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GeocoderBackend.cs
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GeocoderBackend.cs
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using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Android.Content;
using Android.Locations;
using AGeocoder = Android.Locations.Geocoder;
namespace Xamarin.Forms.Maps.Android
{
internal class GeocoderBackend
{
readonly Context _context;
AGeocoder _geocoder;
AGeocoder AndroidGeocoder => _geocoder ?? (_geocoder = new AGeocoder(_context));
public GeocoderBackend(Context context)
{
_context = context;
}
public void Register()
{
Geocoder.GetPositionsForAddressAsyncFunc = GetPositionsForAddressAsync;
Geocoder.GetAddressesForPositionFuncAsync = GetAddressesForPositionAsync;
}
public async Task<IEnumerable<Position>> GetPositionsForAddressAsync(string address)
{
IList<Address> addresses = await AndroidGeocoder.GetFromLocationNameAsync(address, 5);
return addresses.Select(p => new Position(p.Latitude, p.Longitude));
}
public async Task<IEnumerable<string>> GetAddressesForPositionAsync(Position position)
{
IList<Address> addresses = await AndroidGeocoder.GetFromLocationAsync(position.Latitude, position.Longitude, 5);
return addresses.Select(p =>
{
IEnumerable<string> lines = Enumerable.Range(0, p.MaxAddressLineIndex + 1).Select(p.GetAddressLine);
return string.Join("\n", lines);
});
}
}
}