ActivityRecognizer QML Type

Uses activity and motion recognition to determine if the user is stationary, walking, running, or in a vehicle. More...

• List of all members, including inherited members

Properties

• error : ActivityRecognizerError
• results : ActivityRecognizerResultsModel
• state : ActivityRecognizerState
• supported : bool
• updateInterval : int

Methods

• start()
• stop()

Detailed Description

The ActivityRecognition component uses device and motion sensors to detect the user's current activities. The following activities can be recognised: stationary, walking, running, biking, automotive, tilting, and unknown.

Activity recognition is only available on Android and iOS devices.

On its own, the ActivityRecognition component will only report activity updates while the app is in foreground. For an app to receive activity updates while in the background, you must include a PositionSource component in the app, and enable both location and background location in the Capabilities section of your app's Settings.

The following code snippet shows the activity recognition being refreshed every 3 seconds.

ActivityRecognizer {
    id: activityRecognizer
    updateInterval: 3000
    onResultsChanged: {
        for (let i=1; i<results.count(); i++) {
            let res = results.get(i)
            console.log("Type " + getActivityName(res.activity))
            console.log("Confidence " + getConfidenceValue(res.confidence))
            console.log("Score " + res.confidenceScore)
        }
    }
    onStateChanged: {
        console.log("Activity recognition " + getStateName(state))
    }
    onErrorChanged: {
        console.log(error.errorMessage)
    }
    function getActivityName(type) {
        switch(type) {
        case 0:
            return "Unknown"
        case 1:
            return "Stationary"
        case 2:
            return "Walking"
        case 3:
            return "Running"
        case 4:
            return "Biking"
        case 5:
            return "Automotive"
        case 6:
            return "Tilting"
        default:
            return "Unknown"
        }
    }
    function getConfidenceValue(confidence) {
        switch(confidence) {
        case 0:
            return "Low"
        case 1:
            return "Medium"
        case 2:
            return "High"
        }
    }
    function getStateName(state) {
        switch(state) {
        case 0:
            return "started"
        case 1:
            return "stopped"
        default:
            return "state unknown"
        }
    }
}

Enumerations

ActivityRecognizerState enumeration

Property Documentation

Method Documentation