The document contains code snippets from different platforms showing login functionality: - An Android code snippet shows a button click handler starting a new activity - An iOS code snippet connects a button to login logic - A Xamarin.Forms code snippet defines a login page with an image, label, entry and button laid out in a stack layout

8. button.Click += async (sender, e) =>
{
var client = new HttpClient();
using (var reader = new StreamReader(await client.GetStreamAsync("xxx")))
{
var deserializer = new XmlSerializer(typeof(Rss));
var latest = deserializer.Deserialize(reader) as Rss;
var feed = latest.Channel.Items
.Where(x => x.Link.Contains("xamarin"))
.Select(x => x.Title).ToList();
}
};

12. [Register ("TodoListViewController")]
partial class TodoListViewController
{
[Outlet]
[GeneratedCode ("iOS Designer", "1.0")]
UIButton LoginButton { get; set; }
...
}
LoginButton.TouchUpInside += (object sender,
EventArgs e) => {
// TODO: add logic here
}
ViewController.designer.cs
ViewController.cs

16. public class MainActivity : Activity
{
...
void OnClick(object sender, EventArgs e)
{
var intent = new Intent(this, typeof(Activity2));
base.StartActivity(intent);
}
}

25. <?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="App1.Views.XamlPage"
...
Title="Login Page">
<StackLayout Padding="8" Spacing="4">
<Image Source="/Images/Xamagon.png"
HeightRequest="300"
WidthRequest="300" />
<Label FontSize="Large"
Text="Xamarin.Forms Login Page" />
<Entry x:Name="entry"
Text="{Binding Name}" />
<Button x:Name="loginButton"
Clicked="LoginButton_Clicked"
Text="Login" />
</StackLayout>
</ContentPage>
public class CSharpPage : ContentPage
{
public CSharpPage()
{
var image = new Image { ... };
var label = new Label {... };
var entry = new Entry { ... };
var loginButton = new Button {... };
loginButton.Clicked += LoginButton_Clicked;
Title = "Login Page";
Content = new StackLayout
{
Children =
{
image,
label,
entry,
loginButton
},
};
}
}