Trying to title of film about poor black boy who shines shoes to earn money to feed his family but it only feeds his mothers drug habit, a man who owns a restaurant lets him shine shoes in the restaurant for a while but catches him stealing (food I think, can't quite remember) and tells him to leave. He ends up taking the boy back when he finds out about the boys home life and eventually tries to adopt the boy.

The movie that you are seeking is called "On the Right Track". Here's a link to it on imdb.com:

On the Right Track (1981) (http://www.imdb.com/title/tt0082849/)