Problem reinitialize Twitter

[sindycarlo]

Hi,
in my app set TwitterConfig with consumer_key and consumer_secret in this way:

    TwitterConfig twitterConfig = new TwitterConfig
            .Builder(this.activity)
            .logger(new DefaultLogger(Log.DEBUG))
            .twitterAuthConfig(new TwitterAuthConfig(CONSUMER_KEY, CONSUMER_SECRET))
            .debug(true)
            .build();
    Twitter.initialize(twitterConfig);

how can reinitialize TwitterConfig (with new tokens) when i restart the activity?. Because if i restart application TwitterSession not change. (i test app passing tokens not valid).