android - JSON Parsing Error on Looping and others -

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i having hard time parsing through following json output:

{    "status":"success",    "data":[       {          "question_id":"1",          "category_id":"1",          "question":"jjj",          "answer":"ffdf",          "created_on":"16 apr, 2013 06:52",          "modified_on":"",          "user_id":"1",          "category_name":"career",          "is_answered":true       },       {          "question_id":"3",          "category_id":"1",          "question":"ssssssssssss",          "answer":null,          "created_on":"23 apr, 2013 15:12",          "modified_on":"",          "user_id":"1",          "category_name":"career",          "is_answered":false       }    ],    "message":null }

the code have tried is:

jsonobject getquestion; public class getquestionanswers extends asynctask<void, void, void> {     progressdialog progress;      @override     protected void onpreexecute() {         super.onpreexecute();         progress = new progressdialog(questionstack.this);         progress.setprogressstyle(progressdialog.style_spinner);         progress.setmessage("updating information ...");         progress.show();     }      @override     protected void doinbackground(void... params) {         userfunctions users = new userfunctions();         getquestion = users.getallquestion(question_user_id);         return null;     }      @override     protected void onpostexecute(void result) {         try {             jsonarray data = getquestion.getjsonarray("data");             log.i("data", data.tostring());             (int = 0; < data.length(); i++) {                 jsonobject goaccess = data.getjsonobject(i);                 question_json = goaccess.getstring("question");                 answer_json = goaccess.getstring("answer");                 log.i("question", question_json);                 log.i("answer", answer_json);                 question_answer_view.settext(question_json + answer_json);             }         } catch (jsonexception e) {             e.printstacktrace();         }         progress.dismiss();         super.onpostexecute(result);     } }

the error shows:

04-25 18:54:26.234: w/system.err(2945):     @ org.json.json.typemismatch(json.java:100) 04-25 18:54:26.234: w/system.err(2945):     @ org.json.jsonobject.getjsonarray(jsonobject.java:548) 04-25 18:54:26.244: w/system.err(2945):     @ com.example.btshome.questionstack$getquestionanswers.onpostexecute(questionstack.java:80) 04-25 18:54:26.244: w/system.err(2945):     @ com.example.btshome.questionstack$getquestionanswers.onpostexecute(questionstack.java:1) 04-25 18:54:26.244: w/system.err(2945):     @ android.os.asynctask.finish(asynctask.java:631) 04-25 18:54:26.244: w/system.err(2945):     @ android.os.asynctask.access$600(asynctask.java:177) 04-25 18:54:26.264: w/system.err(2945):     @ android.os.asynctask$internalhandler.handlemessage(asynctask.java:644) 04-25 18:54:26.304: w/system.err(2945):     @ android.os.handler.dispatchmessage(handler.java:99) 04-25 18:54:26.304: w/system.err(2945):     @ android.os.looper.loop(looper.java:137) 04-25 18:54:26.304: w/system.err(2945):     @ android.app.activitythread.main(activitythread.java:4745) 04-25 18:54:26.304: w/system.err(2945):     @ java.lang.reflect.method.invokenative(native method) 04-25 18:54:26.314: w/system.err(2945):     @ java.lang.reflect.method.invoke(method.java:511) 04-25 18:54:26.314: w/system.err(2945):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786) 04-25 18:54:26.334: w/system.err(2945):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553) 04-25 18:54:26.334: w/system.err(2945):     @ dalvik.system.nativestart.main(native method)

the main aim of code load set of question , answers textview, not achieving.

try this...      jsonobject js = new jsonobject(jsonstring);     (int = 0; < js.length(); i++) {         jsonarray data = js.getjsonarray("data");         (int j = 0; j < data.length(); j++) {         jsonobject goaccess = data.getjsonobject(j);         string question_json = goaccess.getstring("question");         string answer_json = goaccess.getstring("answer");             if(question_json ==null)                 question_json = "";             if(answer_json==null)                 answer_json  = "";         log.i("question", question_json);         log.i("answer", answer_json);         question_answer_view.settext(question_json + answer_json);         }      }

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