I got solution for this, I used yahoo mobile login URL for login and I set the yahoo api URL in "done" parameter. It redirect to yahoo api for app authorization.
var authPageURL = "https://api.login.yahoo.com/oauth/v2/request_auth?oauth_token=" + oauthToken;
var yahooMobileLoginUrl = "https://login.yahoo.com/m?&.src=oauth&.lang=en-us&.intl=us&.done=" + authPageURL;
YahooWebView.setUrl(yahooMobileLoginUrl);