[Android][iOS] Geolocator.PositionChanged doesn't trigger

[mcocaroUX]

Current behavior

Event PositionChanged never gets triggered when subscribed (tested on emulators and physical devices)

Expected behavior

PositionChanged should trigger when user moves

How to reproduce it (as minimally and precisely as possible)

GeoTest.zip

Geolocator.Position is being subscribed at MainModel constructor. There you can notice how on iOS and Android Locations list never gets updated.

Workaround

No response

Works on UWP/WinUI

Yes

Environment

No response

NuGet package version(s)

Affected platforms

Android, iOS

IDE

Visual Studio 2022

IDE version

No response

Relevant plugins

No response

Anything else we need to know?

No response

[jeromelaban]

Thanks for the report. GeoLocator is functioning properly, you can find an example as shown in the Uno Gallery here:

https://github.com/unoplatform/Uno.Gallery/blob/7559ae7f013aa3d2c8964ad1ccd21c5ce93255eb/Uno.Gallery/Uno.Gallery.Shared/Views/SamplePages/GeolocatorSamplePage.xaml.cs#L44

Note that you have to request for access first.

[ajpinedam]

I found a workaround that seems to work for both mobile platforms (iOS and Android).

Before subscribing to the PositionChanged event, call the GetGeopositionAsync() method on the Geolocator instance.

if (accessStatus == GeolocationAccessStatus.Allowed)
{
    _ = await _geolocator.GetGeopositionAsync();

    _geolocator.PositionChanged += Locator_PositionChanged;
}

I am still looking for a final solution.

cc: @mcocaroUX

[mcocaroUX]

I will try that, thanks @ajpinedam

[mcocaroUX]

@ajpinedam Seems that this workaround only works for Android and not on iOS

[ajpinedam]

@mcocaroUX really!? Sorry, didn't validate on iOS.

The good thing is that a final fix was merged earlier this week and this should be available in the latest dev-built. This fix cover both platforms (iOS and Android)

PR: #16209