只有通过 Obscured 事件通知您才能对来电进行任何处理.
请注意，其他事情(例如警报)也会触发此事件，您的应用内无法知道是什么原因导致您的应用被遮挡.

The only way you can do anything in relation to an incoming call is be informed that this has happened via the Obscured event.
Be aware that other things (such as an alarm) also trigger this event and there is no way within your app to know what caused your app to be obscured.