reception of radio waves with an android phone

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Good evening everybody, I would like to develop an application under android, which can receive frequencies from a radio stations. My idea is to scan the radio frequencies between two values. ie, "scan" between a minimum frequency and maximum frequency. eg: a button starts the scan from (87.5 MHz - 108 MHz) => (87.5 MHz <= f = <108 MHz). But so far I do not know where to start! I have lots of questions in my head. - How do we know that such an android terminal has a radio receiver? Ie is there a function or activity system can help us to detect its presence? - What I need for this type of development?

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There is no FM Radio API in android. Any FM Radios on phones are firmware unique to each phone.