Accessing Phonebook, Location, Camera Telerik School Academy Xamarin apps for iOS, Android & WinPhone.

Device APIs with Xamarin

Accessing Phonebook, Location, Camera

http://schoolacademy.telerik.com

Telerik School Academyhttp://schoolacademy.telerik.com

Xamarin apps for iOS, Android & WinPhone

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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

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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();}

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

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

Geolocation Implementation

Add device implementation and use Dependency

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[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) }); }}

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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

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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);} }

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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();}

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

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

Camera Android (1) Add device implementation and use

Dependency

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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

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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());

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Device APIs with Xamarin

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