How do I control the onCompletion() method in the service class

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http://stackoverflow.com – I have a Service n UI class the Service class has the mediaplayer n onCompletion methods to see keep track of a completed song. Well the problem is how do I notify the UI about the completion of the song from the Service class so that it changes its details according to the new song that is now going to be played?. (HowTos)