java - E/Error JSONException: No value for categories in android -


i have json data , tried parse android. faced jsonexception;- no value categories. me

my mainactivity here:-

public class mainactivity extends appcompatactivity implements fragmentdrawer.fragmentdrawerlistener {  //private static string tag = mainactivity.class.getsimplename();  private toolbar mtoolbar; private fragmentdrawer drawerfragment; string data1,data2,data3,data4,data5;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      mtoolbar = (toolbar) findviewbyid(r.id.toolbar);      setsupportactionbar(mtoolbar);     getsupportactionbar().setdisplayshowhomeenabled(true);      drawerfragment = (fragmentdrawer)             getsupportfragmentmanager().findfragmentbyid(r.id.fragment_navigation_drawer);     drawerfragment.setup(r.id.fragment_navigation_drawer, (drawerlayout) findviewbyid(r.id.drawer_layout), mtoolbar);     drawerfragment.setdrawerlistener(this);     // display first navigation drawer view on app launch     displayview(0);     log.d("oncreate method","");      new productsasyntask().execute("http://opencart.codeniques.com/myshop/?route=feed/web_api/product&id=30&key=test123");   }  public class productsasyntask extends asynctask<string,void,void>{      progressdialog dialog;      protected void onpreexecute(){         super.onpreexecute();         log.d("in onpreexceute","");         dialog = new progressdialog(mainactivity.this);         dialog.setmessage("loading, please wait");         dialog.settitle("connecting server");         dialog.show();         dialog.setcancelable(false);     }      protected void doinbackground(string... param){         try{             log.d("in doinbackground","");              httpclient client= new defaulthttpclient();             httppost post = new httppost(param[0]);             httpresponse response = client.execute(post);              int status = response.getstatusline().getstatuscode();              if(status == 200){                 log.d("status",""+status);                  httpentity entity = response.getentity();                 string data = entityutils.tostring(entity);                  jsonobject jsonobject = new jsonobject(data);                 jsonarray jarray = jsonobject.getjsonarray("categories");                  for(int = 0;i < jarray.length();i++){                      jsonobject jsonobject1 = jarray.getjsonobject(i);                      data1 = jsonobject1.getstring("name");                     log.d("hello ",data1);                      jsonobject jsonobject2 = jsonobject1.getjsonobject("children");                      data2 = jsonobject2.getstring("name");                     log.d("hello2 ",data2);                      jsonobject jsonobject3 = jsonobject2.getjsonobject("children_lv3");                      data3 = jsonobject3.getstring("name");                     log.d("hello3 ",data3);                     data4 = jsonobject3.getstring("href");                     log.d("hello4 ",data4);                      data5=jsonobject2.getstring("href");                     log.d("hello5 ",data5);                 }              }         }catch(ioexception e){             log.e("error ioexception :",e.getmessage());         }catch (jsonexception e){             log.e("error jsonexception",e.getmessage());         }             return null;     }      protected void onpostexecute(void avoid) {         super.onpostexecute(avoid);         dialog.dismiss();     } }  @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.menu_main, menu);     return true; }  @override public boolean onoptionsitemselected(menuitem item) {     // handle action bar item clicks here. action bar     // automatically handle clicks on home/up button, long     // specify parent activity in androidmanifest.xml.     int id = item.getitemid();      //noinspection simplifiableifstatement     if (id == r.id.action_settings) {         return true;     }      if(id == r.id.action_search){         toast.maketext(getapplicationcontext(), "search action selected!", toast.length_short).show();         return true;     }      return super.onoptionsitemselected(item); }  @override public void ondraweritemselected(view view, int position) {     displayview(position); }  private void displayview(int position) {     fragment fragment = null;     string title = getstring(r.string.app_name);     switch (position) {         case 0:             fragment = new homefragment();            title = getstring(r.string.title_home);             break;         case 1:             fragment = new friendsfragment();             title = getstring(r.string.title_friends);             break;         case 2:             fragment = new messagesfragment();             title = getstring(r.string.title_messages);             break;         default:             break;     }      if (fragment != null) {         fragmentmanager fragmentmanager = getsupportfragmentmanager();         fragmenttransaction fragmenttransaction = fragmentmanager.begintransaction();         fragmenttransaction.replace(r.id.container_body, fragment);         fragmenttransaction.commit();          // set toolbar title         getsupportactionbar().settitle(title);     } }

}

i new in android developing please me. in advance!

its because jsondata doesnt contain categories jsonarray

so check first this:-

if(jsonobject.has("categories"))                 {                     jsonarray jarray = jsonobject.getjsonarray("categories");  for(int = 0;i < jarray.length();i++){                      jsonobject jsonobject1 = jarray.getjsonobject(i);                      data1 = jsonobject1.getstring("name");                     log.d("hello ",data1);                      jsonobject jsonobject2 = jsonobject1.getjsonobject("children");                      data2 = jsonobject2.getstring("name");                     log.d("hello2 ",data2);                      jsonobject jsonobject3 = jsonobject2.getjsonobject("children_lv3");                      data3 = jsonobject3.getstring("name");                     log.d("hello3 ",data3);                     data4 = jsonobject3.getstring("href");                     log.d("hello4 ",data4);                      data5=jsonobject2.getstring("href");                     log.d("hello5 ",data5);                 }                 }

try checking json data first, when see jsonexception;- no value for


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