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# DeviceActivityData.ActivitySegment

Activity data for a specific time interval.

```
struct ActivitySegment
```

## Overview

This type contains all of the activity details for a particular person on a particular device during [`dateInterval`](/documentation/DeviceActivity/DeviceActivityData/ActivitySegment/dateInterval).

## Topics

### Defining the segment

[`var dateInterval: DateInterval`](/documentation/DeviceActivity/DeviceActivityData/ActivitySegment/dateInterval)

Access the date interval of the activity segment.

### Measuring activity

[`var totalActivityDuration: TimeInterval`](/documentation/DeviceActivity/DeviceActivityData/ActivitySegment/totalActivityDuration)

Access the total activity time during the activity segment.

[`var longestActivity: DateInterval?`](/documentation/DeviceActivity/DeviceActivityData/ActivitySegment/longestActivity)

Access the date interval of the longest activity session during the activity segment.

### Tracking device usage

[`var firstPickup: Date?`](/documentation/DeviceActivity/DeviceActivityData/ActivitySegment/firstPickup)

Access the first time the person picked up the device during the activity segment.

[`var totalPickupsWithoutApplicationActivity: Int`](/documentation/DeviceActivity/DeviceActivityData/ActivitySegment/totalPickupsWithoutApplicationActivity)

Access the number of device pickups without application use.

### Accessing categorized activity

[`var categories: DeviceActivityResults<DeviceActivityData.CategoryActivity>`](/documentation/DeviceActivity/DeviceActivityData/ActivitySegment/categories)

Access the categorized device activity during the activity segment.

## Relationships

### Conforms To

[`Equatable`](/documentation/Swift/Equatable)

[`Hashable`](/documentation/Swift/Hashable)

---

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