java - Getting an error when connecting from android to PHP server -

i have android application project connect php server write in codeigniter.

my jsonparser is:

package com.example.com.tourism;  import java.io.bufferedreader; import java.io.ioexception; import java.io.inputstream; import java.io.inputstreamreader; import java.io.unsupportedencodingexception; import java.util.list;  import org.apache.http.httpentity; import org.apache.http.httpresponse; import org.apache.http.namevaluepair; import org.apache.http.client.clientprotocolexception; import org.apache.http.client.entity.urlencodedformentity; import org.apache.http.client.methods.httpget; import org.apache.http.client.methods.httppost; import org.apache.http.client.utils.urlencodedutils; import org.apache.http.impl.client.defaulthttpclient; import org.json.jsonexception; import org.json.jsonobject;  import android.util.log;  public class jsonparser {         static inputstream = null;        static jsonobject jobj = null;        static string json = "";         // constructor        public jsonparser() {         }         // function json url        // making http post or method        public jsonobject makehttprequest(string url, string method,                list<namevaluepair> params) {             // making http request            try {                 // check request method                if(method == "post"){                    // request method post                    // defaulthttpclient                    defaulthttpclient httpclient = new defaulthttpclient();                    httppost httppost = new httppost(url);                    httppost.setentity(new urlencodedformentity(params));                     httpresponse httpresponse = httpclient.execute(httppost);                    httpentity httpentity = httpresponse.getentity();                     = httpentity.getcontent();                  }else if(method == "get"){                    // request method                    defaulthttpclient httpclient = new defaulthttpclient();                    string paramstring = urlencodedutils.format(params, "utf-8");                    url += "?" + paramstring;                    httpget httpget = new httpget(url);                     httpresponse httpresponse = httpclient.execute(httpget);                    httpentity httpentity = httpresponse.getentity();                    = httpentity.getcontent();                }                       } catch (unsupportedencodingexception e) {                e.printstacktrace();            } catch (clientprotocolexception e) {                e.printstacktrace();            } catch (ioexception 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();            } catch (exception e) {                log.e("buffer error", "error converting result " + e.tostring());            }             // try parse string json object            try {                jobj = new jsonobject(json);            } catch (jsonexception e) {                log.e("json parser", "error parsing data " + e.tostring());            }             // return json string            return jobj;         }     } 

and activity java code connect server is

package com.example.com.tourism;  import java.util.arraylist; import java.util.list;  import org.apache.http.namevaluepair; import org.apache.http.message.basicnamevaluepair; import org.json.jsonexception; import org.json.jsonobject;   import android.app.activity; import android.app.progressdialog; import android.content.intent; import android.os.asynctask; import android.os.bundle; import android.util.log; import android.view.view; import android.view.view.onclicklistener; import android.widget.button; import android.widget.edittext;  public class signup extends activity {      edittext first,last,birth ,pass;     private progressdialog pdialog;     private static string url_create_user = "http://10.0.2.2/tourism/index.php/site/register";     jsonparser jsonparser = new jsonparser();     private static final string tag_success = "success";     @override         protected void oncreate(bundle savedinstancestate) {             super.oncreate(savedinstancestate);             setcontentview(r.layout.sign_up);              button signup=(button)findviewbyid(r.id.sign_up);              first =(edittext) findviewbyid(r.id.edfname);             last =(edittext) findviewbyid(r.id.edlname);             pass =(edittext) findviewbyid(r.id.edpass);             signup.setonclicklistener(new onclicklistener() {                  @override                 public void onclick(view v) {                     // todo auto-generated method stub                     new createnewuser().execute();                 }             });      }      class createnewuser extends asynctask<string, string, string> {          /**          * before starting background thread show progress dialog          * */         @override         protected void onpreexecute() {             super.onpreexecute();             pdialog = new progressdialog(signup.this);             pdialog.setmessage("creating user..");             pdialog.setindeterminate(false);             pdialog.setcancelable(true);             pdialog.show();         }          /**          * creating product          * */         protected string doinbackground(string... args) {             string name = first.gettext().tostring();             string price = last.gettext().tostring();             string description = pass.gettext().tostring();              // building parameters             list<namevaluepair> params = new arraylist<namevaluepair>();             params.add(new basicnamevaluepair("first_name", name));             params.add(new basicnamevaluepair("last_name", price));             params.add(new basicnamevaluepair("password", description));              // getting json object             // note create product url accepts post method             jsonobject json = jsonparser.makehttprequest(url_create_user,                     "post", params);              // check log cat fro response             log.d("create response", json.tostring());              // check success tag             try {                 int success = json.getint(tag_success);                  if (success == 1) {                     // created product                     intent = new intent(getapplicationcontext(), mainactivity.class);                     startactivity(i);                      // closing screen                     finish();                 } else {                     // failed create product                 }             } catch (jsonexception e) {                 e.printstacktrace();             }              return null;         }      }                /**          * after completing background task dismiss progress dialog          * **/         protected void onpostexecute(string file_url) {             // dismiss dialog once done             pdialog.dismiss();         }       } 

and error in log cat

07-07 11:30:44.159: e/json parser(20514): error parsing data org.json.jsonexception: value <!doctype of type java.lang.string cannot converted jsonobject 07-07 11:30:44.189: w/dalvikvm(20514): threadid=11: thread exiting uncaught exception (group=0x40a71930) 07-07 11:30:44.229: e/androidruntime(20514): fatal exception: asynctask #1 07-07 11:30:44.229: e/androidruntime(20514): java.lang.runtimeexception: error occured while executing doinbackground() 07-07 11:30:44.229: e/androidruntime(20514):    @ android.os.asynctask$3.done(asynctask.java:299) 07-07 11:30:44.229: e/androidruntime(20514):    @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:352) 07-07 11:30:44.229: e/androidruntime(20514):    @ java.util.concurrent.futuretask.setexception(futuretask.java:219) 07-07 11:30:44.229: e/androidruntime(20514):    @ java.util.concurrent.futuretask.run(futuretask.java:239) 07-07 11:30:44.229: e/androidruntime(20514):    @ android.os.asynctask$serialexecutor$1.run(asynctask.java:230) 07-07 11:30:44.229: e/androidruntime(20514):    @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1080) 07-07 11:30:44.229: e/androidruntime(20514):    @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:573) 07-07 11:30:44.229: e/androidruntime(20514):    @ java.lang.thread.run(thread.java:856) 07-07 11:30:44.229: e/androidruntime(20514): caused by: java.lang.nullpointerexception 07-07 11:30:44.229: e/androidruntime(20514):    @ com.example.com.tourism.signup$createnewuser.doinbackground(signup.java:98) 07-07 11:30:44.229: e/androidruntime(20514):    @ com.example.com.tourism.signup$createnewuser.doinbackground(signup.java:1) 07-07 11:30:44.229: e/androidruntime(20514):    @ android.os.asynctask$2.call(asynctask.java:287) 07-07 11:30:44.229: e/androidruntime(20514):    @ java.util.concurrent.futuretask.run(futuretask.java:234) 07-07 11:30:44.229: e/androidruntime(20514):    ... 4 more 07-07 11:30:44.429: i/choreographer(20514): skipped 49 frames!  application may doing work on main thread. 07-07 11:30:44.779: i/choreographer(20514): skipped 222 frames!  application may doing work on main thread. 07-07 11:30:45.069: i/choreographer(20514): skipped 149 frames!  application may doing work on main thread. 07-07 11:30:45.369: i/choreographer(20514): skipped 194 frames!  application may doing work on main thread. 07-07 11:30:45.459: i/choreographer(20514): skipped 50 frames!  application may doing work on main thread. 07-07 11:30:46.019: e/windowmanager(20514): activity com.example.com.tourism.signup has leaked window com.android.internal.policy.impl.phonewindow$decorview{40d743a8 v.e..... r.....id 0,0-304,96} added here 07-07 11:30:46.019: e/windowmanager(20514): android.view.windowleaked: activity com.example.com.tourism.signup has leaked window com.android.internal.policy.impl.phonewindow$decorview{40d743a8 v.e..... r.....id 0,0-304,96} added here 07-07 11:30:46.019: e/windowmanager(20514):     @ android.view.viewrootimpl.<init>(viewrootimpl.java:354) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.view.windowmanagerglobal.addview(windowmanagerglobal.java:216) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.view.windowmanagerimpl.addview(windowmanagerimpl.java:69) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.app.dialog.show(dialog.java:281) 07-07 11:30:46.019: e/windowmanager(20514):     @ com.example.com.tourism.signup$createnewuser.onpreexecute(signup.java:75) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.os.asynctask.executeonexecutor(asynctask.java:586) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.os.asynctask.execute(asynctask.java:534) 07-07 11:30:46.019: e/windowmanager(20514):     @ com.example.com.tourism.signup$1.onclick(signup.java:57) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.view.view.performclick(view.java:4204) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.view.view$performclick.run(view.java:17355) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.os.handler.handlecallback(handler.java:725) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.os.handler.dispatchmessage(handler.java:92) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.os.looper.loop(looper.java:137) 07-07 11:30:46.019: e/windowmanager(20514):     @ android.app.activitythread.main(activitythread.java:5041) 07-07 11:30:46.019: e/windowmanager(20514):     @ java.lang.reflect.method.invokenative(native method) 07-07 11:30:46.019: e/windowmanager(20514):     @ java.lang.reflect.method.invoke(method.java:511) 07-07 11:30:46.019: e/windowmanager(20514):     @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:793) 07-07 11:30:46.019: e/windowmanager(20514):     @ com.android.internal.os.zygoteinit.main(zygoteinit.java:560) 07-07 11:30:46.019: e/windowmanager(20514):     @ dalvik.system.nativestart.main(native method) 

i don't know problem is, please me code incorrect ??? if 1 have correct code please give me using codeigniter php , code call above

function register_get()     {         $json = array('status' => false );         if($this->input->post()==null){             $this -> response($json, 200);             }          $firstname = $this->post("first_name");         $lastname = $this->post("last_name");         $password = $this->post("password");         if(!$firstname || !$lastname || !$password){             $json['status'] = "wrong insert";             $this -> response($json, 200);         }          $this->load->model('data_model');         $result = $this->data_model->search($firstname, $lastname);          if($result)         {             $this->data_model->insert($firstname,$lastname,$password);             $json['status'] = true;          }         // here if false..         $this -> response($json, 200);     } 

there issues php. not passing json. need change script encode array json.

$result = json_encode($json)

returning actual json help. make sure not returning html either. java trying parse json response, responding <!doctype...