java - android.webkit.WebView cannot be cast to android.widget.Button -

i working on gui inside of app. had crappy contained of basic stuff test java functions in. after had functions , running redisgned gui using graphical editor in eclipse. next time ran app had android.webkit.webview cannot cast android.widget.button in logcat. didn't change in java , declarations in gui same far can tell. can revert gui crappy version doesn't me much. hope on here can me find problem. have posted xml, java, , logcat.

05-09 13:25:19.756: e/androidruntime(10424): fatal exception: main 05-09 13:25:19.756: e/androidruntime(10424): java.lang.runtimeexception: unable start activity componentinfo{com.example.dcc/com.example.dcc.actionitem}:  java.lang.classcastexception: android.webkit.webview cannot cast android.widget.button 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2059) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.activitythread.handlelaunchactivity(activitythread.java:2084) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.activitythread.access$600(activitythread.java:130) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.activitythread$h.handlemessage(activitythread.java:1195) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.os.handler.dispatchmessage(handler.java:99) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.os.looper.loop(looper.java:137) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.activitythread.main(activitythread.java:4745) 05-09 13:25:19.756: e/androidruntime(10424):    @ java.lang.reflect.method.invokenative(native method) 05-09 13:25:19.756: e/androidruntime(10424):    @ java.lang.reflect.method.invoke(method.java:511) 05-09 13:25:19.756: e/androidruntime(10424):    @ com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:786) 05-09 13:25:19.756: e/androidruntime(10424):    @ com.android.internal.os.zygoteinit.main(zygoteinit.java:553) 05-09 13:25:19.756: e/androidruntime(10424):    @ dalvik.system.nativestart.main(native method) 05-09 13:25:19.756: e/androidruntime(10424): caused by: java.lang.classcastexception: android.webkit.webview cannot cast android.widget.button 05-09 13:25:19.756: e/androidruntime(10424):    @ com.example.dcc.actionitem.oncreate(actionitem.java:54) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.activity.performcreate(activity.java:5008) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.instrumentation.callactivityoncreate(instrumentation.java:1079) 05-09 13:25:19.756: e/androidruntime(10424):    @ android.app.activitythread.performlaunchactivity(activitythread.java:2023) 05-09 13:25:19.756: e/androidruntime(10424):    ... 11 more    <gridlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:columncount="4" > <linearlayout     android:layout_width="212dp"     android:layout_height="match_parent"     android:layout_column="0"     android:layout_columnspan="3"     android:layout_gravity="left"     android:layout_row="0"     android:orientation="vertical" >      <button         android:id="@+id/button1"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button1_name"         android:drawableright="@drawable/news"/>     <button         android:id="@+id/button2"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button2_name" />     <button         android:id="@+id/button3"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button3_name"         android:drawableright="@drawable/cal"/>     <button         android:id="@+id/button4"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button4_name"         android:drawableright="@drawable/mail"/>     <button         android:id="@+id/button5"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button5_name"         android:drawableright="@drawable/gallery" />     <button         android:id="@+id/button6"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button6_name"         android:drawableright="@drawable/report" />     <button         android:id="@+id/button7"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button7_name"         android:drawableright="@drawable/ep" />     <button         android:id="@+id/button8"         android:layout_width="match_parent"         android:layout_height="wrap_content"         android:text="@string/button8_name"         android:drawableright="@drawable/directory" /> </linearlayout> <gridlayout android:id="@+id/a" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_column="1" android:layout_columnspan="2" android:layout_gravity="left" android:layout_row="0" android:columncount="2" > </gridlayout> <imageview android:id="@+id/imageview1" android:layout_width="10dp" android:layout_height="fill_parent" android:layout_column="2" android:layout_gravity="left" android:layout_row="0" android:background="@drawable/black" tools:ignore="contentdescription" />  　    <scrollview     android:id="@+id/scrollview1"     android:layout_width="238dp"     android:layout_height="fill_parent"     android:layout_column="3"     android:layout_gravity="left|top"     android:layout_row="0"     android:background="@android:color/black" >      <linearlayout         android:layout_width="fill_parent"         android:layout_height="match_parent"         android:orientation="vertical" >          <textview             android:id="@+id/feedtitle"             android:layout_width="fill_parent"             android:layout_height="wrap_content" />          <textview             android:id="@+id/feeddescribtion"             android:layout_width="fill_parent"             android:layout_height="wrap_content" />          <textview             android:id="@+id/feedpubdate"             android:layout_width="fill_parent"             android:layout_height="wrap_content" />          <textview             android:id="@+id/feedlink"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:autolink="web" />          <listview             android:id="@android:id/list"             android:layout_width="fill_parent"             android:layout_height="594dp" >         </listview>          <textview             android:id="@android:id/empty"             android:layout_width="fill_parent"             android:layout_height="wrap_content"             android:text="waiting" />     </linearlayout> </scrollview>  <webview     android:id="@+id/webview1"     android:layout_width="830dp"     android:layout_height="555dp"     android:layout_column="3"     android:layout_gravity="right|bottom"     android:layout_row="0" />  <button     android:id="@+id/email_button1"     android:layout_width="585dp"     android:layout_height="114dp"     android:layout_column="3"     android:layout_gravity="center_horizontal|top"     android:layout_row="0"     android:text="submit action item now" />  <textview     android:id="@+id/actionview"     android:layout_width="243dp"     android:layout_height="113dp"     android:layout_column="3"     android:layout_gravity="right|top"     android:layout_row="0"     android:text="loading" />   </gridlayout>      package com.example.dcc;  import java.io.ioexception; import java.net.malformedurlexception; import java.net.url;  import javax.xml.parsers.parserconfigurationexception; import javax.xml.parsers.saxparser; import javax.xml.parsers.saxparserfactory;  import org.xml.sax.inputsource; import org.xml.sax.saxexception; import org.xml.sax.xmlreader;  import android.app.listactivity; import android.content.intent; import android.net.uri; import android.os.asynctask; import android.os.bundle; import android.view.view; import android.view.view.onclicklistener; import android.webkit.websettings; import android.webkit.webview; import android.webkit.webviewclient; import android.widget.arrayadapter; import android.widget.button; import android.widget.listview; import android.widget.textview;  public class actionitem extends listactivity implements onclicklistener {     // create buttons globally available methods     public static rssfeed myrssfeed = null;     private button btnemail = null;     static webview webview;     button newsb;     button loginb;     button calb;     button mailb;     button photob;     button reportb;     button actionb;     button directoryb;      string currentitem;     textview thisaction;     int currentlocation;      /** called when activity first created. */     @override     public void oncreate(bundle savedinstancestate) {         super.oncreate(savedinstancestate);         setcontentview(r.layout.action_item);          btnemail = (button) findviewbyid(r.id.email_button1);         newsb = (button) findviewbyid(r.id.button1);         loginb = (button) findviewbyid(r.id.button2);         calb = (button) findviewbyid(r.id.button3);         mailb = (button) findviewbyid(r.id.button4);         photob = (button) findviewbyid(r.id.button5);         reportb = (button) findviewbyid(r.id.button6);         actionb = (button) findviewbyid(r.id.button7);         directoryb = (button) findviewbyid(r.id.button8);         thisaction = (textview) findviewbyid(r.id.actionview);          newsb.setonclicklistener(this);         loginb.setonclicklistener(this);         calb.setonclicklistener(this);         mailb.setonclicklistener(this);         photob.setonclicklistener(this);         reportb.setonclicklistener(this);         actionb.setonclicklistener(this);         directoryb.setonclicklistener(this);         btnemail.setonclicklistener(this);          new mytask().execute();          // portion of oncreate dedicated running webview         // webpage: http://creflodollarministries.org/         // main webpage: http://www.virtualdiscoverycenter.net         webview = (webview) findviewbyid(r.id.webview1);         webview.setwebviewclient(new webviewclient());         webview.loadurl("http://www.virtualdiscoverycenter.net");         websettings websettings = webview.getsettings();         websettings.setjavascriptenabled(true);          uri data = getintent().getdata();          if (savedinstancestate == null) {             string url = getintent().getdatastring();             // url.             webview.loadurl(url);         }      }      private class mytask extends asynctask<void, void, void> {          @override         protected void doinbackground(void... arg0) {             try {                 url rssurl = new url(                         "http://www.virtualdiscoverycenter.net/feed/");// http://www.virtualdiscoverycenter.net/feed/                 saxparserfactory mysaxparserfactory = saxparserfactory                         .newinstance();                 saxparser mysaxparser = mysaxparserfactory.newsaxparser();                 xmlreader myxmlreader = mysaxparser.getxmlreader();                 rsshandler myrsshandler = new rsshandler();                 myxmlreader.setcontenthandler(myrsshandler);                 inputsource myinputsource = new inputsource(rssurl.openstream());                 myxmlreader.parse(myinputsource);                  myrssfeed = myrsshandler.getfeed();             } catch (malformedurlexception e) {                 e.printstacktrace();             } catch (parserconfigurationexception e) {                 e.printstacktrace();             } catch (saxexception e) {                 e.printstacktrace();             } catch (ioexception e) {                 e.printstacktrace();             }              return null;         }          @override         protected void onpostexecute(void result) {             if (myrssfeed != null) {                 textview feedtitle = (textview) findviewbyid(r.id.feedtitle);                 textview feeddescribtion = (textview) findviewbyid(r.id.feeddescribtion);                 textview feedpubdate = (textview) findviewbyid(r.id.feedpubdate);                 textview feedlink = (textview) findviewbyid(r.id.feedlink);                 feedtitle.settext(myrssfeed.gettitle());                 feeddescribtion.settext(myrssfeed.getdescription());                 feedpubdate.settext(myrssfeed.getpubdate());                 feedlink.settext(myrssfeed.getlink());                  arrayadapter<rssitem> adapter = new arrayadapter<rssitem>(                         getapplicationcontext(),                         android.r.layout.simple_list_item_1,                         myrssfeed.getlist());                 setlistadapter(adapter);                  thisaction.settext(myrssfeed.getitem(0).gettitle());              } else {                  textview textempty = (textview) findviewbyid(android.r.id.empty);                 textempty.settext("no feed found!");             }              super.onpostexecute(result);         }      }      @override     protected void onlistitemclick(listview l, view v, int position, long id) {          // uri feeduri = uri.parse(myrssfeed.getitem(position).getlink());         // intent myintent = new intent(intent.action_view, feeduri);         // startactivity(myintent);         string url = myrssfeed.getitem(position).getlink();         currentitem = myrssfeed.getitem(position).gettitle();         currentlocation = position;         thisaction.settext(currentitem);         webview.loadurl(url);     }      public void sendemail(view v) {         // following code implementation of email client         intent = new intent(android.content.intent.action_send);         i.settype("text/plain");         string[] address = { "bevins2012@hotmail.com" };          i.putextra(android.content.intent.extra_email, address);         i.putextra(android.content.intent.extra_subject, myrssfeed.getitem(currentlocation).getdescription());         i.putextra(android.content.intent.extra_text,                 "action item dcc app.");         startactivityforresult((intent.createchooser(i, "email")), 1);     }      public void onclick(view v) {         // switch listens , click actions in app         // each case button in menu.         switch (v.getid()) {         case r.id.button1:             startactivity(new intent(this, androidrssreader.class));             break;         case r.id.button2:             startactivity(new intent(this, mainactivity.class));             break;         case r.id.button3:             startactivity(new intent(this, mainactivity.class));             break;         case r.id.button4:             startactivity(new intent(this, emailmain.class));             break;         case r.id.button5:             startactivity(new intent(this, customizedlistview.class));             break;         case r.id.button6:             startactivity(new intent(this, launchactivity.class));             break;         case r.id.button7:             startactivity(new intent(this, actionitem.class));             break;         case r.id.button8:             startactivity(new intent(this, mainactivity.class));             finish();             break;         case r.id.email_button1:             // calling sendemail activity class             sendemail(v);             break;         }     } } 

perhaps auto-generated r class messed up. try clean , rebuild project using project > clean... in eclipse.