how to know that user accept oauth permission in youtube api v2 in android -

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i want use youtube api v2 in android, following developers.google.com/youtube when open https://accounts.google.com/o/oauth2/auth?client_id=client_id&redirect_uri=redirect_uri&scope=https://gdata.youtube.com&response_type=code url in webview, ask access application. how know if user accept it, because after accepting webview redirect page can success code=4/fsgko348949

i think tutorial can useful:

http://blog.blundell-apps.com/tut-oauth-youtube-api-access/

this tutorial shows how detect if user selects “allow access” using listener:

package com.blundell.youtubesignin.oauth;  /**  * class checks paramater's our redirect url has informing our listener  * passes auth code if access granted.  *  * google documentation:  * if user granted access application,  * google have appended code parameter redirect_uri.  * value temporary authorization code can exchange access token.  * example : http://localhost/oauth2callback?code=4/ux5gnj-_miu4dod_gnzdjx9etoff  *  * if user refused grant access application,  * google have included access_denied error message in hash fragment of redirect_uri.  * example : http://localhost/oauth2callback#error=access_denied  *  * @author paul.blundell  *  */ public class paramchecker implements onoauthcallbacklistener {      private final onoauthlistener onoauth;      public paramchecker(onoauthlistener onoauth) {         this.onoauth = onoauth;     }      @override     public void onoauthcallback(string params) {         if(params.contains("access_denied")){             // user said no             onoauth.onrefused();         } else {             // user auth'd             string authcode = extractauthcode(params);             onoauth.onauthorized(authcode);         }     }      private static string extractauthcode(string params) {         return params.substring(constants.auth_code_param.length()+1);     }  }

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