java - Array json cant go for my list view -

my listview not display json array titulo. receiving following error on logcat

 06-19 14:02:12.750    6497-6518/com.eu.agendamarinhagrande e/json parser﹕ error parsing data org.json.jsonexception: value  of type java.lang.string cannot converted jsonobject 

the follwoing mainactivity class

   package com.eu.agendamarinhagrande;  import android.annotation.targetapi; import android.app.progressdialog; import android.content.intent; import android.os.asynctask; import android.os.build; import android.support.v7.app.actionbar; import android.support.v7.app.actionbaractivity; import android.os.bundle; import android.util.log; import android.view.menu; import android.view.menuitem; import android.view.view; import android.widget.adapterview; import android.widget.listadapter; import android.widget.listview; import android.widget.simpleadapter; import android.widget.textview;  import com.eu.agendamarinhagrande.jsonparser; import com.eu.agendamarinhagrande.r;  import org.apache.http.namevaluepair; import org.json.jsonarray; import org.json.jsonexception; import org.json.jsonobject;  import java.util.arraylist; import java.util.hashmap; import java.util.list;   public class mainactivity extends actionbaractivity {      // progress dialog     private progressdialog pdialog;      // creating json parser object     jsonparser jparser = new jsonparser();      arraylist<hashmap<string, string>> empresalist;       // url products list     private static string url_all_empresas = "http://www.grifin.pt/projectoamg/conexao.php";      // json node names       private static final string tag_titulo = "titulo";       // products jsonarray     string resultado = null;      listview lista;      @targetapi(build.version_codes.honeycomb)     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_main);          // hashmap para el listview         empresalist = new arraylist<hashmap<string, string>>();         new loadallproducts().execute();         // cargar los productos en el background thread          lista = (listview) findviewbyid(r.id.listview);          actionbar actionbar = getsupportactionbar();         actionbar.setdisplayhomeasupenabled(true);      }//fin oncreate       class loadallproducts extends asynctask<string, string, string> {          /**          * antes de empezar el background thread show progress dialog          */         @override         protected void onpreexecute() {             super.onpreexecute();             pdialog = new progressdialog(mainactivity.this);             pdialog.setmessage("a carregar eventos. por favor espere...");             pdialog.setindeterminate(false);             pdialog.setcancelable(false);             pdialog.show();         }          /**          * obteniendo todos los productos          */         protected string doinbackground(string... args) {             // building parameters             list params = new arraylist();             // getting json string url           jsonobject json = jparser.makehttprequest(url_all_empresas, "get", params);             stringbuilder sb = new stringbuilder();             // check log cat json reponse             log.d("all products: ", url_all_empresas.tostring());             resultado = sb.tostring();             try {                 // checking success tag                  // products found                 // getting array of products                  jsonarray arrayjson = new jsonarray(resultado);                 (int = 0; i<arrayjson.length();i++){                        // storing each json item in variable                     jsonobject c = arrayjson.getjsonobject(i);                     string titulo = c.getstring(tag_titulo);                       // creating new hashmap                     hashmap map = new hashmap();                      // adding each child node hashmap key => value                     map.put(tag_titulo, titulo);                       empresalist.add(map);                 }              } catch (jsonexception e) {                 e.printstacktrace();             }             return null;         }          protected void onpostexecute(string file_url) {             // dismiss dialog after getting products             pdialog.dismiss();             // updating ui background thread             runonuithread(new runnable() {                 public void run() {                     /**                      * updating parsed json data listview                      * */                     listadapter adapter = new simpleadapter(                             mainactivity.this,                             empresalist,                             r.layout.single_post,                             new string[]{                                     tag_titulo                              },                             new int[]{                                     r.id.single_post_tv_id                              });                     // updating listview                     //setlistadapter(adapter);                     lista.setadapter(adapter);                 }             });          }     } } 

please me understand problem causing json not displayed on listview.

this worked me. commented out code make work,

public class test extends actionbaractivity {      // progress dialog     private progressdialog pdialog;      // creating json parser object     // jsonparser jparser = new jsonparser();      arraylist<hashmap<string, string>> empresalist;       // url products list     private static string url_all_empresas = "http://www.grifin.pt/projectoamg/conexao.php";      // json node names       private static final string tag_titulo = "titulo";       // products jsonarray     string resultado = null;      listview lista;      @targetapi(build.version_codes.honeycomb)     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.activity_test);          // hashmap para el listview         empresalist = new arraylist<hashmap<string, string>>();         new download().execute();         // cargar los productos en el background thread          lista = (listview) findviewbyid(r.id.listview);         // actionbar actionbar = getsupportactionbar();        // actionbar.setdisplayhomeasupenabled(true);      }//fin oncreate       public class download extends asynctask<void, void, string> {          @override         protected string doinbackground(void... params) {             string out = null;              try {                 defaulthttpclient httpclient = new defaulthttpclient();                  final httpparams httpparameters = httpclient.getparams();                  httpconnectionparams.setconnectiontimeout(httpparameters, 15000);                 httpconnectionparams.setsotimeout(httpparameters, 15000);                  httpget httppost = new httpget(url_all_empresas);                  httpresponse httpresponse = httpclient.execute(httppost);                 httpentity httpentity = httpresponse.getentity();                  out = entityutils.tostring(httpentity, http.utf_8);              } catch (unsupportedencodingexception e) {                 e.printstacktrace();             } catch (clientprotocolexception e) {                 e.printstacktrace();             } catch (ioexception e) {                 e.printstacktrace();             }              return out;         }       @override     protected void onpostexecute(string result) {         super.onpostexecute(result);          arraylist<string> list = new arraylist<>();          try {             jsonarray jsonarray = new jsonarray(result);             (int = 0; < jsonarray.length(); i++) {                 jsonobject jsa = jsonarray.getjsonobject(i);                 string str = jsa.getstring("titulo");                 log.e("tag", str);                  string s1 = normalizer.normalize(str, normalizer.form.nfkd);                 string regex = pattern.quote("[\\p{incombiningdiacriticalmarks}\\p{islm}\\p{issk}]+");                  str = new string(s1.replaceall(regex, "").getbytes("ascii"), "ascii");                  list.add(str);             }              arrayadapter adapter = new arrayadapter<>(test.this, android.r.layout.simple_list_item_1, list);              // updating listview             //setlistadapter(adapter);             lista.setadapter(adapter);          } catch (exception e) {             e.printstacktrace();         }       }     } }