java - Android, proxy and Authentication -

as part of development of android application business, have communicate through proxy authentication server.

here's code wrote:

final httpurlconnection connection = (httpurlconnection) new                         url(url).openconnection(new proxy(proxy.type.http, new             inetsocketaddress(proxy_name, proxy_port)));  authenticator.setdefault(new ntlmauthenticator(proxy_username, proxy_password));  connection.setconnecttimeout(5000); connection.setrequestproperty("content-type", "text/xml; charset=utf-8"); connection.setdoinput(true); connection.setdooutput(true);  final int retcode = connection.getresponsecode();  system.out.println("return code : " + retcode); 

with class

private class ntlmauthenticator extends authenticator {     private final string username;     private final string password;      public ntlmauthenticator(final string username, final string password) {         super();         this.username = username;         this.password = password;     }      @override     public passwordauthentication getpasswordauthentication() {         system.out.println("get password auth");         return (new passwordauthentication(username, password.tochararray()));     } } 

unfortunately, still response code equal 407 , i've realized never spent in method getpasswordauthentication

the same program works java program not android.

my version of android 4.4.4 , have seen used okhttp queries. debugging , entering code of android, i've realized object contained okhttp proxy configuration not authenticator.

could me ?

thank you