Android中使用WebView, WebChromeClient和WebViewClient加载网页

<?xml version="1.0" encoding="utf-8"?> 

<WebView xmlns:android="http://schemas.android.com/apk/res/android" 

 android:id="@+id/webView" android:layout_width="fill_parent" 

 android:layout_height="fill_parent" />

public class WebPageLoader extends Activity
  {    
    final Activity activity = this;   
    @Override   
    public void onCreate(Bundle savedInstanceState)   
    {    
      super.onCreate(savedInstanceState);    
      this.getWindow().requestFeature(Window.FEATURE_PROGRESS);   
      setContentView(R.layout.main);  
      WebView webView = (WebView) findViewById(R.id.webView);   
      webView.getSettings().setJavaScriptEnabled(true);
    webView.getSettings().setSupportZoom(true);
      webView.setWebChromeClient(new WebChromeClient() 
      {          
        public void onProgressChanged(WebView view, int progress)   
        {            
          activity.setTitle("Loading...");       
          activity.setProgress(progress * 100);     
          if(progress == 100)            
            activity.setTitle(R.string.app_name);       
          }      
        }
      );      
      webView.setWebViewClient(new WebViewClient() {   
               
        public void onReceivedError(WebView view, int errorCode, String description, String failingUrl)   
        {                 // Handle the error       
          
        }             
              
        public boolean shouldOverrideUrlLoading(WebView view, String url) 
        {              
          view.loadUrl(url);   
          return true;       
          }      
        });  
      webView.loadUrl("http://www.sohu.com");  
      } 
    }