JSONException while converting to JSONArray

Question

I obtain a JSONObject from my server in my Android application through a service and in order to send to my activity I convert JSONObject to a string with

String myjson= gson.toJson(object);
b.putString("json", myjson);

And transfer the string to my activity where I recreate the JSONObject from String

Gson gson = new Gson();
JSONObject jobj = gson.fromJson(mydata, JSONObject.class);
JSONArray jarray = jobj.getJSONArray("myitems");

My JSON is as below

{"myitems":[{"event_id":"1","title":"Music launch party at makeover","description":"Music Launch function at Makeover","store_id":"2","user_id":"1","category_id":"1","submittedby":"store","start_date":"2015-02-03 09:00:01","end_date":"2015-02-03 20:00:00","price":"1000","gallery_1":"","gallery_2":"","gallery_3":"","add_lat":"30.693771","add_lon":"76.76486","distance":"10.329089177806534"},{"event_id":"2","title":"The Bacardi party at the New year bash","description":"Altius organizes a new year bash at their Night House.","store_id":"2","user_id":"1","category_id":"3","submittedby":"user","start_date":"2015-02-05 17:08:40","end_date":"2015-02-05 22:08:48","price":"2000","gallery_1":"","gallery_2":"","gallery_3":"","add_lat":"30.69461","add_lon":"76.76176","distance":"10.575941394542852"}]}

But I am getting error on getting jsonarray from the jsonobject. what should be the right way to obtain the jsonarray from the jsonobject or what wrong I am doing here.

jsonexception .gson.internal.LinkedTreeMap cannot be converted to jsonarray — user2779311
– user2779311, Commented Feb 5, 2015 at 16:28
Here a bit of advice which i got from net while searching JSON manipulation that when working with nested Objects or array in JSON try to make mapper class properly then do your work. — mfaisalhyder
– mfaisalhyder, Commented Feb 5, 2015 at 16:37

J.Vassallo · Accepted Answer · 2015-02-05 16:48:59Z

2

Try the following :

Create a class containing a replica of the json objects

public class MyItem {

String event_id;
String title;
String description;
String store_id ;
String user_id;
String category_id;
String submittedby;
String start_date;
String end_date;
String price;
String gallery_1;
String gallery_2;
String gallery_3;
String add_lat;
String add_lon;
String distance;

public MyItem() {
}
}

In your case myjson is the string containing the json reply..so

        JSONArray array = null;

        try {
            JSONObject jsonResp = new JSONObject(myjson);
            array = jsonResp.getJSONArray("myitems");

        } catch (JSONException e) {

            e.printStackTrace();
        }

Then you can iterate through the array and store objects in your custom class like so :

for(int i = 0; i < array.length(); i++){ JSONObject json2 = null;

    try {
           json2 = (JSONObject) array.get(i);
        } catch (JSONException e) {
           e.printStackTrace();
        }

    Gson gson = new Gson();
    MyItem myItem = gson.fromJson(json2.toString(), MyItem.class);


    //Do whatever you want with the object here

}

answered Feb 5, 2015 at 16:48

J.Vassallo

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8 Comments

user2779311 Over a year ago

if i am not using gson to convert string back to jsonobject and do as you have written i get error in getting jsonarray that no value for myitems.kindly update

J.Vassallo Over a year ago

its because you are not mapping the json object into a custom class...try my example it works...i tested it

J.Vassallo Over a year ago

this is logcat of title field : myITEM : Music launch party at makeover

mfaisalhyder Over a year ago

Plus one from my side because that is a legit approach towards json handling and that's what i said above .!

J.Vassallo Over a year ago

true i just noticed that :D

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