RedTahr

using System.Collections.Generic;
using System.Collections.ObjectModel;

// from Xamarin Monkey demo - http://motzcod.es/post/93792500152/custom-listview-viewcells-in-xamarin-forms
namespace Interact.Core.Helper {
    public class Grouping<TKey, TValue> : ObservableCollection<TValue> {
        public TKey Key { get; private set; }
        public Grouping(TKey key, IEnumerable<TValue> items) {
            Key = key;
            foreach (var item in items)

RedTahr

        // Xamarin Evolve 2014: Extending Xamarin.Forms with Custom Controls - Jason Smith, Xamarin https://www.youtube.com/watch?v=pIZ8G47KPIM
        protected async override void OnAppearing() {
            base.OnAppearing();

            var loadingView = new ActivityIndicator {
                VerticalOptions = LayoutOptions.Center,
                HorizontalOptions = LayoutOptions.Center,
                IsRunning = true
            };

RedTahr

// http://developer.xamarin.com/recipes/ios/content_controls/map_view/display_a_location/

        /// <summary>Converts miles to latitude degrees</summary>
        public static double MilesToLatitudeDegrees(double miles) {
            double earthRadius = 3960.0; // in miles
            double radiansToDegrees = 180.0 / Math.PI;
            return (miles / earthRadius) * radiansToDegrees;
        }

        /// <summary>Converts miles to longitudinal degrees at a specified latitude</summary>

RedTahr

        // http://social.msdn.microsoft.com/forums/windowsapps/en-us/b639cd8a-30c2-48cf-99be-559f34cbfa79/convert-string-to-color-in-metro
        public static System.Windows.Media.Color GetColorFromHexString(string hexValue) {
            hexValue = hexValue.Substring(1, 6); // string will be passed in with a leading #
            byte a = 0xff;// Convert.ToByte(hexValue.Substring(0, 2), 16);
            var r = Convert.ToByte(hexValue.Substring(0, 2), 16);
            var g = Convert.ToByte(hexValue.Substring(2, 2), 16);
            var b = Convert.ToByte(hexValue.Substring(4, 2), 16);
            return System.Windows.Media.Color.FromArgb(a, r, g, b);
        }

RedTahr

        // http://stackoverflow.com/questions/10310917/uicolor-from-hex-in-monotouch
        public static UIColor GetColorFromHexString(string hexValue) {
            hexValue = hexValue.Substring(1, 6); // string will be passed in with a leading #
            var r = Convert.ToByte(hexValue.Substring(0, 2), 16);
            var g = Convert.ToByte(hexValue.Substring(2, 2), 16);
            var b = Convert.ToByte(hexValue.Substring(4, 2), 16);
            return UIColor.FromRGB(r, g, b);
        }

RedTahr

        // "return" "version" "name" - names aren't syntactically correct (they're probably upper case for starters)
        // 21 5.0 lollipop
        // 20 4.4.2W kitkat wear
        // 19 4.4.2 kitkat
        // 18 4.3.1 jelly bean mr2
        // 17 4.2.2 jelly bean mr1
        // 16 4.1.2 jelly bean
        // 15 4.0.3 ice-cream sandwich mr1
        // 14 4.0 ice-cream sandwich
        // 13 3.2 honeycomb mr2