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POandroid.webkit.WebView cannot be cast to android.widget.Button
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  1. POandroid.webkit.WebView cannot be cast to android.widget.Button
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    copied!<p>I was working on a GUI inside of my app. I originally had a crappy look to it that just contained all of the basic stuff to test my java functions in. After I had all the functions up and running I redisgned the GUI using the graphical editor in Eclipse. The next time I ran my app I had the android.webkit.WebView cannot be cast to android.widget.Button in my LogCat. I didn't change anything in the java and all the declarations in the GUI are the same as far as I can tell. I can easily revert the GUI back to the crappy version but that doesn't help me much. I hope someone on here can help me find my problem. I have posted the xml, java, and LogCat.</p> <pre><code>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 to start activity ComponentInfo{com.example.dcc/com.example.dcc.ActionItem}: java.lang.ClassCastException: android.webkit.WebView cannot be cast to android.widget.Button 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2059) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.ActivityThread.access$600(ActivityThread.java:130) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.os.Handler.dispatchMessage(Handler.java:99) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.os.Looper.loop(Looper.java:137) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.ActivityThread.main(ActivityThread.java:4745) 05-09 13:25:19.756: E/AndroidRuntime(10424): at java.lang.reflect.Method.invokeNative(Native Method) 05-09 13:25:19.756: E/AndroidRuntime(10424): at java.lang.reflect.Method.invoke(Method.java:511) 05-09 13:25:19.756: E/AndroidRuntime(10424): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 05-09 13:25:19.756: E/AndroidRuntime(10424): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 05-09 13:25:19.756: E/AndroidRuntime(10424): at dalvik.system.NativeStart.main(Native Method) 05-09 13:25:19.756: E/AndroidRuntime(10424): Caused by: java.lang.ClassCastException: android.webkit.WebView cannot be cast to android.widget.Button 05-09 13:25:19.756: E/AndroidRuntime(10424): at com.example.dcc.ActionItem.onCreate(ActionItem.java:54) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.Activity.performCreate(Activity.java:5008) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) 05-09 13:25:19.756: E/AndroidRuntime(10424): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) 05-09 13:25:19.756: E/AndroidRuntime(10424): ... 11 more &lt;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" &gt; &lt;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" &gt; &lt;Button android:id="@+id/button1" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button1_name" android:drawableRight="@drawable/news"/&gt; &lt;Button android:id="@+id/button2" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button2_name" /&gt; &lt;Button android:id="@+id/button3" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button3_name" android:drawableRight="@drawable/cal"/&gt; &lt;Button android:id="@+id/button4" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button4_name" android:drawableRight="@drawable/mail"/&gt; &lt;Button android:id="@+id/button5" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button5_name" android:drawableRight="@drawable/gallery" /&gt; &lt;Button android:id="@+id/button6" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button6_name" android:drawableRight="@drawable/report" /&gt; &lt;Button android:id="@+id/button7" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button7_name" android:drawableRight="@drawable/ep" /&gt; &lt;Button android:id="@+id/button8" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="@string/Button8_name" android:drawableRight="@drawable/directory" /&gt; &lt;/LinearLayout&gt; &lt;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" &gt; &lt;/GridLayout&gt; &lt;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" /&gt; 　 &lt;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" &gt; &lt;LinearLayout android:layout_width="fill_parent" android:layout_height="match_parent" android:orientation="vertical" &gt; &lt;TextView android:id="@+id/feedtitle" android:layout_width="fill_parent" android:layout_height="wrap_content" /&gt; &lt;TextView android:id="@+id/feeddescribtion" android:layout_width="fill_parent" android:layout_height="wrap_content" /&gt; &lt;TextView android:id="@+id/feedpubdate" android:layout_width="fill_parent" android:layout_height="wrap_content" /&gt; &lt;TextView android:id="@+id/feedlink" android:layout_width="fill_parent" android:layout_height="wrap_content" android:autoLink="web" /&gt; &lt;ListView android:id="@android:id/list" android:layout_width="fill_parent" android:layout_height="594dp" &gt; &lt;/ListView&gt; &lt;TextView android:id="@android:id/empty" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="waiting" /&gt; &lt;/LinearLayout&gt; &lt;/ScrollView&gt; &lt;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" /&gt; &lt;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" /&gt; &lt;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" /&gt; &lt;/GridLayout&gt; 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 so they are available to all 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 the activity is 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(); // this portion of the onCreate is dedicated to running the webView // another 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(); // do something with this URL. webView.loadUrl(url); } } private class MyTask extends AsyncTask&lt;Void, Void, Void&gt; { @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&lt;RSSItem&gt; adapter = new ArrayAdapter&lt;RSSItem&gt;( 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) { // The following code is the implementation of Email client Intent i = 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 from DCC app."); startActivityForResult((Intent.createChooser(i, "Email")), 1); } public void onClick(View v) { // this switch listens for any and all click actions in the app // each case is a button in the 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 from the activity class sendEmail(v); break; } } } </code></pre>
 

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