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I want to know the FM Radio signal strength in Android. For this I have to interact with hardware or not? Or is there any API which can directly give me the value of signal strength?
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FM radio is available in some phones. Anyways you must have an FM tuner (radio) built-in.
Yes, of course you will have to as it has not been brought into the stack.
I think, NO.
Maybe you will have to write your own jni, and java source and add it to the stack, if you need one.