This document discusses developing Android apps using C# and Xamarin Studio. It introduces Xamarin Studio, an IDE for building apps for Android, iOS and Mac. It describes Xamarin.Android architecture which allows C# code to run on Android via the Mono runtime alongside the Dalvik VM. It also covers layout design, activity code, and includes a demo of creating a sample calculator app in Xamarin Studio.

1. Android App
Development with C#.Net
(using Xamarin Studio)
Vasistan Shakkaravarthi

2. In this module
• About Xamarin Studio.
• Xamarin.Android architecture
• Xamarin Studio IDE
• Nice to know
• Sample app: Layout design
• Sample app: Activity code
• Sample app creation demo.
Android App Development using Xamarin Studio 2

3. Xamarin Studio
Build better apps for iOS, Android and Mac with Xamarin Studio.
Android App Development using Xamarin Studio 3

4. Xamarin.Android Architecture
Android App Development using Xamarin Studio 4
Xamarin.Android applications run within the Mono
execution environment. This execution environment
runs side-by-side with the Dalvik Virtual Machine. Both
runtime environments run on top of the Linux kernel
and expose various APIs to the user code that allows
developers to access the underlying system. Both
Mono and Dalvik are runtimes written in the C
language.

5. Xamarin Studio IDE
Android App Development using Xamarin Studio 5

6. Xamarin Studio IDE
Android App Development using Xamarin Studio 6

7. Nice to know
• Layouts
• Activity
• Resources
• C# features (generic class, delegate etc.)
Android App Development using Xamarin Studio 7

8. Layout Design
Android App Development using Xamarin Studio 8
TextView control
EditText control
Button control

9. Activity Code
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;
namespace SampleApp
{
[Activity (Label = "Sample", MainLauncher=true)]
public class CalcActivity : Activity
{
protected override void OnCreate (Bundle bundle)
{
base.OnCreate (bundle);
SetContentView (Resource.Layout.CalcForm);
Button button = FindViewById<Button> (Resource.Id.button1);
button.Click += delegate {
EditText txt1 = FindViewById<EditText> (Resource.Id.editText1);
EditText txt2 = FindViewById<EditText> (Resource.Id.editText2);
TextView tvResult = FindViewById<TextView> (Resource.Id.textView4);
tvResult.Text= (int.Parse( txt1.Text.Trim()) + int.Parse( txt2.Text.Trim())).ToString();
};
}
}
}
Android App Development using Xamarin Studio 9

10. Demo
Android App Development using Xamarin Studio 10

11. Reference
• http://developer.xamarin.com/guides/android/under_the_hood/archi
tecture/
• https://xamarin.com/studio
• http://developer.xamarin.com/
Android App Development using Xamarin Studio 11

12. Thank you
Check the other resources
Blog
http://vasistan.blogspot.in
YouTube
http://www.youtube.com/playlist?list=PL-CcORxeaUcgXHO7UW9sGNbue9wH-4No3