Intent used to broadcast the change in the Audio Connection state of the A2DP profile.
This intent will have 3 extras:
BluetoothProfile.ExtraState or BluetoothProfile.ExtraPreviousState can be any of BluetoothHeadset.StateAudioConnected, BluetoothHeadset.StateAudioDisconnected,
Requires NoType:android/Manifest$permission;Href=../../../reference/android/Manifest.permission.html#BLUETOOTH permission to receive.