Android Question Arduino Android bluetooth communication


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I've recently started to program an arduino - android project that relies on the arduino sending a steady stream of data to the android device by bluetooth connection. None of the tutorials seem to really be getting me further- can someone please explain how I could explicitly send information from the arduino and recieve it at the android device? How much code will I need? What does each part of the code do?

Thank you so very much for any help you may be able to offer me!