An app which sets all calls in silent mode except those selected contacts?

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http://androidforums.com – Hi all :) I am a 3rd year Engineering student. I have got a project on Android application- silent features in my college. We have to develop an android app which will put the phone in silent mode for all incoming calls, expect for those the user selects (for these selected contacts the phone should ring). Is there any online tutorials available for android where i can start learning android programming ? As i don't have much time left to join any classes for the same. This project has to be submitted within 3 weeks. I need help regarding my project :confused: Can anybody help me w (General)