What part of the Android software stack handles commands through the headphone jack? (e.g. answering calls w/ a headset)
Where does Android deal with commands sent through headsets connected through a headphone jack? Specifically, for play/pause and answering calls? Is this buried in the OS or can it be accessed through an API?
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this isn’t really related to any of the android features or capabilities, it’s just hardware related, a 3.5 doesn’t have a limited and clearly defined number of connection, you can have a jack that is mono, stereo, with 3 channels or even other configurations.
as far as I know this kind of hardware ( the jack slot ) it’s not even named in the list of requirements for getting the Google’s commercial version of Android, so you can’t even picture a clear set of devices based on the android version that you are targeting.