Device APIs with Xamarin

Accessing Phonebook, Location, Camera

http://schoolacademy.telerik.com

Telerik School Academyhttp://schoolacademy.telerik.com

Xamarin apps for iOS, Android & WinPhone

2

Table of Contents

1. Reference Xamarin.Mobile

2. Accessing Device APIs Geo location

Address book

Camera

Xamarin.Mobile Download Xamarin.Mobile or install through Components for each platform

3

4

Table of Contents

1. Reference Xamarin.Mobile

2. Accessing Device APIs

Geo location Address book

Camera

Geolocation Shared Code

Add interface IGeolocator

Use DependencyServices to call methods

Use MessageingCenter to Subscribe to event

Public interface IGeolocator { void GetPosition();}

5

IGeolocator locator = DependencyService .Get<IGeolocator>(); locator.GetPosition();

MessagingCenter.Subscribe<IGeolocator, AppPosition>(this, [matching string], DisplayPosition);

Geolocation Implementation

Add device implementation and use Dependency

6

[assembly: Dependency (typeof (Geolocator_Android))]public class Geolocator_Android : Action, IGeolocator { public GeoLocation GetPosition () { var locator = new Geolocator(Forms.Context) { DesiredAccuracy = 50 }; if (locator.IsListening != true) { locator.StartListening( minTime: 1000, minDistance: 0); } var pos = await locator.GetPositionAsync( timeout: 20000); MessagingCenter.Send<IGeolocator, AppPosition>( this, "gotLocation", new AppPosition( pos.Latitude, pos.Longitude) }); }}

7

Table of Contents

1. Reference Xamarin.Mobile

2. Accessing Device APIs Geo location

Address book Camera

Address Book Shared Code

Add interface IContactsGetter

Use DependencyServices to call methods

Use MessageingCenter to Subscribe to event

8

Public interface IContactsGetter { void GetPhonebook();}

IContactsGetter contactsGetter = DependencyService .Get<IContactsGetter>(); contactsGetter.GetPhonebook();

MessagingCenter .Subscribe<IContactsGetter, IEnumerable<AppContact>> (this, [matching string], DisplayContacts);

Address Book Implementation

Add device implementation and use Dependencypublic async void GetPhonebook() { var book = new AddressBook(Forms.Context); var hasAccess = await book.RequestPermission();

if (hasAccess) { List<AppContact> contacts = new List<AppContact>(); foreach (var c in book) { contacts.Add(new AppContact() { Name = c.DisplayName, Number = c.Phones.FirstOrDefault().Number }); } MessagingCenter .Send<IContactsGetter,IEnumerable<AppContact>> (this, "gotContacts", contacts);} }

9

10

Table of Contents

1. Reference Xamarin.Mobile

2. Accessing Device APIs Geo location

Address book

Camera

Camera Shared Code Add interface ITakePhoto

Add assembly Dependency

Public interface ITakePhoto { void TakePhoto();}

11

IPhotoTaker picker = DependencyService .Get<IPhotoTaker>();picker.TakePhoto();

MessagingCenter .Subscribe<IPhotoTaker, string>( this, "photoTaken", PathPhotoTaken);

Camera Android (1) Add device implementation and use

Dependency

12

public async void TakePhoto() { var picker = new MediaPicker(Forms.Context); var intent = picker.GetTakePhotoUI(new StoreCameraMediaOptions { DefaultCamera = CameraDevice.Rear, Directory = "DemoFolder", Name = "myPic.jpg" });

StartActivityForResult(intent, 1);}

Camera Android (2) Override OnActivityResult

13

protected async override void OnActivityResult( int requestCode, Result resultCode, Intent data){ if (resultCode == Result.Canceled) return;

var mediaFile = await data .GetMediaFileExtraAsync(Forms.Context);

MessagingCenter.Send<IPhotoTaker, string>( this, "photoTaken", mediaFile.Path);}

Camera iOS Add interface and use the

Xamarin.DependencyServices

using Xamarin.Media;// ...

var picker = new MediaPicker();picker .PickPhotoAsync() .ContinueWith (t => { MediaFile file = t.Result; Console.WriteLine (file.Path);}, TaskScheduler.FromCurrentSynchronizationContext());

14

форум програмиране, форум уеб дизайнкурсове и уроци по програмиране, уеб дизайн – безплатно

програмиране за деца – безплатни курсове и уроцибезплатен SEO курс - оптимизация за търсачки

уроци по уеб дизайн, HTML, CSS, JavaScript, Photoshop

уроци по програмиране и уеб дизайн за ученициASP.NET MVC курс – HTML, SQL, C#, .NET, ASP.NET MVC

безплатен курс "Разработка на софтуер в cloud среда"

BG Coder - онлайн състезателна система - online judge

курсове и уроци по програмиране, книги – безплатно от Наков

безплатен курс "Качествен програмен код"

алго академия – състезателно програмиране, състезания

ASP.NET курс - уеб програмиране, бази данни, C#, .NET, ASP.NETкурсове и уроци по програмиране – Телерик академия

курс мобилни приложения с iPhone, Android, WP7, PhoneGap

free C# book, безплатна книга C#, книга Java, книга C#Дончо Минков - сайт за програмиранеНиколай Костов - блог за програмиранеC# курс, програмиране, безплатно

?

? ? ??

?? ?

?

?

?

??

?

?

? ?

Questions?

?

Device APIs with Xamarin

http://academy.telerik.com

Free Trainings @ Telerik Academy

C# Programming @ Telerik Academy csharpfundamentals.telerik.com

Telerik Software Academy academy.telerik.com

Telerik Academy @ Facebook facebook.com/TelerikAcademy

Telerik Software Academy Forums forums.academy.telerik.com