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# HKActivitySummaryQuery

A query for reading activity summary objects from the HealthKit store.

```
class HKActivitySummaryQuery
```

## Overview

Activity summary query objects are mostly immutable. You can assign the query’s [`updateHandler`](/documentation/HealthKit/HKActivitySummaryQuery/updateHandler) property after instantiating the object, but before executing the query. All other properties must be set when you instantiate the object, and they can’t change.

## Topics

### Creating activity summary queries

  <doc://com.apple.healthkit/documentation/HealthKit/executing-activity-summary-queries>

[`init(predicate:resultsHandler:)`](/documentation/HealthKit/HKActivitySummaryQuery/init(predicate:resultsHandler:))

Initializes a new active summary query.

### Getting property data

[`updateHandler`](/documentation/HealthKit/HKActivitySummaryQuery/updateHandler)

The handler for monitoring updates to activity summaries saved in the HealthKit store.


---

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