webview中的对话框

Question

我想在从一个页面切换到另一个页面时显示警告消息。通过单击按钮，它应该加载目标页面。这是我的代码。我正在使用android studio 2.3.3。它不起作用。你能建议任何修改吗？谢谢你...

@SuppressWarnings("deprecation")
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {

 if(url.equals(Common_variables.BASE_URL + "s.changePswd.php")) {

    AlertDialog.Builder b = new AlertDialog.Builder(Send_OTP.this);
    b.setMessage("OTP has sent to your mail id");
    b.setCancelable(true);
    b.setPositiveButton("Ok", new DialogInterface.OnClickListener() 
     {
      @Override
       public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
Intent regIntent = new Intent(Send_OTP.this,Forgot_password.class);
                    startActivity(regIntent);
     }
   });

  AlertDialog alert = b.create();
  alert.show();
  }
   else
      sendOTPwv.loadUrl(url);

 return true;

  }

 @TargetApi(Build.VERSION_CODES.N)
 @Override
 public boolean shouldOverrideUrlLoading(WebView view, WebResourceRequest 
       request)
  {
 if(request.getUrl().toString().equals(Common_variables.BASE_URL + 
                "s.changePswd.php"))
  {
     AlertDialog.Builder b = new AlertDialog.Builder(Send_OTP.this);
     b.setMessage("OTP has sent to your mail id");
     b.setCancelable(true);
     b.setPositiveButton("Ok", new DialogInterface.OnClickListener() 
     {
       @Override
       public void onClick(DialogInterface dialog, int which) {
       dialog.cancel();
 Intent regIntent = new Intent(Send_OTP.this,Forgot_password.class);
    startActivity(regIntent);
  }
 });

    AlertDialog alert = b.create();
    alert.show();

   }

   else
     sendOTPwv.loadUrl(request.getUrl().toString());
     return true;
     }
     }
  }

请建议我必须在代码中进行更改。