Already asked a similar question, yet without much luck.
Suppose I have a service and I need a view to pop up above it. In the same time, they both should be intract
Services run in the background and do not have an UI. So you can not show something over a Service.
If you need a Service to notify user about something, then use Notification.
Ayou could use a Toast, but I advise against it, as it can confuse users since it can pop-out over another app's activity.
Toast