android - SignPost error using OAuth and get Error parsing data org.json.JSONException: End of input at character 0 of -

i accessing magento backend android app using consumer. , getting following response magento after authentication done manually.

object(zend_http_response)#16 (5) { ["version":protected] => string(3) "1.1"  ["code":protected] => int(200)  ["message":protected] => string(2) "ok" ["headers":protected] => array(6) { ["date"] => string(29) "mon, 10 mar 2014 05:55:59 gmt" ["server"] => string(45) "apache/2.4.7 (win32) openssl/1.0.1e php/5.5.6" ["x-powered-by"] => string(9) "php/5.5.6" ["connection"] => string(5) "close" ["transfer-encoding"] => string(7) "chunked" ["content-type"] => string(31) "application/json; charset=utf-8" } ["body":protected] => string(27184) "6a23 {"16":         {"entity_id":"16","attribute_set_id":"38","type_id":"simple","sku":"n2610","model":"2610","dimension":"4.1 x 1.7 x 0.7 inches ","description":"something"}}0"} 

how parse above response in android app using signpost jar.in android using signpost java oauth library , there manually passing consumer key,consumer secret key,access token, , access token secret. java file below

package com.example.dukano;  import java.io.bufferedreader; import java.io.console; import java.io.inputstream; import java.io.inputstreamreader; import java.io.unsupportedencodingexception;  import oauth.signpost.oauthconsumer; import oauth.signpost.commonshttp.commonshttpoauthconsumer;  import org.apache.http.httpentity; import org.apache.http.client.clientprotocolexception; import org.apache.http.client.methods.httpget; import org.apache.http.impl.client.defaulthttpclient; import org.apache.http.util.entityutils; import org.json.jsonexception; import org.json.jsonobject;  import android.content.context; import android.util.log; import android.widget.toast;  public class jsonparser { static inputstream = null; static jsonobject jobj = null; static string json = ""; oauthconsumer  consumer;  public jsonparser(){     consumer = new commonshttpoauthconsumer("4fd325e8273924df5f48f978a3f8e556","46be40812031f40645788ee90894efbe");     consumer.settokenwithsecret("ca269640a3629a1d65af59d16058d91c", "f23ad8ba9646dbb28be5255c9faca0e1"); } //constructor  public jsonobject getjsonfromurl(string url) {     try     {         defaulthttpclient httpclient = new defaulthttpclient();         httpget request = new httpget(url);         request.setheader("accept", "text/xml");         consumer.sign(request);         org.apache.http.httpresponse response = httpclient.execute(request); // error caught here           httpentity httpentity = response.getentity();          //string responsebody= entityutils.tostring(httpentity);         //system.out .println(responsebody+"hello world");         = httpentity.getcontent();      } catch (unsupportedencodingexception e) {         e.printstacktrace();     } catch (clientprotocolexception e) {         e.printstacktrace();     } catch (exception e) {         e.printstacktrace();     }       try     {         bufferedreader reader = new bufferedreader(new inputstreamreader(is, "iso-8859-1"), 8);         stringbuilder sb = new stringbuilder();         string line = null;         while ((line = reader.readline()) != null) {             sb.append(line + "\n");         }          is.close();         json = sb.tostring();         log.i("json", json);     }     catch(exception e)     {}      try {             jobj = new jsonobject(json);   //showing parse error here                 } catch (jsonexception e) {             log.e("my json parser", "error parsing data " + e.tostring());         }     return jobj;     } } 

i found in debug mode

org.apache.http.httpresponse response = httpclient.execute(request); 

above statement when execute goes try catch following :

        try {             jobj = new jsonobject(json);   //showing parse error here                 } catch (jsonexception e) {             log.e("my json parser", "error parsing data " + e.tostring());         }