Event Listener android lock screen state

Android lock screen monitor

I would like to state the phone lock screen can still press the volume keys to make listening, how to achieve?

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No expert pointing out about it?
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Personally think that if someone else's lock screen application with this really can not listen hope under the guidance of experienced people
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For example, after a cool dog music lock screen can monitor volume keys because he was directly own lock screen application can go and see
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apk permissions have this: Hardware controls change your audio settings cool dog should be the volume control