java - Unable to retrieve the value of textfield -

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i newbee in android development. had developed app contains login, credentials must passed in text field , later call webservice. facing issue user , password not getting copied @ required position. please me out. 

    package com.authorwjf.http_get;  import java.io.ioexception; import java.io.inputstream; import java.io.unsupportedencodingexception;  import org.apache.http.httpentity; import org.apache.http.httpresponse; import org.apache.http.client.httpclient; import org.apache.http.client.methods.httppost; import org.apache.http.entity.stringentity; import org.apache.http.impl.client.defaulthttpclient; import org.apache.http.protocol.basichttpcontext; import org.apache.http.protocol.httpcontext;  import android.app.activity; 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 main extends activity implements onclicklistener {      edittext txtusername;     edittext txtpassword;      @override     public void oncreate(bundle savedinstancestate) {          txtusername=(edittext)this.findviewbyid(r.id.edittext1);          txtpassword=(edittext)this.findviewbyid(r.id.edittext2);          super.oncreate(savedinstancestate);         setcontentview(r.layout.main);         findviewbyid(r.id.my_button).setonclicklistener(this);     }      @override     public void onclick(view arg0) {         button b = (button)findviewbyid(r.id.my_button);         b.setclickable(false);         new longrunninggetio().execute();     }      private class longrunninggetio extends asynctask <void, void, string> {          protected string getasciicontentfromentity(httpentity entity) throws illegalstateexception, ioexception {            inputstream in = entity.getcontent();              stringbuffer out = new stringbuffer();              int n = 1;              while (n>0) {                  byte[] b = new byte[4096];                  n =  in.read(b);                  if (n>0) out.append(new string(b, 0, n));              }              return out.tostring();         }          @override         protected string doinbackground(void... params) {              httpclient httpclient = new defaulthttpclient();              httpcontext localcontext = new basichttpcontext();              string user= txtusername.gettext().tostring();             string pass= txtpassword.gettext().tostring();              system.out.println("userrrr"+user);              system.out.println(pass);               //string user="at@ril.com";              //string pass= "123456";              string accesstokenqry = "{"+                       "\"uid\":\""+user+"\","+                       "\"password\":\""+pass+"\","+                       "\"consumptiondeviceid\":\"fder-et3w-3adw2-2erf\","+                       "\"consumptiondevicename\":\"samsung tab\""+                     "}";               httppost httppost = new httppost("http://devssg01.ril.com:8080/v2/dip/auth/login");              httppost.setheader("content-type",                     "application/json");             httppost.setheader("x-api-key",                     "l7xx7914b8704b2d4b029ab9c4b1b9c66dbf");             stringentity input;             try {                 input = new stringentity(accesstokenqry);                 httppost.setentity(input);             } catch (unsupportedencodingexception e1) {                 // todo auto-generated catch block                 e1.printstacktrace();             }                 string text = null;              try {                    httpresponse response = httpclient.execute(httppost, localcontext);                    httpentity entity = response.getentity();                    text = getasciicontentfromentity(entity);              } catch (exception e) {                  return e.getlocalizedmessage();              }              return text;         }             protected void onpostexecute(string results) {             if (results!=null) {                 edittext et = (edittext)findviewbyid(r.id.my_edit);                 et.settext(results);             }             button b = (button)findviewbyid(r.id.my_button);             b.setclickable(true);         }     } }

the logcat output is:

08-10 01:20:23.977: w/dalvikvm(760): threadid=14: thread exiting uncaught exception (group=0x414c4700) 08-10 01:20:23.984: e/androidruntime(760): fatal exception: asynctask #4 08-10 01:20:23.984: e/androidruntime(760): java.lang.runtimeexception: error occured while executing doinbackground() 08-10 01:20:23.984: e/androidruntime(760):  @ android.os.asynctask$3.done(asynctask.java:299) 08-10 01:20:23.984: e/androidruntime(760):  @ java.util.concurrent.futuretask.finishcompletion(futuretask.java:352) 08-10 01:20:23.984: e/androidruntime(760):  @ java.util.concurrent.futuretask.setexception(futuretask.java:219) 08-10 01:20:23.984: e/androidruntime(760):  @ java.util.concurrent.futuretask.run(futuretask.java:239) 08-10 01:20:23.984: e/androidruntime(760):  @ java.util.concurrent.threadpoolexecutor.runworker(threadpoolexecutor.java:1080) 08-10 01:20:23.984: e/androidruntime(760):  @ java.util.concurrent.threadpoolexecutor$worker.run(threadpoolexecutor.java:573) 08-10 01:20:23.984: e/androidruntime(760):  @ java.lang.thread.run(thread.java:841) 08-10 01:20:23.984: e/androidruntime(760): caused by: java.lang.nullpointerexception 08-10 01:20:23.984: e/androidruntime(760):  @ com.authorwjf.http_get.main$longrunninggetio.doinbackground(main.java:66) 08-10 01:20:23.984: e/androidruntime(760):  @ com.authorwjf.http_get.main$longrunninggetio.doinbackground(main.java:1) 08-10 01:20:23.984: e/androidruntime(760):  @ android.os.asynctask$2.call(asynctask.java:287) 08-10 01:20:23.984: e/androidruntime(760):  @ java.util.concurrent.futuretask.run(futuretask.java:234) 08-10 01:20:23.984: e/androidruntime(760):  ... 3 more

you trying initialize edittexts before layout loaded.

if want edittext on layout, must initialize after layout loaded.

here correct code:

@override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.main);         findviewbyid(r.id.my_button).setonclicklistener(this);          txtusername=(edittext)this.findviewbyid(r.id.edittext1);         txtpassword=(edittext)this.findviewbyid(r.id.edittext2);     }

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