JSONObject cannot be converted to JSONArray - Android

Question

I want to fetch data from this data to android. But it fails and get error org.json.JSONObject cannot be converted to JSONArray. I don't know where is the mistake.I struggle with this things. Please Help.. Thank you

{
  "categories" : {
    "href" : "https://api.spotify.com/v1/browse/categories?offset=0&limit=20",
    "items" : [ {
      "href" : "https://api.spotify.com/v1/browse/categories/toplists",
      "icons" : [ {
        "height" : 275,
        "url" : "https://t.scdn.co/media/derived/toplists_11160599e6a04ac5d6f2757f5511778f_0_0_275_275.jpg",
        "width" : 275
      } ],
      "id" : "toplists",
      "name" : "Top Lists"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/mood",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/original/mood-274x274_976986a31ac8c49794cbdc7246fd5ad7_274x274.jpg",
        "width" : 274
      } ],
      "id" : "mood",
      "name" : "Mood"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/party",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/links/partyicon_274x274.jpg",
        "width" : 274
      } ],
      "id" : "party",
      "name" : "Party"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/pop",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/pop-274x274_447148649685019f5e2a03a39e78ba52_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "pop",
      "name" : "Pop"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/popculture",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/trending-274x274_7b238f7217985e79d3664f2734347b98_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "popculture",
      "name" : "Trending"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/focus",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/original/genre-images-square-274x274_5e50d72b846a198fcd2ca9b3aef5f0c8_274x274.jpg",
        "width" : 274
      } ],
      "id" : "focus",
      "name" : "Focus"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/rock",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/rock_9ce79e0a4ef901bbd10494f5b855d3cc_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "rock",
      "name" : "Rock"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/indie_alt",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/indie-274x274_add35b2b767ff7f3897262ad86809bdb_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "indie_alt",
      "name" : "Indie"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/edm_dance",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/edm-274x274_0ef612604200a9c14995432994455a6d_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "edm_dance",
      "name" : "EDM/Dance"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/chill",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/chill-274x274_4c46374f007813dd10b37e8d8fd35b4b_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "chill",
      "name" : "Chill"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/dinner",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/original/dinner_1b6506abba0ba52c54e6d695c8571078_274x274.jpg",
        "width" : 274
      } ],
      "id" : "dinner",
      "name" : "Dinner"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/sleep",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/sleep-274x274_0d4f836af8fab7bf31526968073e671c_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "sleep",
      "name" : "Sleep"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/hiphop",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/original/hip-274_0a661854d61e29eace5fe63f73495e68_274x274.jpg",
        "width" : 274
      } ],
      "id" : "hiphop",
      "name" : "Hip Hop"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/workout",
      "icons" : [ {
        "height" : null,
        "url" : "https://t.scdn.co/media/links/workout-274x274.jpg",
        "width" : null
      } ],
      "id" : "workout",
      "name" : "Workout"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/rnb",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/r-b-274x274_fd56efa72f4f63764b011b68121581d8_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "rnb",
      "name" : "RnB"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/country",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/icon-274x274_6a35972b380f65dc348e0c798fe626a4_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "country",
      "name" : "Country"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/folk_americana",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/folk-274x274_ced3f75528ac61faf505863f7d7fae64_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "folk_americana",
      "name" : "Folk & Americana"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/metal",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/original/metal_27c921443fd0a5ba95b1b2c2ae654b2b_274x274.jpg",
        "width" : 274
      } ],
      "id" : "metal",
      "name" : "Metal"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/soul",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/soul-274x274_266bc900b35dda8956380cffc73a4d8c_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "soul",
      "name" : "Soul"
    }, {
      "href" : "https://api.spotify.com/v1/browse/categories/travel",
      "icons" : [ {
        "height" : 274,
        "url" : "https://t.scdn.co/media/derived/travel-274x274_1e89cd5b42cf8bd2ff8fc4fb26f2e955_0_0_274_274.jpg",
        "width" : 274
      } ],
      "id" : "travel",
      "name" : "Travel"
    } ],
    "limit" : 20,
    "next" : "https://api.spotify.com/v1/browse/categories?offset=20&limit=20",
    "offset" : 0,
    "previous" : null,
    "total" : 32
  }
}

This is my Java.class

class GetKat extends AsyncTask<String,String,String> {
    int sukses = 0;
    int maks=0;
    int TotalTrack=0;
    String id;
    public GetKat() {
        pDialog = new ProgressDialog(CategoryActivity.this);
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog.setMessage("Please Wait...");
        pDialog.setCancelable(false);
        pDialog.setIndeterminate(false);
        pDialog.show();
    }

    @Override
    protected String doInBackground(String... args) {
        gridItem item=null;
        List<NameValuePair> params = new ArrayList<NameValuePair>();
        params.add(new BasicNameValuePair("access_token", Token));
        params.add(new BasicNameValuePair("limit", "10"));
        try {
            JSONObject json = jParser.makeHttpRequest(BASE_URL, "GET", params);
            if (json != null) {

                nameList = new ArrayList<HashMap<String,String>>();
                Log.d("Semua Nama: ", json.toString());
                names = json.getJSONArray(TAG_HASIL);
                for(int i = 0; i < maks ;i++)
                {
                    JSONObject c = names.getJSONObject(i);
                    String id = c.getString("id");
                    String name=c.getString("name");
                    String url=c.getJSONObject("icons").getString("url");

                    HashMap<String,String> map = new HashMap<String,String>();

                    item=new gridItem();
                    item.setId(id);
                    item.setImage(url);
                    item.setKategori(name);

                    map.put("id",id);
                    map.put("name",name);
                    map.put("url",url);
                    nameList.add(map);
                    mGridData.add(item);
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Override
    protected void onPostExecute(String s) {
        pDialog.dismiss();
        CustomGridViewAdapter adapter = new CustomGridViewAdapter(
                CategoryActivity.this,R.layout.grid_item,mGridData);
        if(mGridData.size()>0)
        {
            mGridAdapter.setGridData(mGridData);
            data.setAdapter(adapter);
        }
        else
            Toast.makeText(getApplicationContext(), "No Data Available", Toast.LENGTH_SHORT).show();

    }
}

StackTrace

    W/System.err: org.json.JSONException: Value {"href":"https:\/\/api.spotify.com\/v1\/browse\/categories?offset=0&limit=10","items":[{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/toplists","icons":[{"height":275,"url":"https:\/\/t.scdn.co\/media\/derived\/toplists_11160599e6a04ac5d6f2757f5511778f_0_0_275_275.jpg","width":275}],"id":"toplists","name":"Top Lists"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/mood","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/original\/mood-274x274_976986a31ac8c49794cbdc7246fd5ad7_274x274.jpg","width":274}],"id":"mood","name":"Mood"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/party","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/links\/partyicon_274x274.jpg","width":274}],"id":"party","name":"Party"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/pop","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/derived\/pop-274x274_447148649685019f5e2a03a39e78ba52_0_0_274_274.jpg","width":274}],"id":"pop","name":"Pop"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/popculture","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/derived\/trending-274x274_7b238f7217985e79d3664f2734347b98_0_0_274_274.jpg","width":274}],"id":"popculture","name":"Trending"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/focus","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/original\/genre-images-square-274x274_5e50d72b846a198fcd2ca9b3aef5f0c8_274x274.jpg","width":274}],"id":"focus","name":"Focus"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/rock","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/derived\/rock_9ce79e0a4ef901bbd10494f5b855d3cc_0_0_274_274.jpg","width":274}],"id":"rock","name":"Rock"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/indie_alt","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/derived\/indie-274x274_add35b2b767ff7f3897262ad86809bdb_0_0_274_274.jpg","width":274}],"id":"indie_alt","name":"Indie"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/edm_dance","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/derived\/edm-274x274_0ef612604200a9c14995432994455a6d_0_0_274_274.jpg","width":274}],"id":"edm_dance","name":"EDM\/Dance"},{"href":"https:\/\/api.spotify.com\/v1\/browse\/categories\/chill","icons":[{"height":274,"url":"https:\/\/t.scdn.co\/media\/derived\/chill-274x274_4c46374f007813dd10b37e8d8fd35b4b_0_0_274_274.jpg","width":274}],"id":"chill","name":"Chill"}],"limit":10,"next":"https:\/\/api.spotify.com\/v1\/browse\/categories?offset=10&limit=10","offset":0,"previous":null,"total":32} at categories of type org.json.JSONObject cannot be converted to JSONArray
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at org.json.JSON.typeMismatch(JSON.java:100)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at org.json.JSONObject.getJSONArray(JSONObject.java:588)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at com.project.plbtw.songknow.CategoryActivity$GetKat.doInBackground(CategoryActivity.java:159)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at com.project.plbtw.songknow.CategoryActivity$GetKat.doInBackground(CategoryActivity.java:128)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at android.os.AsyncTask$2.call(AsyncTask.java:295)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
09-30 19:58:12.711 17054-19522/com.project.plbtw.songknow W/System.err:     at java.lang.Thread.run(Thread.java:818)

Answer 1

You have problem in your code in line:

String url=c.getJSONObject("icons").getString("url");

Solution: 1) Use "items" in place of "TAG_HASIL" like below:

names = json.getJSONArray("items");

Second: In place of

String url=c.getJSONObject("icons").getString("url");  

Use :

JSONObject job=c.getJSONArray("icons").get[0].getString("url"); 
String url=job.getString("url");

Answer 2

Categories is a JSON Object. Inside which items is JSON Array. You are not considering categories , but directly trying to iterate items

---

Use gson for better flexibility. You wont need this manual conversion. Add the following to your dependency

dependencies {
    compile 'com.solidfire.code.gson:gson:2.6.2'
}

Use gson format plugin Look at this video explaining how to implement this plugin

Now reformat your code accordingly. Go through this helpful link which explain this scenario and making coding easy.

Answer 3

Please Use net.sf.json library you can get from here : http://java2s.com/Code/Jar/j/Downloadjsonlibjar.htm

String aa =json.toString();    // json is jsonObject
JSONArray jarray = (JSONArray) JSONSerializer.toJSON(aa);

jarray is now a json array.

if you get any classNotFound Error just download supportive jars.