Android WebView Back Button:

      To handle the BACK button key press, add the following method inside the WebViewActivity Activity:

public class WebViewActivity extends Activity {
    /** Called when the activity is first created. */ 
 
 WebView web;
  
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        web = (WebView) findViewById(R.id.webview01);
        web.setWebViewClient(new myWebClient());
        web.getSettings().setJavaScriptEnabled(true);
        web.loadUrl("http://www.google.co.uk");
    }
    
    public class myWebClient extends WebViewClient
    {
     @Override
     public void onPageStarted(WebView view, String url, Bitmap favicon) {
      // TODO Auto-generated method stub
      super.onPageStarted(view, url, favicon);
     }
     
     @Override
     public boolean shouldOverrideUrlLoading(WebView view, String url) {
      // TODO Auto-generated method stub
      
      view.loadUrl(url);
      return true;
      
     }
    }
    
    // To handle "Back" key press event for WebView to go back to previous screen.
 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) 
 {
  if ((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack()) {
   web.goBack();
   return true;
  }
  return super.onKeyDown(keyCode, event);
 }
}