I wanted to use deviceActivity target (File->New->Target). A package was created with filename "TotalActivityView". But i am getting this error while trying to preview it. ERROR: Cannot preview in this file ".appex is an unsupported extension" How do I use the deviceActivity target in my project?

I need to get the time of phone pickup and time of usage after the pickup and drop. DeviceActivityData.ActivitySegment -> a struct contains all these information. Where and how can i access these information?    let v = DeviceActivityData.ActivitySegment().totalActivityDuration ERROR: 'DeviceActivityData.ActivitySegment' cannot be constructed because it has no accessible initializers How do I initialise DeviceActivityData?

Is it possible to run the app in the background even though the user has completely closed it? I want to fetch device activity every 15 mins. Is this possible to fetch even though the app is completely closed?