我正在构建Xamarin应用,对于地理位置,我正在使用GeolocatorPlugin
问题在于,一旦代码想要获得该位置,该代码就会存在而不会发出警告。
我的课程字段:
private Position position;
private IGeolocator locator = CrossGeolocator.Current;
我的页面构造函数:
public MainPage()
{
InitializeComponent();
locator.PositionChanged += Locator_PositionChanged;
locator.PositionError += Locator_PositionError;
}
OnAppearing事件正在调用getLocationPermission:
private async Task GetLocationPermission()
{
var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.LocationWhenInUse);
if (status != PermissionStatus.Granted)
{
//Not granted, request permission
if (await CrossPermissions.Current.ShouldShowRequestPermissionRationaleAsync(Permission.LocationWhenInUse))
{
// This is not the actual permission request
await DisplayAlert("Need your permission", "We need to access your location", "Ok");
}
// This is the actual permission request
var results = await CrossPermissions.Current.RequestPermissionsAsync(Permission.LocationWhenInUse);
if (results.ContainsKey(Permission.LocationWhenInUse))
status = results[Permission.LocationWhenInUse];
}
//Already granted, go on
if (status == PermissionStatus.Granted)
{
//Granted, get the location
GetLocation();
await GetVenues();
await locator.StartListeningAsync(TimeSpan.FromMinutes(30), 500);
}
else
{
await DisplayAlert("Access to location denied", "We don't have access to your location.", "OK");
}
}
该权限被授予并获取GetLocation()方法:
private async void GetLocation()
{
//var locator = CrossGeolocator.Current;
try
{
var myPosition = await locator.GetPositionAsync();
position = new Position(myPosition.Latitude, myPosition.Longitude);
}
catch (Exception ex)
{
throw;
}
if (position == null)
{
//Handle exception
}
}
使用locator.GetPositionAsync()到达该行后,它将停止。没有引发异常,也不会引发PositionError。
我不知道为什么,但是一开始它只能工作一次,此后再也没有工作。
Android Emulator中的位置设置如下: