Send data from Android to Webservice to be inserted in my database -

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i'm trying send few variables(or data) registration webservice android throught "httppost" method. here's code.

httpclient httpclient = new defaulthttpclient(); httppost httppost = new httppost("http://mywebsitename.com/webservice/register.php"); try {  list<namevaluepair> namevaluepairs = new arraylist<namevaluepair>(4);  namevaluepairs.add(new basicnamevaluepair("fname", et3.gettext().tostring()));  namevaluepairs.add(new basicnamevaluepair("lname", et4.gettext().tostring()));  namevaluepairs.add(new basicnamevaluepair("userid", et5.gettext().tostring()));  namevaluepairs.add(new basicnamevaluepair("pass", et6.gettext().tostring()));  httppost.setentity(new urlencodedformentity(namevaluepairs));  httpclient.execute(httppost);   } catch (clientprotocolexception e) {                          // todo auto-generated catch block  } catch (ioexception e) {                          // todo auto-generated catch block }

following register.php file code.

<?php $host = "localhost";  $user = "myusername";  $pass = "mypass"; $connection = mysql_connect($host,$user,$pass) or die (mysql_errno().": ".mysql_error()."<br>");  $fname = $_post['fname']; $lname = $_post['lname']; $userid = $_post['userid']; $pass = $_post['pass'];  $db_select=mysql_select_db("the_db"); if(!$db_select){     die(mysql_error());     echo "error"; }  $query= "insert users(fname, lname, userid, pass) values ('{$fname}', '{$lname}', '{$userid}', '{$pass}'); " ;  if($medo=mysql_query($query)){     header("localhost/filename");     exit; }else{     echo"<p> error</p>";     die(mysql_error()); }

when try run it, gives me error. says on device "yourapp has stopped working". possibly nullpointer exception or that. don't know if correct way send simple variables names , passwords etc. register.php. can tell me problem here?

please have @ logcat output. should @ line in class got exception. post logcat output here if need help. recommend take @ android asynchronous http client. simplifies http communication. example of http post:

asynchttpclient client = new asynchttpclient(); requestparams rp = new requestparams(); rp.put("fname", et3.gettext().tostring()); rp.put("lname", et4.gettext().tostring()); rp.put("userid", et5.gettext().tostring()); rp.put("pass", et6.gettext().tostring());  client.post("http://mywebsitename.com/webservice/register.php", rp, new asynchttpresponsehandler() {     @override     public final void onsuccess(string response) {         // handle response here     }      @override     public void onfailure(throwable e, string response) {         // went wrong     }                });

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