How can i get the tweets of a particular person in api 1.1?


I am using twitter4j lib and i want to get the tweets of a particular screen name which i enter in the edit text… I am able to authorize but the problem is i want to parse the json to get the tweets and the name, time etc which twitter4j lib is not providing me, Previously i just used to append the username to the api (1.0) and the tweets were back in json form now how can i send the access token which i get to the new api (1.1) so that i get the json in android??/