Xamarin Geolocator does not return anything to me

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Xamarin Geolocator does not return anything to me

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#1 by (3 votes)

2

Hi, I'm using Xamarin and GeoLocator to make an application with Geolocation, but it does not return the data I'm passing, and in debug, it sends me the following error:

This error only appears when I click the button that executes the method I want. Prior to this I throw no error. The first time I ran it, I activated the gps, but when I continued using it, I did not even ...

This is my code:

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace OwService {
  [XamlCompilation(XamlCompilationOptions.Compile)]
  public partial class PageGps: ContentPage {
    public PageGps() {
      InitializeComponent();
      btnGetLoc.Clicked += BtnGetLoc_Clickied;

    }

    private async void BtnGetLoc_Clickied(object sender, EventArgs e) {
      await RetriveLocation();
    }

    private async Task RetriveLocation() {
      var locator = CrossGeolocator.Current;
      locator.DesiredAccuracy = 10;

      var position = await locator.GetPositionAsync(TimeSpan.FromSeconds(10000), null, true);

      txtLat.Text = "Latitude: " + position.Latitude.ToString();
      txtLong.Text = "Longitude: " + position.Longitude.ToString();
    }

  }
}

c# xamarin.forms xamarin geo-localizacion

asked by E.Rawrdríguez.Ophanim 07.02.2018 в 02:07

source

1 answer

Get input data using Jquery Combine prepared transactions and queries

score 3 · Accepted Answer

First, you need to make sure that you have implemented the PermissionsPlugin requirement.

In your MainActivity, you need to add the following method.

public override void OnRequestPermissionsResult(int requestCode, string[] permissions, Permission[] grantResults)
{
    PermissionsImplementation.Current.OnRequestPermissionsResult(requestCode, permissions, grantResults);
}

For the Permissions Plugin to work, you need to make sure that in your OnCreate method you set the CurrentActivity. That means adding the following line before LoadApplication(new App());

Plugin.CurrentActivity.CrossCurrentActivity.Current.Activity = this;

Finally, you need to make sure you take into account the permissions. I would recommend changing your implementation as follows.

        public async Task RetriveLocation()
        {
            try
            {
                var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Location);
                if (status != PermissionStatus.Granted)
                {
                    if (await CrossPermissions.Current.ShouldShowRequestPermissionRationaleAsync(Permission.Location))
                    {
                        await DisplayAlert("Need location", "Gunna need that location", "OK");
                    }

                    var results = await CrossPermissions.Current.RequestPermissionsAsync(Permission.Location);
                    //Best practice to always check that the key exists
                    if (results.ContainsKey(Permission.Location))
                        status = results[Permission.Location];
                }

                if (status == PermissionStatus.Granted)
                {
                    var position = await CrossGeolocator.Current.GetPositionAsync(TimeSpan.FromMilliseconds(10000));
                    txtLat.Text = "Latitude: " + position.Latitude;
                    txtLong.Text = "Longitude: " + position.Longitude;
                }
                else if (status != PermissionStatus.Unknown)
                {
                    await DisplayAlert("Location Denied", "Can not continue, try again.", "OK");
                }
            }
            catch (Exception ex)
            {

                txtLat.Text = "Error: " + ex;
                txtLong.Text = "Error: " + ex;
            }
        }

Here is a test repository that works with the code mentioned above. link

Source: link