GPS locations - service not available

Galaxy Watch for Tizen Tizen .NET APIs
1

Hi, I try this:

            using Tizen.Location;
            
            CheckPrivilegesGPS();

            Tizen.Location.Locator locator;
            locator = new Locator(LocationType.Gps);
            locator.Start();

            Tizen.Location.Location location = locator.GetLocation();

            if (location != null)
            {
                latitude.Text = location.Latitude.ToString();
                longitude.Text = location.Longitude.ToString();
            }

but I gat catch error: service is not available. In my watch settings I have ON location service, I have location privilege in manifext.xml and I check privileges like:

            CheckResult result = PrivacyPrivilegeManager.CheckPermission("http://tizen.org/privilege/location");

But still get the same error. Do someone know what is issue? :confused:

2

CheckPermission() only checks if the permission is already granted to your app. You have to also run RequestPermission() to actually request the permission. You can wrap the whole thing in a simple Task-based async method:

public async Task<bool> CheckPrivilege(string privilege)
{
    switch (PrivacyPrivilegeManager.CheckPermission(privilege))
    {
        case CheckResult.Allow:
            return true;
        case CheckResult.Deny:
            return false;
        case CheckResult.Ask:
            if (!PrivacyPrivilegeManager.GetResponseContext(privilege).TryGetTarget(out var context))
                return false;

            var tcs = new TaskCompletionSource<bool>();
            context.ResponseFetched += (s, e) =>
            {
                if (e.cause == CallCause.Answer)
                    tcs.SetResult(e.result == RequestResult.AllowForever);
                else
                    tcs.SetResult(false);
            };
            PrivacyPrivilegeManager.RequestPermission(privilege);

            return await tcs.Task;
        default:
            return false;
    }
}

and invoke it like this:

bool granted = await CheckPrivilege("http://tizen.org/privilege/location");
3

Sorry, this is what I have, my all code:

    private void CheckPrivilegesGPS()
    {
        try
        {
            /// Check location permission
            CheckResult result = PrivacyPrivilegeManager.CheckPermission("http://tizen.org/privilege/location");

            switch (result)
            {
                case CheckResult.Allow:
                    break;
                case CheckResult.Deny:
                    break;
                case CheckResult.Ask:
                    /// Request to privacy popup
                    PrivacyPrivilegeManager.RequestPermission("http://tizen.org/privilege/location");
                    break;
            }
        }
        catch (Exception ex)
        {
            DisplayAlert("Chyba0", ""+ex, "OK");
        }
    }
    
    public async void GetGPS()
    {
        try
        {
            CheckPrivilegesGPS();
            Tizen.Location.Locator locator;
            locator = new Locator(LocationType.Gps);
            locator.Start();

            Tizen.Location.Location location = locator.GetLocation();

            if (location != null)
            {
                latitude.Text = location.Latitude.ToString();
                longitude.Text = location.Longitude.ToString();
            }
            else
            {
                await DisplayAlert("Chyba0", "location is null", "OK");
            }
        }
        catch (FeatureNotSupportedException fnsEx)
        {
            // Handle not supported on device exception
            await DisplayAlert("Chyba1", fnsEx.Message, "OK");
        }
        catch (FeatureNotEnabledException fneEx)
        {
            // Handle not enabled on device exception
            await DisplayAlert("Chyba2", fneEx.Message, "OK");
        }
        catch (PermissionException pEx)
        {
            // Handle permission exception
            await DisplayAlert("Chyba3", pEx.Message, "OK");
        }
        catch (Exception ex)
        {
            // Unable to get location
            await DisplayAlert("Chyba4", ex.Message, "OK");
        }
    }

And everytime I get the last catch - Unable to get location

4

Sorry for misunderstanding your question.

I guess the log message literally means that the location data is not available from the GPS sensor (due to e.g. weak signal). You may try one of the following:

  • Move your device to another location and try again
  • Change the LocationType to LocationType.Hybrid (less accurate)
  • Use await GetLocationAsync() with a timeout as an argument (null is returned after timeout)
5

Thank you very much! This work for me, combination hybrid + await GetLocationAsync()
but somehow it wont work with my other functions :frowning:

    public MainPage()
    {
        InitializeComponent();
       
        //StartAccelerometer(); // with this I get segmenation faul...
        //AccelerometerReadData();

        GetGPS(); // this work :)
    }


    public void StartAccelerometer()
    {
        SensorSpeed speed = SensorSpeed.Default; // Set speed delay for monitoring changes.
        Xamarin.Essentials.Accelerometer.Start(speed);
    }

    private void AccelerometerReadData()
    {
        Xamarin.Essentials.Accelerometer.ReadingChanged += Accelerometer_ReadingChanged;
    }

    private void Accelerometer_ReadingChanged(object sender, AccelerometerChangedEventArgs e)
    {
        var data = e.Reading;
        
        var accX = data.Acceleration.X.ToString();
        var accY = data.Acceleration.Y.ToString();
        var accZ = data.Acceleration.Z.ToString();
   }
6

OK I dont know what I do, but on second build and test on real device it work :slight_smile: