public Task <OfflineRegionDto> CreateOfflineRegion(LatLngBoundsDto bounds, int zoomLevel = 8)
{
var tcs = new TaskCompletionSource <OfflineRegionDto>();
LatLngBounds latLngBounds = new LatLngBounds.Builder()
.Include(new LatLng(bounds.Ne.Latitude, bounds.Ne.Longitude))
.Include(new LatLng(bounds.Sw.Latitude, bounds.Sw.Longitude))
.Build();
var offlineDefinition = new OfflineTilePyramidRegionDefinition(Style.MapboxStreets, latLngBounds, 1,
zoomLevel,
Application.Context.Resources.DisplayMetrics.Density);
var jsonObject = new JSONObject();
jsonObject.Put("REGION_NAME", "Chennai");
string json = jsonObject.ToString();
byte[] metadata = Encoding.UTF8.GetBytes(json);
_offlineManager.CreateOfflineRegion(offlineDefinition, metadata,
new CreateOfflineRegionCallback(Application.Context)
{
OnListCallback = region =>
{
region.SetDownloadState(OfflineRegion.StateActive);
tcs.SetResult(Transform(region));
},
OnErrorCallback = error => { tcs.SetResult(null); }
});
return(tcs.Task);
}
public Task <OfflinePack> DownloadMap(OfflinePackRegion region, Dictionary <string, string> packInfo)
{
var tcs = new TaskCompletionSource <OfflinePack>();
var latLngBounds = new LatLngBounds.Builder()
.Include(region.Bounds.NorthEast.ToLatLng()) // Northeast
.Include(region.Bounds.SouthWest.ToLatLng()) // Southwest
.Build();
var definition = new OfflineTilePyramidRegionDefinition(
region.StyleURL,
latLngBounds,
region.MinimumZoomLevel,
region.MaximumZoomLevel,
Android.App.Application.Context.Resources.DisplayMetrics.Density);
byte[] metadata = null;
if (packInfo != null)
{
//var binFormatter = new BinaryFormatter();
//var mStream = new MemoryStream();
//binFormatter.Serialize(mStream, packInfo);
//metadata = mStream.ToArray();
try
{
var jsonObject = new JsonObject();
foreach (KeyValuePair <string, string> pair in packInfo)
{
jsonObject.AddProperty(pair.Key, pair.Value);
}
var json = new Java.Lang.String(jsonObject.ToString());
metadata = json.GetBytes(JSON_CHARSET);
System.Diagnostics.Debug.WriteLine("Encoding metadata succeeded: " + metadata.Length.ToString());
}
catch (Exception ex)
{
System.Diagnostics.Debug.WriteLine("Failed to encode metadata: " + ex.Message);
}
}
offlineManager.CreateOfflineRegion(
definition,
metadata,
new CreateOfflineRegionCallback(
(reg) =>
{
reg.SetDownloadState(OfflineRegion.StateActive);
tcs.TrySetResult(reg.ToFormsPack());
},
(msg) =>
{
System.Diagnostics.Debug.WriteLine("[ERROR] Couldn't create offline pack: " + msg);
tcs.TrySetResult(null);
}
)
);
return(tcs.Task);
}
public static OfflinePackRegion ToFormsRegion(this OfflineTilePyramidRegionDefinition definition)
{
return(new OfflinePackRegion {
Bounds = new Bounds(new Position(definition.Bounds.SouthWest.Latitude, definition.Bounds.SouthWest.Longitude),
new Position(definition.Bounds.NorthEast.Latitude, definition.Bounds.NorthEast.Longitude)),
StyleURL = definition.StyleURL,
MinimumZoomLevel = definition.MinZoom,
MaximumZoomLevel = definition.MaxZoom
});
}