具有完整功能的 Xamarin Forms Location [英] Xamarin Forms Location with Full features

问题描述

您好，我正在尝试以 Xamarin 形式构建一个应用程序，该应用程序对定位服务有很大的依赖性.

Hi I am trying to build one Application in Xamarin forms which has huge dependency on location services.

使用 Xamarin.Essentials 我能够获取位置，但在 Android 中它给出最后一个已知位置，有时它不是那么准确.

Using Xamarin.Essentials I am able to get the location, but in Android its give the last known location and sometime its not that much accurate.

问题 1.

但我无法添加位置侦听器，因此一旦用户更改位置，我就可以收到通知.

But I am not able to add Location Listener so that once user change location, I can get notified.

问题 2.如何准确知道用户是否禁用了电话位置或应用位置?

Problem 2. How to exactly know whether user has disabled Phone Location or App Location ?

请指导我.. 提前致谢

Please guide me.. Thanks in advance

推荐答案

问题 #1

我不知道，但我认为 Xamarin.Essentials 还没有位置侦听器功能，可能是错误的，但您可以使用这个 plugin 来自 jamesmontemagno(也是 Xamarin.Essentials 的主要开发者)，这个插件可以像这样跟踪地理位置的变化:

I don't know, but i think Xamarin.Essentials doesn't have Location Listener feature yet, might be wrong, but you can use this plugin from jamesmontemagno (also a main developer of Xamarin.Essentials), this plugin can track geolocation changes like this:

CrossGeolocator.Current.IsListening

问题 2

遵循文档在这里，您会收到以下情况的例外:未授予权限或未启用/支持位置

Following the documentation here, you receive an exception for the following cases: permission was not granted or if the location is not enabled/supported

try
{
    var location = await Geolocation.GetLastKnownLocationAsync();

    if (location != null)
    {
        Console.WriteLine($"Latitude: {location.Latitude}, Longitude: {location.Longitude}, Altitude: {location.Altitude}");
    }
}
catch (FeatureNotSupportedException fnsEx)
{
    // Handle not supported on device exception
}
catch (FeatureNotEnabledException fneEx)
{
    // Handle not enabled on device exception
}
catch (PermissionException pEx)
{
    // Handle permission exception
}
catch (Exception ex)
{
    // Unable to get location
}

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