson.fromJson(yourJson, typeYourObject);
with that list later you can do whatever you want. Also with Gson convert it back to JsonArray or create a customs JsonObject.

That is all you need. I explain it. The only thing I miss was the instantiation of Gson. like Gson gson = new Gson(); — Pedro Varela, Jul 03 '15 at 15:20

score 0 · Answer 3 · answered Jul 03 '15 at 15:20

use this code for your JsonArray:

try {
                        JSONArray json = new JSONArray(YOUR_JSON_STRING);
                         for (int i = 0; i < json.length(); i++) {

                            JSONObject jsonDATA = json.getJSONObject(i);

                            String jsonid = jsonDATA.getInt("USER_ID");
                            String jsondetails = jsonDATA.getString("PROJECT_BY_DETAILS");
                            }
                             } catch (JSONException e) {
                        return null;
                    }

score 0 · Answer 4 · answered Jul 23 '15 at 20:57

According to my understanding the JSON object looks like this,

{ "RESULT":[ { "USER_ID":83, "PROJECT_BY_DETAILS":"An adaptation of a nursery rhyme into a dramatic film" }, { "USER_ID":88, "PROJECT_BY_DETAILS":"Test - over ye mountain blue " } ] }

You are converting this to a String and you wish to re-construct the JSON object. The decode function in the android-side would be this,

void jsonDecode(String jsonResponse) { try { JSONObject jsonRootObject = new JSONObject(jsonResponse); JSONArray jData = jsonRootObject.getJSONArray("RESULT"); for(int i = 0; i < jData.length(); ++i) { JSONObject jObj = jData.getJSONObject(i); String userID = jObj.optString("USER_ID"); String projectDetails = jObj.optString("PROJECT_BY_DETAILS"); Toast.makeText(context, userID + " -- " + projectDetails,0).show(); } } catch(JSONException e) { e.printStackTrace(); } }

How to create JSONObject and JSON ARRAy from json string in android?

4 Answers4