[android] earphone(headset) plug or unplug intent action

[android] earphone(headset) plug or unplug intent action

https://developer.android.com/reference/android/media/AudioManager.html#ACTION_HEADSET_PLUG

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Action 은 AudioMangaer.ACTION_HEADSET_PLUG.

intent extra 로 아래 값들이 있다.

"state"

0 : unplugged

1 : plugged

"name"

headset type, human readable string

"microphone"

0 : microphone 기능이 없음

1 : microphone 기능이 함께 있음

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manifest 를 통해서 receiver 등록되지 않는다.

앱에서 명시적으로 등록해야 한다.

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