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Proximity sensor

doc/articles/features/proximity-sensor.md

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Proximity sensor

[!TIP] This article covers Uno-specific information for ProximitySensor. For a full description of the feature and instructions on using it, see ProximitySensor Class.

  • The Windows.Devices.Sensors.ProximitySensor class allows measuring distance of an object in millimeters.

Using ProximitySensor with Uno

  • The sensor is currently only available on Android.
  • To retrieve the available sensors, DeviceInformation.FindAllAsync method is used.

Example

Capturing sensor readings

csharp
var selector = ProximitySensor.GetDeviceSelector();
var devices = await DeviceInformation.FindAllAsync(selector);
var device = devices.FirstOrDefault();
if (device is not null)
{
    var proximitySensor = ProximitySensor.FromId(device.Id);
    proximitySensor.ReadingChanged += ProximitySensor_ReadingChanged;
}

// ..

private async void ProximitySensor_ReadingChanged(ProximitySensor sender, ProximitySensorReadingChangedEventArgs args)
{
    await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
    {
        uint? distanceInMillimeters = args.Reading.DistanceInMillimeters;
        bool isDetected = args.Reading.IsDetected;
    });
}

Unsubscribing from the readings

csharp
proximitySensor.ReadingChanged -= ProximitySensor_ReadingChanged;