你好，
这个需求是可以实现的，我们需要使用AudioRoutingManager 这个类，处理AudioEndPointChanged 事件：
http://msdn.microsoft.com/en-us/library/windows.phone.media.devices.audioroutingmanager.audioendpointchanged.aspx
It occurs when the audio endpoint currently in use has changed, or when the set of available audio endpoints has changed.
使用AudioRoutingManager.GetAudioEndpoint()方法获取当前的AudioRoutingEndpoint
类型，从而识别是否有耳机插入
#AudioRoutingEndpoint enumeration
http://msdn.microsoft.com/en-us/library/windows.phone.media.devices.audioroutingendpoint.aspx
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