GeolocationAccessStatus

GeolocationAccessStatus

我正在使用Windows 10 SDK(内部版本10586)开发Windows移动应用程序,我需要订阅Geolocator的StatusChanged事件。

问题是,当我使用“设置”>“位置”菜单关闭地理位置时,未调用我的OnStatusChanged方法。

    public async Task StartTracking()
    {
        // Request permission to access location
        var accessStatus = await Geolocator.RequestAccessAsync();

        switch (accessStatus)
        {
            case GeolocationAccessStatus.Allowed:
                _geolocator = new Geolocator
                {
                    ReportInterval = 2000,
                    MovementThreshold = 10d,
                    DesiredAccuracyInMeters = 10,
                    DesiredAccuracy = PositionAccuracy.High
                };
                _geolocator.PositionChanged += OnPositionChanged;
                _geolocator.StatusChanged += OnStatusChanged;
                break;

            case GeolocationAccessStatus.Denied:
                Messenger.Default.Send(new GeolocationDeniedAccessMessage(true));
                break;

            case GeolocationAccessStatus.Unspecified:
                Messenger.Default.Send(new GeolocationDeniedAccessMessage(true));
                break;
        }
    }

    private void OnStatusChanged(Geolocator sender, StatusChangedEventArgs e)
    {
        switch (e.Status)
        {
            case PositionStatus.Ready:
                Messenger.Default.Send(new GeolocationAvailabilityMessage(true));
                Messenger.Default.Send(new GeolocationDeniedAccessMessage(false));
                break;

            case PositionStatus.Initializing:
                break;

            case PositionStatus.NoData:
                Messenger.Default.Send(new GeolocationAvailabilityMessage(false));
                break;

            case PositionStatus.Disabled:
                Messenger.Default.Send(new GeolocationDeniedAccessMessage(true));
                break;

            case PositionStatus.NotInitialized:
                break;

            case PositionStatus.NotAvailable:
                Messenger.Default.Send(new GeolocationAvailabilityMessage(false));
                break;
        }
    }

最佳答案

更新

问题似乎是EventHandler的注册。如果一旦调用StartTracking()禁用了位置,则GeolocationAccessStatus将被“拒绝”,因此一旦用户在设置中打开位置跟踪功能,就不会注册EventHandler,也不会调用OnStatusChanged
尝试将Geolocator的初始化移出GeolocationAccessStatus.Allowed案例



确保已在清单Location的功能选项卡中选择了package.appxmanifest

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