// A click handler for the save map button
private void SaveButtonClicked(object sender, EventArgs e)
{
try
{
// Get information for the new portal item
var title = MapTitleEntry.Text;
var description = MapDescriptionEntry.Text;
var tags = MapTagsEntry.Text.Split(',');
// Make sure all required info was entered
if (string.IsNullOrEmpty(title) || string.IsNullOrEmpty(description) || tags.Length == 0)
{
throw new Exception("Please enter a title, description, and some tags to describe the map.");
}
// Create a new OnSaveMapEventArgs object to store the information entered by the user
var mapSavedArgs = new SaveMapEventArgs(title, description, tags);
// Raise the OnSaveClicked event so the main activity can handle the event and save the map
OnSaveClicked(this, mapSavedArgs);
// Close the dialog
Navigation.PopAsync();
}
catch (Exception ex)
{
// Show the exception message (dialog will stay open so user can try again)
DisplayAlert("Error", ex.Message, "OK");
}
}
// Event handler to get information entered by the user and save the map
private async void SaveMapAsync(object sender, SaveMapEventArgs e)
{
// Get the current map
Map myMap = MyMapView.Map;
try
{
// Show the progress bar so the user knows work is happening
SaveMapProgressBar.IsVisible = true;
// Make sure the user is logged in to ArcGIS Online
Credential cred = await EnsureLoggedInAsync();
AuthenticationManager.Current.AddCredential(cred);
// Get information entered by the user for the new portal item properties
string title = e.MapTitle;
string description = e.MapDescription;
string[] tags = e.Tags;
// Apply the current extent as the map's initial extent
myMap.InitialViewpoint = MyMapView.GetCurrentViewpoint(ViewpointType.BoundingGeometry);
// Export the current map view for the item's thumbnail
RuntimeImage thumbnailImage = await MyMapView.ExportImageAsync();
// See if the map has already been saved (has an associated portal item)
if (myMap.Item == null)
{
// Get the ArcGIS Online portal (will use credential from login above)
ArcGISPortal agsOnline = await ArcGISPortal.CreateAsync(new Uri(ArcGISOnlineUrl));
// Save the current state of the map as a portal item in the user's default folder
await myMap.SaveAsAsync(agsOnline, null, title, description, tags, thumbnailImage);
// Report a successful save
await((Page)Parent).DisplayAlert("Map Saved", "Saved '" + title + "' to ArcGIS Online!", "OK");
}
else
{
// This is not the initial save, call SaveAsync to save changes to the existing portal item
await myMap.SaveAsync();
// Get the file stream from the new thumbnail image
Stream imageStream = await thumbnailImage.GetEncodedBufferAsync();
// Update the item thumbnail
((PortalItem)myMap.Item).SetThumbnailWithImage(imageStream);
await myMap.SaveAsync();
// Report update was successful
await((Page)Parent).DisplayAlert("Updates Saved", "Saved changes to '" + myMap.Item.Title + "'", "OK");
}
}
catch (Exception ex)
{
// Show the exception message
await((Page)Parent).DisplayAlert("Unable to save map", ex.Message, "OK");
}
finally
{
// Hide the progress bar
SaveMapProgressBar.IsVisible = false;
}
}
