Shouldoverrideurlloading méthode dans android

Je suis en cours d'exécution des ennuis dans shouldoverrideurlloading méthode, dans laquelle l'URL de remplacement n'est pas montré. Au lieu de cela, un écran blanc vide est à venir, et Logcat n'indique aucune erreur. J'ai le code fourni ci-dessous . Où suis-je fait une erreur? Veuillez informer

package com.example.webviewkm;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.app.Dialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.Menu;
import android.view.View;
import android.webkit.HttpAuthHandler;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.net.http.SslError;
import android.webkit.SslErrorHandler;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
WebView webView = (WebView) findViewById(R.id.MyWebView);
webView.setInitialScale(67);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webView.setVerticalScrollBarEnabled(false);
webView.setHorizontalScrollBarEnabled(false);
webView.setWebViewClient(new WebViewClient() {
@Override 
public void onReceivedLoginRequest(WebView view, String realm, 
String account, String args) { 
System.err.println(realm); 
System.err.println(account); 
System.out.println(args); }
@Override
public void onReceivedError( WebView view, int errorCode, String description, String failingUrl ) {
Toast.makeText(view.getContext(), "Unknown Error", Toast.LENGTH_LONG).show();
System.err.println(errorCode + " - " + description + "-" + failingUrl); 
}
@Override
public void onReceivedSslError( WebView view, SslErrorHandler handler, SslError error ) {
System.err.println("SSL ERROR");  
handler.proceed();
}
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
Intent intent = new Intent(MainActivity.this, MainActivity.class);
intent.putExtra("url", url);
startActivity(intent);
return true;
}
@Override
public void onReceivedHttpAuthRequest(WebView view, final HttpAuthHandler handler, final String host,
String realm) {
System.err.println("HTTP auth request"); 
final SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(MainActivity.this);        
if (handler.useHttpAuthUsernamePassword()) {
if (preferences.contains("username")) {
handler.proceed(preferences.getString("username", null), preferences.getString("password", null));
return;
}
}
new Dialog(MainActivity.this){
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle(host);
setContentView(R.layout.credentials);
final EditText userName = (EditText) findViewById(R.id.UserName);
final EditText password = (EditText) findViewById(R.id.Password);
userName.setText(preferences.getString("username", ""));
password.setText(preferences.getString("password", ""));
Button button = (Button) findViewById(R.id.GoButton);
button.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) {
String userName2 = userName.getText().toString();
String password2 = password.getText().toString();
Editor edit = preferences.edit();
edit.putString("username", userName2);
edit.putString("password", password2);
edit.commit();
handler.proceed(userName2, password2);
dismiss();
}});
}
}.show();
}
});
String url;
if (getIntent().hasExtra("url")) {
url = getIntent().getStringExtra("url");
} else {
url = "https://kee.mahindrasatyam.com/_layouts/mobile/mobilesearch.aspx";
}
webView.loadUrl(url);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
Intent intent = new Intent(MainActivity.this, MainActivity.class);
startActivity(intent);
return true;
}
}