This document contains summaries of various Xamarin components and libraries that can be used to build cross-platform mobile apps. It includes summaries of components for radial progress, JSON parsing, barcode scanning, Dropbox integration, encrypted SQLite storage, Azure mobile backend, charts, social sharing, signature capture, location services, and more. The document also includes code samples for using many of these components.

1. James Clancey
Senior Mobile Developer
Xamarin
clancey@xamarin.com
Must-use App
Components
@jtclancey

2. Component Store with IDE Integration

3. Radial Progress
• Stylish animated progress view

4. Radial Progress
• Stylish animated progress view
• Same API on iOS, Android

5. Radial Progress
• Stylish animated progress view
• Same API on iOS, Android
• Perfect for background tasks

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Radial Progress Sample Usage
using RadialProgress;
public override void ViewDidLoad()
{
base.ViewDidLoad();
! !
var progressView = new RadialProgressView {
Center = new PointF (View.Center.X, View.Center.Y - 100)
};
View.AddSubview (progressView);
// Update the progress
progressView.Value = 0.46f;
}

7. Json.NET
• LINQ-to-JSON for custom JSON parsing and output

8. Json.NET
• LINQ-to-JSON for custom JSON parsing and output
• Faster than .NET's built-in JSON serializers

9. Json.NET
• LINQ-to-JSON for custom JSON parsing and output
• Faster than .NET's built-in JSON serializers
• Also converts JSON to and from XML

10. Json.net
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public class Person
{
public string Name { get; set; }
public DateTime Birthday { get; set; }
}
public Person ParsePerson (string jsonString)
{
var person = JsonConvert.DeserializeObject<Person>(jsonString);
return person;
}

11. ZXing.Net.Mobile is a C#/.NET Barcode Scanning Library
ZXing.Net.Mobile

12. ZXing.Net.Mobile
• Open Source
• Simple API
• Cross platform
iOS
Android
Windows Phone
• Custom Overlays

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ZXing.Net.Mobile
public void Scan ()
{
! var scanner = new ZXing.Mobile.MobileBarcodeScanner ();
! scanner.Scan ().ContinueWith (t => {
! ! if (t.Result != null)
! ! ! Console.WriteLine ("Scanned Barcode: " + t.Result.Text);
! } );
!
}

14. Dropbox
• API handles all the caching, retrying, and file change
notifications.

15. Dropbox
• API handles all the caching, retrying, and file change
notifications.
• Writes are local so changes are immediate. The Sync API syncs
to Dropbox behind the scenes.

16. Dropbox
• API handles all the caching, retrying, and file change
notifications.
• Writes are local so changes are immediate. The Sync API syncs
to Dropbox behind the scenes.
• Your app works great even when offline and automatically syncs
when it's back online.

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Dropbox Sync
void ListFiles (string path)
{
! ! DBError error;
! ! var contents = DBFilesystem.SharedFilesystem.ListFolder (path, out error);
! ! foreach (DBFileInfo info in contents) {
! ! ! Console.WriteLine (info.Path);
! ! }
}

18. • By Zetetic LLC
• 256-bit AES encryption of SQLite database files
SQLCipher

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SQLCipher
public class Model
{
! [PrimaryKey,AutoIncrement]
! public int Id { get; set; }
! public string Content { get; set; }
}
using(var conn = new SQLiteConnection (FilePath, Password))
{
! var model = conn.Table<Model>().Where(x=> x.Id = 0)
}

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SQLCipher
public void SqlCipherDemo ()
{
! using (var connection = new
Mono.Data.Sqlcipher.SqliteConnection(connectionString)) {
! ! connection.SetPassword ("secretPassword");
! ! connection.Open ();
! ! using (var command = connection.CreateCommand()) {
! ! ! var query = "select * from t1";
! ! ! command.CommandText = query;
! ! ! var reader = command.ExecuteReader ();
! ! ! while (reader.Read()) {
! ! ! ! //Read Values
! ! ! }
! ! }
! ! connection.Close ();
! }
}

21. Mobile Services by Windows Azure
• By Microso"
• Easily store data in the cloud
• Managed C#
• Cross Platform
iOS
Android
Windows
• Async

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Mobile Services by Windows Azure
public class Item
{
! ! public int Id { get; set; }
! ! public string Text { get; set; }
}
Item item = new Item { Text = "Awesome item" };
! ! ! App.MobileService.GetTable<Item> ().InsertAsync (item)
! ! ! ! .ContinueWith (t => {
! ! ! /* success or failure */
} );

23. by Shinobi
Blazing fast charts!
ShinobiCharts

24. Xamarin.Social
• Cross Platform
iOS
Android
• Share Text or Images
• Twitter
• Facebook
• Flickr
• App.net
• Pinterest

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Xamarin.Social
// 1. Create the service
var facebook = new FacebookService {
! ClientId = "<App ID from developers.facebook.com/apps>",
! RedirectUrl = new System.Uri ("<Redirect URL from
developers.facebook.com/apps>")
};
// 2. Create an item to share
var item = new Item { Text = "Xamarin.Social is the bomb.com." };
item.Links.Add (new Uri ("http://github.com/xamarin/xamarin.social"));
// 3. Present the UI on iOS
var shareController = facebook.GetShareUI (item, result => {
! // result lets you know if the user shared the item or canceled
! DismissViewController (true, null);
});
PresentViewController (shareController, true, null);

26. Signature Pad
• Very simple API
• Save/Load Vectors
• Export Image

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Signature Pad
var signature = new SignaturePadView (View.Frame);
View.AddSubview (signature);
//Get the signature
var image = signature.GetImage ();
ViewController (shareController, true, null);

28. Xamarin.Mobile
• Cross platform
iOS
Android
Windows
• GeoLocation
• Contacts
• Media Picker

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Xamarin.Mobile
var locator = new Geolocator { DesiredAccuracy = 50 };
locator.GetPositionAsync (timeout: 10000).ContinueWith (t => {
! Console.WriteLine ("Position Status: {0}", t.Result.Timestamp);
! Console.WriteLine ("Position Latitude: {0}", t.Result.Latitude);
! Console.WriteLine ("Position Longitude: {0}", t.Result.Longitude);
}, TaskScheduler.FromCurrentSynchronizationContext ());

30. Q&A

31. DEMO

32. THANK YOU
James Clancey
clancey@xamarin.com
@jtclancey