android client calls webservice reported abnormal, how it

 package Telephone.test; 

import org.ksoap2.SoapEnvelope; 
import org.ksoap2.serialization.SoapObject; 
import org.ksoap2.serialization.SoapSerializationEnvelope; 
import org.ksoap2.transport.HttpTransportSE; 

import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 
public class TelephoneActivity extends Activity {
/ ** Called when the activity is first created. * / 
private EditText phoneSecEditText; 
private TextView resultView; 
private Button queryButton; 
public void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState); 
setContentView (R.layout.main); 
queryButton = (Button) findViewById (R.id.query_btn); 
queryButton.setOnClickListener (new OnClickListener () {
public void onClick (View v) {

String username = phoneSecEditText.getText () toString () trim ();.. 
getRemoteInfo (username); 
} 
}); 

} 
public void getRemoteInfo (String username) {
/ / Namespace 
String nameSpace = "http://tempuri.org/"; 
/ / Method name 
 callString methodName = "GetUserList"; 
/ / EndPoint 
String endPoint = "http://192.168.0.100:8081/WebService.asmx"; 
/ / SOAP Action 
String soapAction = "http://tempuri.org/GetUserList"; 

/ / Specify WebService namespace and method name to call 
SoapObject rpc = new SoapObject (nameSpace, methodName); 

/ / Set the required incoming call WebService interface requires two parameters mobileCode, userId 
rpc.addProperty ("username", username); 


/ / Generate method call WebService SOAP request message, and specify the version of SOAP 
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope (SoapEnvelope.VER11); 

envelope.bodyOut = rpc; 
/ / Set whether the call is dotNet development WebService 
envelope.dotNet = true; 
/ / Equivalent to envelope.bodyOut = rpc; 
envelope.setOutputSoapObject (rpc); 

HttpTransportSE transport = new HttpTransportSE (endPoint); 
try {
/ / Call WebService 
transport.call (soapAction, envelope); 
} Catch (Exception e) {
e.printStackTrace (); 
} 

/ / Get the returned data 
SoapObject object = (SoapObject) envelope.bodyIn; 
/ / Get the results returned 
String result = object.getProperty (0) toString ();. 
/ / String result = "lijian"; 

/ / Display the results returned by WebService in TextView in 
resultView.setText (result); 
} 
} 

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Tip this error:
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Null pointer exception: phoneSecEditText not only defines the assignment, so in line 27 when this will be reported with a null pointer exception.

 String username = phoneSecEditText.getText (). toString (). trim () ;/ / here phoneSecEditText not assign it