android - com.google.gson.JsonSyntaxException when AsyncTask with Parser is called More than once -

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i'm using asynctask retrieve data backend server , parsing using gson parser. i'm getting com.google.gson.jsonsyntaxexception when execute asynctask more once

this parser async

public class parsetask extends asynctask<string, void, jsonobject> {  public jsonobject jsonobject; string url;  @override protected jsonobject doinbackground(string... arg0) {     url = arg0[0];     try {         url url = new url(url);         httpurlconnection connection = (httpurlconnection) url.openconnection();         connection.connect();         jsonparser parser = new jsonparser();         jsonobject = parser.parse(new inputstreamreader((inputstream) connection.getcontent())).getasjsonobject();     } catch (exception e) {         e.printstacktrace();     }     return jsonobject; }  @override protected void onpostexecute(jsonobject json) {     super.onpostexecute(json); }

}

this main activity

public class drillonefragment extends activity {  private static string url = "abc"; private static final string tag_year = "year"; layoutparams params; view view; private jsonobject result; string q; string[] qq = { "2013", "2014" };  @override protected void oncreate(bundle savedinstancestate) {     // todo auto-generated method stub     super.oncreate(savedinstancestate);     setcontentview(r.layout.a);     (int = 0; < 2; i++) {     list<namevaluepair> params = new arraylist<namevaluepair>();     params.add(new basicnamevaluepair(tag_year, qq[i]));     string paramstring = urlencodedutils.format(params, "utf-8");     url += "?" + paramstring;     try {         result = new parsetask().execute(url).get();         log.e(qq[i], result.tostring());     } catch (exception e) {         e.printstacktrace();         }     } }

}

this logcat

08-19 17:14:51.937: w/system.err(14735):   com.google.gson.jsonsyntaxexception: com.google.gson.stream.malformedjsonexception: use jsonreader.setlenient(true) accept malformed json @ line 1 column 6 path $ 08-19 17:14:51.937: w/system.err(14735):    @ com.google.gson.jsonparser.parse(jsonparser.java:65) 08-19 17:14:51.937: w/system.err(14735):    @ com.example.tester.parsetask.doinbackground(parsetask.java:25) 08-19 17:14:51.937: w/system.err(14735):    @ com.example.tester.parsetask.doinbackground(parsetask.java:1) 08-19 17:14:51.937: w/system.err(14735):    @ android.os.asynctask$2.call(asynctask.java:288) 08-19 17:14:51.937: w/system.err(14735):    @ java.util.concurrent.futuretask.run(futuretask.java:237) 08-19 17:14:51.937: w/system.err(14735):    @ android.os.asynctask$serialexecutor$1.run(asynctask.java:231) 08-19 17:14:51.937: w/system.err(14735):    @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1112) 08-19 17:14:51.937: w/system.err(14735):    @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:587) 08-19 17:14:51.937: w/system.err(14735):    @ java.lang.thread.run(thread.java:841) 08-19 17:14:51.937: w/system.err(14735): caused by: com.google.gson.stream.malformedjsonexception: use jsonreader.setlenient(true) accept malformed json @ line 1 column 6 path $ 08-19 17:14:51.937: w/system.err(14735):    @ com.google.gson.stream.jsonreader.syntaxerror(jsonreader.java:1573) 08-19 17:14:51.937: w/system.err(14735):    @ com.google.gson.stream.jsonreader.checklenient(jsonreader.java:1423) 08-19 17:14:51.937: w/system.err(14735):    @ com.google.gson.stream.jsonreader.dopeek(jsonreader.java:546) 08-19 17:14:51.937: w/system.err(14735):    @ com.google.gson.stream.jsonreader.peek(jsonreader.java:429) 08-19 17:14:51.937: w/system.err(14735):    @ com.google.gson.jsonparser.parse(jsonparser.java:60) 08-19 17:14:51.937: w/system.err(14735):    ... 8 more 08-19 17:14:51.937: w/system.err(14735): java.lang.nullpointerexception 08-19 17:14:51.937: w/system.err(14735):    @ com.example.tester.drillonefragment.oncreate(drillonefragment.java:41) 08-19 17:14:51.937: w/system.err(14735):    @ android.app.activity.performcreate(activity.java:5248) 08-19 17:14:51.937: w/system.err(14735):    @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1087) 08-19 17:14:51.937: w/system.err(14735):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2162) 08-19 17:14:51.937: w/system.err(14735):    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2247) 08-19 17:14:51.937: w/system.err(14735):    @ android.app.activitythread.access$800(activitythread.java:141) 08-19 17:14:51.937: w/system.err(14735):    @ android.app.activitythread$h.handlemessage(activitythread.java:1210) 08-19 17:14:51.937: w/system.err(14735):    @ android.os.handler.dispatchmessage(handler.java:102) 08-19 17:14:51.937: w/system.err(14735):    @ android.os.looper.loop(looper.java:136) 08-19 17:14:51.937: w/system.err(14735):    @ android.app.activitythread.main(activitythread.java:5050) 08-19 17:14:51.937: w/system.err(14735):    @ java.lang.reflect.method.invokenative(native method) 08-19 17:14:51.937: w/system.err(14735):    @ java.lang.reflect.method.invoke(method.java:515) 08-19 17:14:51.937: w/system.err(14735):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 08-19 17:14:51.937: w/system.err(14735):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:609) 08-19 17:14:51.937: w/system.err(14735):    @ dalvik.system.nativestart.main(native method)

thanks in advance.

you misused call asynctask class, must instantiate class , define parameters, connect , json objects. remember use motodo onpostexecute () output. may not

result = new parsetask().execute(url).get();

you must following. code works fine me

private class getarticulosparam extends asynctask<string, void, void> {     public getarticulosparam() {         contactlist = new arraylist<hashmap<string, string>>();     }     @override     protected void onpreexecute() {         super.onpreexecute();         // showing progress dialog         pdialog = new progressdialog(mainactivity.this);         pdialog.setmessage("por favor, espere...");         pdialog.setcancelable(true);         pdialog.show();     }     @override     protected void doinbackground(string... arg0) {          // string         // url1="http://pracsysonline.dyndns.org/listaarticulos/consultaparam.php";         string url1 = "http://"+direccion+"/listaarticulos/consultaparam.php";         string param = arg0[0];         list<namevaluepair> params = new arraylist<namevaluepair>();         params.add(new basicnamevaluepair("param", param));         // creating service handler class instance         servicehandler sh = new servicehandler();         // making request url , getting response         string jsonstr =sh.makeservicecall(url1,servicehandler.post,params);         log.d("response: ", "> " + jsonstr);         if (jsonstr != null) {             try {                 // getting json array node                 contacts = new jsonarray(jsonstr);                 // looping through contacts                 (int = 0; < contacts.length(); i++) {                     jsonobject c = contacts.getjsonobject(i);                     string id = c.getstring(tag_desc);                     string name = c.getstring(tag_code);                      hashmap<string, string> contact = new hashmap<string, string>();                      log.e("prueba", img);                     // adding each child node hashmap key => value                     contact.put(tag_desc, id);                     contact.put(tag_code, name);                     contactlist.add(contact);                 }             } catch (jsonexception e) {                 e.printstacktrace();             }         } else {             log.e("servicehandler", "couldn't data url");         }          return null;     }      @override     protected void onpostexecute(void result) {         super.onpostexecute(result);         miadapter = new listviewadapter(mainactivity.this, contactlist);         setlistadapter(miadapter);         pdialog.dismiss();     } }

then class servicehandler

public class servicehandler {  static string response = null; public final static int = 1; public final static int post = 2;  public servicehandler() {  }  /*  * making service call  * @url - url make request  * @method - http request method  * */ public string makeservicecall(string url, int method) {     return this.makeservicecall(url, method, null); }  /*  * making service call  * @url - url make request  * @method - http request method  * @params - http request params  * */ public string makeservicecall(string url, int method,         list<namevaluepair> params) {     try {         // http client         defaulthttpclient httpclient = new defaulthttpclient();         httpentity httpentity = null;         httpresponse httpresponse = null;          // checking http request method type         if (method == post) {             httppost httppost = new httppost(url);             // adding post params             if (params != null) {                 urlencodedformentity encodedentity = new urlencodedformentity(params,"utf-8");                 encodedentity.setcontentencoding(http.utf_8);                 httppost.setentity(encodedentity);                 //httppost.setentity(new urlencodedformentity(params,"utf-8"));             }              httpresponse = httpclient.execute(httppost);          } else if (method == get) {             // appending params url             if (params != null) {                 string paramstring = urlencodedutils                         .format(params, "utf-8");                 url += "?" + paramstring;             }             httpget httpget = new httpget(url);              httpresponse = httpclient.execute(httpget);          }         //codigo pruebna         response = new scanner(httpresponse.getentity().getcontent(),"utf-8").usedelimiter("\\a").next();         /*httpentity = httpresponse.getentity();         response = entityutils.tostring(httpentity,"utf-8");*/      } catch (unsupportedencodingexception e) {         e.printstacktrace();     } catch (clientprotocolexception e) {         e.printstacktrace();     } catch (ioexception e) {         e.printstacktrace();     }      return response;  }

}


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