php - Null exception in httprequest -

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i trying values form mysql(xampp) database not working database name meeting_planner , table name participant 

try {                  httppost httppost;                  httpclient httpclient;                  httpclient = new defaulthttpclient();                  httppost = new httppost(                  "http://10.10.10.159/my_folder_inside_htdocs/getdata.php");                  system.out.println("after url");                  responsehandler<string> responsehandler = new basicresponsehandler();                  system.out.println("after response handler");                   final string response = httpclient.execute(httppost,                          responsehandler);                      system.out.println("the response "+response);                   log.e("pass 1", "connection success ");              } catch (exception e) {                   e.printstacktrace();              }

getdata.php code here 

<?php       mysql_connect("localhost","admin","admin"); // host, username, password...     mysql_select_db("meeting_planner"); // db name...       $q=mysql_query("select * participant");      while($row=mysql_fetch_assoc($q))              $json_output[]=$row;            print(json_encode($json_output));      mysql_close();  ?>

the response variable null in result of system.out.println("response"+response); log cat here 

android.os.networkonmainthreadexception  @ android.os.strictmode$androidblockguardpolicy.onnetwork(strictmode.java:1145)  @ libcore.io.blockguardos.connect(blockguardos.java:84)  @ libcore.io.iobridge.connecterrno(iobridge.java:127)  @ libcore.io.iobridge.connect(iobridge.java:112)  @ java.net.plainsocketimpl.connect(plainsocketimpl.java:192)  @ java.net.plainsocketimpl.connect(plainsocketimpl.java:459)  @ java.net.socket.connect(socket.java:843)  @ org.apache.http.conn.scheme.plainsocketfactory.connectsocket(plainsocketfactory.java:119)  @

org.apache.http.impl.conn.defaultclientconnectionoperator.openconnection(defaultclientconnectionopera

tor.java:144)

at org.apache.http.impl.conn.abstractpoolentry.open(abstractpoolentry.java:164)  @ org.apache.http.impl.conn.abstractpooledconnadapter.open(abstractpooledconnadapter.java:119)  @ org.apache.http.impl.client.defaultrequestdirector.execute(defaultrequestdirector.java:360)  @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:555)  @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:653)  @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:627)  @ org.apache.http.impl.client.abstracthttpclient.execute(abstracthttpclient.java:616)  @ com.example.androidmeetingplanner.invite.addlisteneronbutton(invite.java:130)  @ com.example.androidmeetingplanner.invite.oncreate(invite.java:39)  @ android.app.activity.performcreate(activity.java:5231)  @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1087)  @ android.app.activitythread.performlaunchactivity(activitythread.java:2159)  @ android.app.activitythread.handlelaunchactivity(activitythread.java:2245)  @ android.app.activitythread.access$800(activitythread.java:135)  @ android.app.activitythread$h.handlemessage(activitythread.java:1196)  @ android.os.handler.dispatchmessage(handler.java:102)  @ android.os.looper.loop(looper.java:136)  @ android.app.activitythread.main(activitythread.java:5017)  @ java.lang.reflect.method.invokenative(native method)

you getting networkonmainthreadexception. please use asynctask make httprequest following:

    private class httpgetter extends asynctask<void, void, void> {              @override             protected void doinbackground(url... urls) {                 try {                     httpclient httpclient = new defaulthttpclient();                     httppost httppost= new httppost(          "http://10.10.10.159/my_folder_inside_htdocs/getdata.php");                     system.out.println("after url");                     responsehandler<string> responsehandler = new basicresponsehandler();                     system.out.println("after response handler");                     string response = httpclient.execute(httppost,responsehandler);                     system.out.println("the response "+response);                     log.e("pass 1", "connection success ");             } catch (exception e) {               e.printstacktrace();             }                return null;          } }

and in activity write following code execute it

    httpgetter getter = new httpgetter();     getter.execute(null,null);

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