private async Task ExecuteLoadItemsCommand()
        {
            if (IsBusy)
                return;

            IsBusy = true;

            try{
                var httpClient = new HttpClient();
                var feed = "http://api.espn.com/v1/sports/soccer/fifa.world/teams?apikey=trs58u4j7gw4aat7ck8dsmgc";
                var responseString = await httpClient.GetStringAsync(feed);

                Teams.Clear();
                var items = await ParseFeed(responseString);
                foreach (var item in items.OrderBy(t => t.Name))
                {
                    Teams.Add(item);
                }
                keepTeams = Teams.ToList();
            } catch (Exception) {
                var page = new ContentPage();
                page.DisplayAlert ("Error", "Unable to load teams.", "OK", null);
            }

            IsBusy = false;
        }
		public async Task ExecuteLoadStatsCommand()
		{
			if (IsBusy)
				return;

			IsBusy = true;

			try
			{
				var adminManager = new AdminManager(Settings.AccessToken);

				Names.Clear();
				foreach(var name in await adminManager.PopularNames())
				{
					Names.Add(name);
				}
			}
			catch (Exception ex)
			{
				var page = new ContentPage();
				page.DisplayAlert("Error", "Unable to load.", "OK"); ;
			}
			finally
			{
				IsBusy = false;
			}
		}
        private void ExecuteLoadItemsCommand()
        {
            if (IsBusy)
                return;

            IsBusy = true;

            try
            {
                KnockoutMatches.Clear();
                var result = MatchService.GetKnockoutMatches();

                foreach (var item in result)
                {
                    KnockoutMatches.Add(item);
                }

            }
            catch (Exception)
            {
                var page = new ContentPage();
                page.DisplayAlert("Error", "Unable to load matches.", "OK", null);
            }

            IsBusy = false;
        }
		public async Task ExecuteLoadFlagsCommand()
		{
			if (IsBusy)
				return;

			IsBusy = true;

			try
			{
				
				var userManager = new UserManager(Settings.AccessToken);
			
				var flags = await userManager.GetFlags();
				//Use linq to sorty our monkeys by name and then group them by the new name sort property
				var sorted = from flag in flags
							 orderby flag.AlertLevel
							 group flag by flag.AlertLevel.ToString() into flagGroup
							 select new Grouping<string, Flag>(flagGroup.Key, flagGroup);

				//create a new collection of groups
				FlagsGrouped = new ObservableCollection<Grouping<string, Flag>>(sorted);
				OnPropertyChanged("FlagsGrouped");
			}
			catch (Exception ex)
			{
				var page = new ContentPage();
				page.DisplayAlert("Error", "Unable to load flags.", "OK"); ;
			}
			finally
			{
				IsBusy = false;
			}
		}
		public async Task ExecuteLoadStatsCommand()
		{
			if (IsBusy)
				return;

			IsBusy = true;

			try
			{
				var adminManager = new AdminManager(Settings.AccessToken);

				RegDates.Clear();
				foreach(var reg in await adminManager.TotalRegistrations())
				{
					RegDates.Add(new MyRegDate
						{
							Title = new DateTime(reg.Year, reg.Month, reg.Day).ToString("D"),
							Detail = reg.Total.ToString()
						});
				}
			}
			catch (Exception ex)
			{
				var page = new ContentPage();
				page.DisplayAlert("Error", "Unable to load.", "OK"); ;
			}
			finally
			{
				IsBusy = false;
			}
		}
    public async Task ExecuteArticleCommand()
    {
      if (IsBusy)
        return;

      IsBusy = true;
      LoadArticleCommand.ChangeCanExecute();
      try
      {
       GetArticleHtmlandUpdate();
       
 
          Expand = "    CLOSE ▲";
          OnPropertyChanged("Expand");
    
      }
			catch (Exception ex)
      {
        var page = new ContentPage();
        page.DisplayAlert("Error", "Unable to load Article Content.", "OK");

      }
      IsBusy = false;
      LoadArticleCommand.ChangeCanExecute();
    }
		private async Task ExecuteLoadItemsCommand()
		{
			if (IsBusy)
				return;

			IsBusy = true;

			try{
        var responseString = string.Empty;
				using(var httpClient = new HttpClient())
        {
				  var feed = "http://feeds.hanselman.com/ScottHanselman";
				  responseString = await httpClient.GetStringAsync(feed);
        }

				FeedItems.Clear();
				var items = await ParseFeed(responseString);
				foreach (var item in items)
				{
					FeedItems.Add(item);
				}
			} catch (Exception ex) {
				var page = new ContentPage();
				var result = page.DisplayAlert ("Error", "Unable to load blog.", "OK");
			}

			IsBusy = false;
		}
        public MainPage()
        {
            button = new Button
            {
                Text = "Click me",
            };

            label = new Label
            {
                XAlign = TextAlignment.Center,
                Text = "Welcome to Xamarin Forms!"
            };
            button.Clicked += async (sender, e) =>
            {
                var data = "Cryptographic example";
                var pass = "******";

                var contentPage = new ContentPage();
                var salt = Crypto.CreateSalt(16);
                await contentPage.DisplayAlert("Alert", "Encrypting String " + data + ", with salt " + BitConverter.ToString(salt), "OK");
                var bytes = Crypto.EncryptAes(data, pass, salt);
                await contentPage.DisplayAlert("Alert", "Encrypted, Now Decrypting", "OK");
                var str = Crypto.DecryptAes(bytes, pass, salt);
                await contentPage.DisplayAlert("Alert", "Decryted " + str, "OK");
            };

            this.Title = "Crypto Forms";
            // The root page of your application
            this.Content = new StackLayout
            {
                VerticalOptions = LayoutOptions.Center,
                Children =
                {
                    label,
                    button

                }
            };
        }
Exemple #9
0
    public App()
    {
      var editField = new Entry
      {
        Placeholder = "Enter text for setting",
        Text = SettingsSample.Helpers.Settings.GeneralSettings
      };
      var buttonSave = new Button
      {
        Text = "Save Setting"
      };

      var buttonGet = new Button
      {
        Text = "Get Setting"
      };
      // The root page of your application
      MainPage = new ContentPage
      {
        Content = new StackLayout
        {
          VerticalOptions = LayoutOptions.Center,
          Children = {
						new Label {
							XAlign = TextAlignment.Center,
							Text = "Enter value to save to settings:"
						}, editField,
            buttonSave,
            buttonGet
					}
        }
      };

      buttonSave.Clicked += (sender, args) =>
        {
          SettingsSample.Helpers.Settings.GeneralSettings = editField.Text;
        };

      buttonGet.Clicked += (sender, args) =>
        {
          MainPage.DisplayAlert("Current Value:", SettingsSample.Helpers.Settings.GeneralSettings, "OK");
        };
    }
		public async Task ExecuteLoadStatsCommand()
		{
			if (IsBusy)
				return;

			IsBusy = true;

			try
			{
				var adminManager = new AdminManager(Settings.AccessToken);
				var avatarManager = new AvatarManager(Settings.AccessToken);
				Count = await adminManager.TotalAvatarCount();
				var avas = await avatarManager.GetStaticAvatars();
				Avatars.Clear();
				var items = await adminManager.PopularAvatars();
				foreach(var avatar in items.OrderByDescending(a => a.Count))
				{
					var myava = avas.FirstOrDefault(a => a.Id == avatar.AvatarId);

					if (myava == null)
						continue;

					Avatars.Add(new MyAvatar
						{
							Count = avatar.Count.ToString(),
							Location = myava.Location,
							Url = EndPoints.BaseUrl + myava.Location
						});
				}
			}
			catch (Exception ex)
			{
				var page = new ContentPage();
				page.DisplayAlert("Error", "Unable to load.", "OK"); ;
			}
			finally
			{
				IsBusy = false;
			}
		}
		private async Task ExecuteLoadItemsCommand()
		{
			if (IsBusy)
				return;

			IsBusy = true;

			try{
				/*
				var items = App.WorkManager.GetWorkItems();
				foreach(var item in items)
				{
					workItems.Add(item);
				}
				*/
			} catch (Exception ex) {
				var page = new ContentPage();
				var result = page.DisplayAlert ("Error", "Unable to load work items.", "OK");
			}

			IsBusy = false;
		}
        public App()
        {
            var loginButton = new Button { Text = "Login", StyleId = "loginButton" };

            var mainPage = new ContentPage {
                Content = new StackLayout {
                    VerticalOptions = LayoutOptions.Center,
                    HorizontalOptions = LayoutOptions.Center,
                    Children = {
                        new Entry { Placeholder = "Username", StyleId = "username" },
                        new Entry { Placeholder = "Password", StyleId = "password" },
                        loginButton
                    }
                }
            };

            loginButton.Clicked += async (object sender, EventArgs e) => {
                await mainPage.DisplayAlert ("Login", "Logged In", "OK");
            };
            // The root page of your application
            MainPage = mainPage;
        }
		// --------------------------------------------------------------------------
		//
		// CONSTRUCTORS
		//
		// --------------------------------------------------------------------------
		public App () {
			// Create the orange image that goes on the main screen of the app
			var orangeImage = new CustomImage { Aspect = Aspect.Fill };
			orangeImage.Source = "orange_square.png";

			// Create a ContentPage to use as the view of the app.
			var page = new ContentPage {
				Content = new StackLayout {
					VerticalOptions = LayoutOptions.Center,
					Children = { orangeImage }
				}
			};

			// When the image dispatches a tap event (custom event, see CustomImage.cs),
			// then display an alert.
			orangeImage.TapEvent += (object sender, PointEventArgs e) => {
				page.DisplayAlert("Tap!", String.Format("({0}, {1})", e.X, e.Y), "Cancel");
			};

			// Set the main page of the app.
			MainPage = page;
		}
        private async Task ExecuteLoadItemsCommand()
        {
            if (IsBusy)
                return;

            IsBusy = true;

            try
            {
                Result.Clear();
                using(var httpClient = new HttpClient())
                {
                    for (int i = 1; i <= 15; i++)
                    {
                        var feed = string.Format("http://footballdb.herokuapp.com/api/v1/event/world.2014/round/{0}",i);
                        var responseString = await httpClient.GetStringAsync(feed);
                        Result.AddRange(MatchService.GetMatchDay(responseString));
                    }

                    foreach(var item in Result)
                    {
                        item.HomeScore = (item.HomeScore == "" || item.HomeScore == null) ?
                            "0" : item.HomeScore;
                        item.AwayScore = (item.AwayScore == "" || item.AwayScore == null) ?
                            "0" : item.AwayScore;
                    }
                }
                this.ItemsLoaded(this, new EventArgs());
            } 
            catch (Exception) 
            {
                var page = new ContentPage();
                page.DisplayAlert ("Error", "Unable to load matches.", "OK", null);
            }

            IsBusy = false;
        }
        private async Task ExecuteLoadItemsCommand()
        {
            if (IsBusy)
                return;

            IsBusy = true;
            var error = false;
            try
            {
                var httpClient = new HttpClient();
				var feed = "http://blog.appointy.com/feed/";

                var responseString = await httpClient.GetStringAsync(feed);

                FeedItems.Clear();
                var items = await ParseFeed(responseString);
                foreach (var feedItem in items)
                {
                    FeedItems.Add(feedItem);
                }
            }
            catch
            {
                error = true;
            }

            if (error)
            {
                var page = new ContentPage();
                var result = page.DisplayAlert("Oops!", "Unable to load .", "OK");

            }


            IsBusy = false;
        }
        public static Page GetMainPage()
        {
            var page = new ContentPage()
            {
                BackgroundColor = Color.Gray
            };

            var header = new BoxView
            {
                    BackgroundColor = Color.Blue,
                    Color = Color.Blue
            };

            var wrapper = new CardsView();

            for (int i = 0; i < 1; i++) {

                var panel = new StackLayout();

                panel.Children.Add(new Label
                    {
                        Text = "I am a card: " + i + "!!!",
                        Font = Font.SystemFontOfSize(NamedSize.Large),
                        VerticalOptions = LayoutOptions.Center,
                        TextColor = Color.Black
                    });
                panel.Children.Add(new Label
                    {
                        Text = "Row 2",
                        Font = Font.SystemFontOfSize(NamedSize.Large),
                        VerticalOptions = LayoutOptions.Center,
                        TextColor = Color.Black
                    });

                panel.Children.Add(new Button
                    {Text = "Click Me",
                        Command = new Command(() => {
                            page.DisplayAlert("Click", "You clicked me!", "Ok");
                        })
                    });

                var card = new CardContentView {
                    Padding = 15,
                    CornderRadius = 5,
                    Content = panel,
                    BackgroundColor = Color.White,
                    Command = new Command(() => {
                        page.DisplayAlert("Alert", "I am a card: " + i + "!!!", "Ok");
                    })
                };

                wrapper.AddCard(card);
            }

            //            wrapper.Content = stack;

            var content = new AbsoluteLayout();
            content.Children.Add(header, new Rectangle(0, 0, 1, 0.25), AbsoluteLayoutFlags.SizeProportional);
            content.Children.Add(wrapper, new Rectangle(1, 0.25, 1, 1), AbsoluteLayoutFlags.All);

            page.Content = content;

            return new NavigationPage(page);
        }
Exemple #17
0
		private async Task ExecuteLoadItemsCommand()
		{
		    if (IsBusy)
		    {
                return;
            }

			IsBusy = true;
			var error = false;
			try
			{
                //var responseString = string.Empty;
                //using (var httpClient = new HttpClient())
                //{
                //	responseString = await httpClient.GetStringAsync(ServiceUrls.GetShops);
                //}
                //var items = JsonConvert.DeserializeObject<IList<Shop>>(responseString);
			    var items = DummyService.GetOrders();

                Orders.Clear();
				foreach (var item in items)
				{
                    Orders.Add(item);
				}
			}
			catch
			{
				error = true;
			}

			if (error)
			{
				var page = new ContentPage();
				await page.DisplayAlert("Error", "Unable to load orders.", "OK");

			}

			IsBusy = false;
		}
    public async Task ExecuteHideArticleInfoCommand()
    {
      if (IsBusy)
        return;

      IsBusy = true;
      HideArticleInfoCommand.ChangeCanExecute();
      try
      {
        if (App.ArticleInfoVisible == null) return;
        if(App.ArticleInfoVisible)
        {Expand = "    CLOSE ▲";
          ArticleInfoVisible = true;
        }
        else
        { Expand = "    EXPAND ▼"; ArticleInfoVisible = false; }
        OnPropertyChanged("Expand");
        OnPropertyChanged("ArticleInfoVisible");
      }
      catch
      {
        var page = new ContentPage();
        page.DisplayAlert("Error", "Unable to load Article Content.", "OK");

      }
      IsBusy = false;
      LoadArticleCommand.ChangeCanExecute();
    }
        public App()
        {
            var layout = new RelativeLayout();

            var label = new Label
            {
                XAlign = TextAlignment.Center,
                YAlign = TextAlignment.Center,
                Text = "Hello Floating Action Button!"
            };
            layout.Children.Add(
                label,
                xConstraint: Constraint.Constant(0),
                yConstraint: Constraint.Constant(0),
                widthConstraint: Constraint.RelativeToParent(parent => parent.Width),
                heightConstraint: Constraint.RelativeToParent(parent => parent.Height)
            );

            var normalFab = new FAB.Forms.FloatingActionButton();
            normalFab.Source = "plus.png";
            normalFab.Size = FabSize.Normal;

            layout.Children.Add(
                normalFab,
                xConstraint: Constraint.RelativeToParent((parent) =>  { return (parent.Width - normalFab.Width) - 16; }),
                yConstraint: Constraint.RelativeToParent((parent) =>  { return (parent.Height - normalFab.Height) - 16; })
            );

            normalFab.SizeChanged += (sender, args) => { layout.ForceLayout(); };

            var miniFab = new FAB.Forms.FloatingActionButton();
            miniFab.Source = "plus.png";
            miniFab.Size = FabSize.Mini;

            layout.Children.Add(
                miniFab,
                xConstraint: Constraint.RelativeToParent((parent) =>
                    {
                        return (parent.Width - miniFab.Width) - 16;
                    }),
                yConstraint: Constraint.RelativeToView(normalFab, (parent, view) =>
                    {
                        return (view.Y - miniFab.Height) - 16;
                    })
            );
            miniFab.SizeChanged += (sender, args) => { layout.ForceLayout(); };

            // The root page of your application
            MainPage = new ContentPage
            {
                BackgroundColor = Color.White,
                Content = layout
            };

            normalFab.Clicked += (sender, e) =>
                {
                    MainPage.DisplayAlert("Floating Action Button", "You clicked the normal FAB!", "Awesome!");
                };

            miniFab.Clicked += (sender, e) =>
                {
                    MainPage.DisplayAlert("Floating Action Button", "You clicked the mini FAB!", "Awesome!");
                };
        }
        private async Task ExecuteLoadItemsCommand()
        {
            if (IsBusy)
                return;

            IsBusy = true;
            var error = false;
            try
            {
                var httpClient = new HttpClient();
                var feed = string.Empty;

                switch (item)
                {
                    case MenuType.Hanselminutes:
                        feed = "http://feeds.podtrac.com/9dPm65vdpLL1";
                        break;
                    case MenuType.Ratchet:
                        feed = "http://feeds.feedburner.com/RatchetAndTheGeek?format=xml";
                        break;
                    case MenuType.DeveloperLife:
                        feed = "http://feeds.feedburner.com/ThisDevelopersLife?format=xml";
                        break;
                }
                var responseString = await httpClient.GetStringAsync(feed);

                FeedItems.Clear();
                var items = await ParseFeed(responseString);
                foreach (var feedItem in items)
                {
                    FeedItems.Add(feedItem);
                }
            }
            catch
            {
                error = true;
            }

            if (error)
            {
                var page = new ContentPage();
                var result = page.DisplayAlert("Error", "Unable to load podcast feed.", "OK");

            }


            IsBusy = false;
        }
		private async void ExecuteLoadTweetsCommand ()
		{
			if (IsBusy)
				return;

			IsBusy = true;
			try {

				Tweets.Clear ();
				var auth = new ApplicationOnlyAuthorizer () {
					CredentialStore = new InMemoryCredentialStore {
						ConsumerKey = "ZTmEODUCChOhLXO4lnUCEbH2I",
						ConsumerSecret = "Y8z2Wouc5ckFb1a0wjUDT9KAI6DUat5tFNdmIkPLl8T4Nyaa2J",
					},
				};
				await auth.AuthorizeAsync ();

				var twitterContext = new TwitterContext (auth);

#if !WINDOWS_PHONE
        IQueryable<LinqToTwitter.Status> queryResponse =
					(from tweet in twitterContext.Status
					where tweet.Type == StatusType.User &&
					  tweet.ScreenName == "shanselman" &&
					  tweet.Count == 100 &&
					  tweet.IncludeRetweets == true &&
					  tweet.ExcludeReplies == true
					select tweet);
					
				var queryTweets = queryResponse.ToList ();
				var tweets =
					(from tweet in queryTweets
					select new Tweet {
						StatusID = tweet.StatusID,
						ScreenName = tweet.User.ScreenNameResponse,
						Text = tweet.Text, 
						CurrentUserRetweet = tweet.CurrentUserRetweet, 
						CreatedAt = tweet.CreatedAt
					}).ToList ();
#else

				var tweets =
					await (from tweet in twitterContext.Status
					where tweet.Type == StatusType.User &&
					  tweet.ScreenName == "shanselman" &&
					  tweet.Count == 100 &&
					  tweet.IncludeRetweets == true &&
					  tweet.ExcludeReplies == true
                 select new Tweet
                 {
                   StatusID = tweet.StatusID,
                   ScreenName = tweet.User.ScreenNameResponse,
                   Text = tweet.Text,
                   CurrentUserRetweet = tweet.CurrentUserRetweet,
                   CreatedAt = tweet.CreatedAt
                 }).ToListAsync();

#endif

        foreach (var tweet in tweets) {
					Tweets.Add (tweet);
				}
			} catch (Exception ex) {
				var page = new ContentPage();
				page.DisplayAlert ("Error", "Unable to load twitter.", "OK", null);
			}

			IsBusy = false;
		}
Exemple #22
0
		async void doPhotoLibrary(PhotoListData pld)
		{
			#if __ANDROID__
			MediaPicker picker = new MediaPicker(Forms.Context);
			#else
			MediaPicker picker = new MediaPicker();
			#endif

			if (picker.IsPhotoGalleryAvailable == false)
			{
				var page = new ContentPage();
				var result = page.DisplayAlert("Warning", "Photo is not available", "OK");

				return;
			}
			else
			{
				try
				{
					var resultfile = await picker.PickPhoto();
					#if __ANDROID__
					//showDrawingView(pld);
					#else
					//showDrawingView(pld);
					#endif
				}
				catch (Exception e)
				{
				}
			}
		}
Exemple #23
0
		async void doCameraPhoto(PhotoListData pld)
		{
			#if __ANDROID__
			MediaPicker picker = new MediaPicker(Forms.Context);
			#else
			MediaPicker picker = new MediaPicker();
			#endif

			if (picker.IsCameraAvailable == false)
			{
				var page = new ContentPage();
				var result = page.DisplayAlert("Warning", "Camera is not available", "OK");

				return;
			}
			else
			{
				try
				{
					var resultfile = await picker.TakePhoto(null);
					#if __ANDROID__
					showDrawingView(pld);
					#else
					showDrawingView(pld);
					#endif
				}
				catch (Exception ex)
				{
				}
			}
		}
		public async Task ExecuteLoadUsersCommand()
		{

			if (IsBusy)
				return;

			IsBusy = true;

			try
			{
				var adminManager = new AdminManager(Settings.AccessToken);


				var users = await adminManager.FlagUserList(Flag.Id);
				//Use linq to users by name and then group them by the new name sort property
				var sorted = from user in users
							 orderby user.NickName
							 group user by (user.NickName.Length == 0 ? "?" : user.NickName[0].ToString()) into userGroup
							 select new Grouping<string, User>(userGroup.Key, userGroup);

				//create a new collection of groups
				UsersGrouped = new ObservableCollection<Grouping<string, User>>(sorted);
				OnPropertyChanged("UsersGroupeds");
			}
			catch (Exception ex)
			{
				var page = new ContentPage();
				page.DisplayAlert("Error", "Unable to load users.", "OK"); ;
			}
			finally
			{
				IsBusy = false;
			}
		}
        public App()
        {
            // The root page of your application

            var indicator = new ActivityIndicator() {
                HorizontalOptions = LayoutOptions.CenterAndExpand
            };
            indicator.IsVisible = false;
            var numeroDePersonasEntry =
                new Entry {
                Text = "5"
            };
            Stepper numeroDePersonasStepper = new Stepper
            {
                Minimum = 0,
                Maximum = 30,
                Increment = 1,
                Value = 5,
                HorizontalOptions = LayoutOptions.Center,
                VerticalOptions = LayoutOptions.CenterAndExpand
            };
            var set3Button = new Button{ Text = "3" };
            set3Button.Clicked += delegate(object sender, EventArgs e) {
                numeroDePersonasEntry.Text = "3";
                numeroDePersonasStepper.Value = 3;
            };
            var set4Button = new Button{ Text = "4" };
            set4Button.Clicked += delegate(object sender, EventArgs e) {
                numeroDePersonasEntry.Text = "4";
                numeroDePersonasStepper.Value = 4;
            };
            var set5Button = new Button{ Text = "5" };
            set5Button.Clicked += delegate(object sender, EventArgs e) {
                numeroDePersonasEntry.Text = "5";
                numeroDePersonasStepper.Value = 5;
            };
            var set6Button = new Button{ Text = "6" };
            set6Button.Clicked += delegate(object sender, EventArgs e) {
                numeroDePersonasEntry.Text = "6";
                numeroDePersonasStepper.Value = 6;
            };
            var set7Button = new Button{ Text = "7" };
            set7Button.Clicked += delegate(object sender, EventArgs e) {
                numeroDePersonasEntry.Text = "7";
                numeroDePersonasStepper.Value = 7;
            };
            var set8Button = new Button{ Text = "8" };
            set8Button.Clicked += delegate(object sender, EventArgs e){
                numeroDePersonasEntry.Text = "8";
                numeroDePersonasStepper.Value = 8;
            };
            numeroDePersonasStepper.ValueChanged += delegate(object sender, ValueChangedEventArgs e) {
                try
                {
                    int numeroDePersonas =  Int32.Parse( numeroDePersonasEntry.Text ) ;
                    numeroDePersonasEntry.Text = "" + e.NewValue ;
                }
                catch(Exception exception)
                {

                }
            };
            var totalDeLaComidaEntry =
                new Entry {
                Text = "500",

                HorizontalOptions = LayoutOptions.FillAndExpand
            };
            var plus500Button = new Button{ Text = "+500" };
            plus500Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 500f);
                }
                catch( Exception exception )
                {
                }
            };
            var plus300Button = new Button{ Text = "+300" };
            plus300Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 300f);
                }
                catch( Exception exception )
                {
                }
            };
            var plus100Button = new Button{ Text = "+100" };
            plus100Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 100f );
                }
                catch( Exception exception )
                {
                }
            };
            var plus50Button = new Button{ Text = "+50" };
            plus50Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 50f);
                }
                catch( Exception exception )
                {
                }
            };
            var plus30Button = new Button{ Text = "+30" };
            plus30Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 30f);
                }
                catch( Exception exception )
                {
                }
            };
            var plus10Button = new Button{ Text = "+10" };
            plus10Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 10f);
                }
                catch( Exception exception )
                {
                }
            };
            var plus5Button = new Button{ Text = "+5" };
            plus5Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 5f);
                }
                catch( Exception exception )
                {
                }
            };
            var plus3Button = new Button{ Text = "+3" };
            plus3Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 3f);
                }
                catch( Exception exception )
                {
                }
            };
            var plus1Button = new Button{ Text = "+1" };
            plus1Button.Clicked += delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;
                    totalDeLaComidaEntry.Text = "" + ( totalDeLaComida + 1f);
                }
                catch( Exception exception )
                {
                }
            };

            var cambiarMonedaButton = new Button{ Text = "MXN" };

            cambiarMonedaButton.Clicked += async delegate(object sender, EventArgs e){
                try
                {
                    float totalDeLaComida =  float.Parse( totalDeLaComidaEntry.Text ) ;

                    indicator.IsVisible = true;
                    indicator.IsRunning = true;
                    var from = "USD";
                    var to = "MXN";
                    if( cambiarMonedaButton.Text.Equals("MXN"))
                    {
                        from = "USD";
                        to = "MXN";
                    }
                    else
                    {
                        from = "MXN";
                        to = "USD";
                    }
                    HttpResponse<string> response = await Unirest.get("https://currency-exchange.p.mashape.com/exchange?from="+from+"&q="+totalDeLaComida+"&"+to+"=MXN")
                        .header("X-Mashape-Key", "xUnaD3PLmhmshJQmfF35NhFUZUOSp1vJXQtjsnrTrGSsoxOBad")
                        .header("Accept", "text/plain")
                        .asStringAsync();
                    indicator.IsRunning = false;
                    indicator.IsVisible = false;
                    totalDeLaComidaEntry.Text = response.Body;
                    if( cambiarMonedaButton.Text.Equals("MXN"))
                    {
                        cambiarMonedaButton.Text = "USD";
                    }
                    else
                    {
                        cambiarMonedaButton.Text = "MXN";
                    }
                    //MainPage.DisplayAlert ("Calculado", "Cambio:" +response.Body , "OK");
                }
                catch( Exception exception )
                {
                }
            };
            var porcentajeDePropinaEntry =
                new Entry {
                Text = "10"
            };
            var porcentajeDePropinaSlider =
                new Slider(0,100,10) ;

            porcentajeDePropinaSlider.ValueChanged += delegate(object sender, ValueChangedEventArgs e) {
                porcentajeDePropinaEntry.Text = "" + e.NewValue;
            };
            var CalcularPropinaButton = new Button {
                Text = "Calcular propina",
                FontSize = Device.GetNamedSize (NamedSize.Large, typeof(Label)),
                FontAttributes = FontAttributes.Bold
            };

            MainPage = new ContentPage {
                Content =
                    new ContentView{
                    Padding = 40,
                        Content =
                        new StackLayout {
                        VerticalOptions = LayoutOptions.Center,
                        Children = {
                            new Label {
                                XAlign = TextAlignment.Center,
                                Text = "Numero de personas",
                                FontSize = Device.GetNamedSize (NamedSize.Large, typeof(Label)),
                                FontAttributes = FontAttributes.Bold
                            },
                            new StackLayout {
                                Orientation = StackOrientation.Horizontal,
                                Padding = 20,
                                Children ={
                                    set3Button,
                                    set4Button,
                                    set5Button,
                                    set6Button,
                                    set7Button,
                                    set8Button
                                }
                            },
                            new StackLayout {
                                Orientation = StackOrientation.Horizontal,
                                Padding = 20,
                                Children ={
                                    numeroDePersonasStepper,

                                }
                            },
                            numeroDePersonasEntry,
                            new Label {
                                XAlign = TextAlignment.Center,
                                Text = "Total de la comida ( $ )",
                                FontSize = Device.GetNamedSize (NamedSize.Large, typeof(Label)),
                                FontAttributes = FontAttributes.Bold
                            },
                            new StackLayout {
                                Orientation = StackOrientation.Horizontal,
                                Padding = 20,
                                Children ={
                                    new StackLayout {
                                        Orientation = StackOrientation.Vertical,
                                        Padding = 20,
                                        Children ={
                                            plus500Button,
                                            plus300Button,
                                            plus100Button,
                                        }
                                    },
                                    new StackLayout {
                                        Orientation = StackOrientation.Vertical,
                                        Padding = 20,
                                        Children ={
                                            plus50Button,
                                            plus30Button,
                                            plus10Button,
                                        }
                                    },
                                    new StackLayout {
                                        Orientation = StackOrientation.Vertical,
                                        Padding = 20,
                                        Children ={
                                            plus5Button,
                                            plus3Button,
                                            plus1Button,
                                        }
                                    },
                                }
                            },
                            new StackLayout {
                                Orientation = StackOrientation.Horizontal,
                                Padding = 20,
                                Children ={
                                    totalDeLaComidaEntry,
                                    indicator,
                                    cambiarMonedaButton}
                            },
                            new Label {
                                XAlign = TextAlignment.Center,
                                Text = "Porcentaje de propina ( % )",
                                FontSize = Device.GetNamedSize (NamedSize.Large, typeof(Label)),
                                FontAttributes = FontAttributes.Bold
                            },
                            porcentajeDePropinaSlider,
                            porcentajeDePropinaEntry,
                            CalcularPropinaButton
                        }
                    }
                }
            };

            CalcularPropinaButton.Clicked +=   delegate(object sender, EventArgs e) {
                try
                {
                    int numeroDePersonas =  Int32.Parse( numeroDePersonasEntry.Text ) ;
                    float totalDeLaComida = float.Parse( totalDeLaComidaEntry.Text );
                    float porcentajeDePropina = float.Parse( porcentajeDePropinaEntry.Text );
                    float propinaPorPersona = ( totalDeLaComida / (float)numeroDePersonas ) * (porcentajeDePropina / 100f);
                    MainPage.DisplayAlert ("Calculado", "Propina por persona:" + propinaPorPersona , "OK");
                }
                catch(Exception exception)
                {
                    MainPage.DisplayAlert ("Erro", "Favor de revisar los campos" , "OK");
                }
            };
        }
        public async Task ExecuteLoadTweetsCommand()
        {
            if (IsBusy)
                return;

            IsBusy = true;
            LoadTweetsCommand.ChangeCanExecute();
            var error = false;
            try
            {

                Tweets.Clear();
                var auth = new ApplicationOnlyAuthorizer()
                {
                    CredentialStore = new InMemoryCredentialStore
                    {
                        ConsumerKey = "ZTmEODUCChOhLXO4lnUCEbH2I",
                        ConsumerSecret = "Y8z2Wouc5ckFb1a0wjUDT9KAI6DUat5tFNdmIkPLl8T4Nyaa2J",
                    },
                };
                await auth.AuthorizeAsync();

                var twitterContext = new TwitterContext(auth);

                var queryResponse = await
                  (from tweet in twitterContext.Status
                   where tweet.Type == StatusType.User &&
                     tweet.ScreenName == "shanselman" &&
                     tweet.Count == 100 &&
                     tweet.IncludeRetweets == true &&
                     tweet.ExcludeReplies == true
                   select tweet).ToListAsync();

                var tweets =
                  (from tweet in queryResponse
                   select new Tweet
                   {
                       StatusID = tweet.StatusID,
                       ScreenName = tweet.User.ScreenNameResponse,
                       Text = tweet.Text,
                       CurrentUserRetweet = tweet.CurrentUserRetweet,
                       CreatedAt = tweet.CreatedAt,
                       Image = tweet.RetweetedStatus != null && tweet.RetweetedStatus.User != null ?
                                      tweet.RetweetedStatus.User.ProfileImageUrl.Replace("http://", "https://") : (tweet.User.ScreenNameResponse == "shanselman" ? "scott159.png" : tweet.User.ProfileImageUrl.Replace("http://", "https://"))
                   }).ToList();
                foreach (var tweet in tweets)
                {
                    Tweets.Add(tweet);
                }

                if (Device.OS == TargetPlatform.iOS)
                {
                    // only does anything on iOS, for the Watch
                    DependencyService.Get<ITweetStore>().Save(tweets);
                }



            }
            catch
            {
                error = true;
            }

            if (error)
            {
                var page = new ContentPage();
                await page.DisplayAlert("Error", "Unable to load tweets.", "OK");
            }

            IsBusy = false;
            LoadTweetsCommand.ChangeCanExecute();
        }