Json parsing through Array in android

Question

I am fetching Json data from url and the data is in this format.

{
"Android": {
"candidate": [
  {
    "id": "2466965",
    "candidate_name": "Surajit  Ray"
  },
  {
    "id": "2468313",
    "candidate_name": "Ankit  Dixit"
  }
]
}
}

i want to parse this json data and i am using this technique to do so.

 try {

              //  ***** Creates a new JSONObject with name/value mappings from the JSON string. *******
                jsonResponse = new JSONObject(Content);

            //    **** Returns the value mapped by name if it exists and is a JSONArray. **
            //    ******  Returns null otherwise.  ******
                JSONArray jsonMainNode = jsonResponse.optJSONArray("Android");
                //JSONArray jsonMainNode=   jsonResponse.getJSONArray("Android").getJSONObject(0).getJSONArray("candidate");
                //   ********** Process each JSON Node ***********

                int lengthJsonArr = jsonMainNode.length();

                System.out.println("length is " + lengthJsonArr);



                for(int i=0; i < lengthJsonArr; i++)
                {
                  //  ***** Get Object for each JSON node.**********
                    JSONObject jsonChildNode = jsonMainNode.getJSONObject(i);

                  //  ****** Fetch node values *********
                    String ide       = jsonChildNode.optString("id").toString();
                    String name       = jsonChildNode.optString("candidate_name").toString();
                    //String number     = jsonChildNode.optString("number").toString();
                    //String date_added = jsonChildNode.optString("date_added").toString();



                        OutputData +="id is"+ide+ " Name           : " + name;
                 /*   +" " + "Number      : "+ number +" "
                            + "Time                : "+ date_added +" " +"-------------------------------------------------- ";
       */
                    }

Toast.makeText(getApplicationContext(),"parsed data is "+OutputData,Toast.LENGTH_LONG).show();

but this is giving me error.please guide me as what are the various kind of json formats and how can we parse them in String.

Study Example:http://www.tutorialspoint.com/android/android_json_parser.htm — Suhas Bachewar, Jul 12 '16 at 05:56
Suhas B there this kind of json is parsed { \"Employee\" :[ { \"id\":\"01\", \"name\":\"Gopal Varma\", \"salary\":\"500000\" }, — Android enthusiast, Jul 12 '16 at 06:32
while i have Android added before candidate and that is why i am not able to access the data — Android enthusiast, Jul 12 '16 at 06:32
Use below lines to get correct response JSONObject jsonObj= jsonResponse.optJSONObject("Android"); JSONArray jsonMainNode = jsonObj.optJSONArray("candidate"); — Muhammad Nasir Rajput, Jul 12 '16 at 06:45
I am getting this error Process: sales.hitech.android.com.parseex1, PID: 25407 java.lang.NullPointerException: Attempt to invoke virtual method 'org.json.JSONArray org.json.JSONObject.optJSONArray(java.lang.String)' on a null object reference — Android enthusiast, Jul 12 '16 at 07:28

score 1 · Answer 1 · answered Jul 12 '16 at 05:54

1

Your problem is that Android is not a JSONArray, it's an object. Use the corresponding method to get JsonObjects.

answered Jul 12 '16 at 05:54

OneCricketeer

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Json parsing through Array in android

1 Answers1