makeimagerequest

import Toybox.Background;
import Toybox.Graphics;
import Toybox.Lang;
import Toybox.System;
import Toybox.Communications;
import Toybox.Application;
import Toybox.WatchUi;

(:background)
class BackgroundService extends ServiceDelegate {
    function initialize() {
        ServiceDelegate.initialize();
    }

    function onTemporalEvent() as Void {
        Communications.makeImageRequest(
            "https://services.garmin.com/appsLibraryExternalServices/api/icons/a41f0afd-4802-4406-a8d0-d47336e5d988",
            null,
            {}, method(:onReceiveImage)
        );
     }
    function onReceiveImage(responseCode as Number, data as Null or BitmapReference or BitmapResource)  as Void {
        System.println("onReceiveImage: response code = " + responseCode);
        if (responseCode == 200 && data != null) {
            // Storage.setValue(bitmapKey, data); // generates warning/error at typecheck level 2/3

            // a spurious cast is required to make the type checker happy (arguably this type of cast
            // is bad because it should be used sparingly - or not at all, and it gives the dev
            // a false sense of security)
            Storage.setValue(bitmapKey, data as BitmapResource);
        }
        Background.exit(responseCode);
    }
}