Additional Topics

API Bindings

Bindings Binding Native API’s Create Binding Project Drop Jar or.a Done

You wish! Painful

Bindings Android Generate C# stubs from Java Classes Simple Jar’s work without issues XML transforms for differences in C# / Java: – Anonymous inner classes – Data Type Mapping – Enums Samples available Did I say it’s painful already?

Bindings iOS Have to define all Classes / Methods manually ObjectiveSharpie command line tool – Great help – Still a lot of manual work linkwith.cs file requires manual adaption – C Libraries – iOS Frameworks Errors appear when linking

Let’s have a look Urban Airship binding (MyWorldVision)

Bindings Conclusion Many API’s are already available, maintained by main developer (Facebook, Microsoft etc.) Try to avoid bindings if other Components / Packages are available (-> e.g. Parse) Read error messages Use Xamarin Forums, Stackoverflow Be patient!

SQLite Crossplattform DB

Data Model public class TodoItem { public TodoItem () { } [PrimaryKey, AutoIncrement] public int ID { get; set; } public string Name { get; set; } public string Notes { get; set; } public bool Done { get; set; } }

Get Connection (Dependency Service) public interface ISQLite { SQLiteConnection GetConnection(); }

Android Implementation public SQLite.SQLiteConnection GetConnection () { var sqliteFilename = "TodoSQLite.db3"; string documentsPath = System.Environment.GetFolderPath (System.Environment.SpecialFolder.Personal); // Documents folder var path = Path.Combine(documentsPath, sqliteFilename); // Create the connection var conn = new SQLite.SQLiteConnection(path); // Return the database connection return conn; }}

Usage Init: database = DependencyService.Get ().Get Connection (); database.CreateTable (); SQL Query: return database.Query ("SELECT * FROM [TodoItem] WHERE [Done] = 0");

Usage LINQ Expressions: TodoItem GetItem (int id){ return database.Table ().FirstOrDefault ( x => x.ID == id); } return database.Delete (id);

Let’s have a look SQLite Demo App

JSON.Net Jason!

Decisions, decisions System.Json vs Json.Net -> Use Json.Net unless you have a good reason -> Less restrictive

Basic example var todoItem = new TodoItem { ID = 1, Name = "Name” }; var json = JsonConvert.SerializeObject (todoItem); Debug.WriteLine ("JSON representation of todoItem: {0}", json); var person2 = JsonConvert.DeserializeObject (json); Debug.WriteLine ("{0} - {1}", person2.ID, person2.Name);

Linq example string jsontext Name: 'Bob', HairColor: 'Brown' }"; var bob = JObject.Parse (jsontext); Debug.WriteLine ("{0} with {1} hair", bob["Name"], bob["HairColor"]);

Let’s have a quick look JSON Example

UI Tests Testcloud

TestCloud Physical devices mounted in Rack

UI Test For all native Apps Physical devices mounted in Rack Run locally in Simulator (iOS, Android) Deploy to Cloud for mass testing 60 Device Minutes included More is a bit expensive

UI Test – how it works iOS: e.NativeView.AccessibilityIdentifier = value; Android: e.NativeView.ContentDescription = value; [Test] public void WelcomeTextIsDisplayed () { AppResult[] results = app.WaitForElement (c => c.Marked ("Welcome to Xamarin Forms!")); app.Screenshot ("Welcome screen."); Assert.IsTrue (results.Any ()); }

Tests Let’s have a look (Local App)

Tests Let’s have a look (testcloud.xamarin.com)

Insights Analytics & Crash Reports made easy

Usage Import Package Register API Key Done

Hold your horses… Uncaught Exceptions get reported automatically Exception Reporting for caught exceptions: Insights.Report(ex); User Identification Events Timed Events

Insights platform/insights/application/ platform/insights/application/