This application make mute the music volume, when you unplug a headset(earphone/bluetooth A2DP device) from a phone.
it unmute the music volume automatically when you plug a headset.
Note for Android 6.0 or later.
Mute API was deprecated since Android 6.0.
This app fix volume to zero instead of Mute API.
Android 6.0: Xperia Z3+(Z4)