拡張版

HelloCamera.cs

using System;
using Plugin.Media;
using Xamarin.Forms;

namespace HelloCamera
{
	public class App : Application
	{
		Image photoImage;

		public App()
		{
			photoImage = new Image
			{
			};
			var button = new Button
			{
				Text = "写真撮影する"
			};
			var albumButton = new Button
			{
				Text = "アルバムから選択"
			};

			// The root page of your application
			var content = new ContentPage
			{
				Title = "HelloCamera",
				Content = new StackLayout
				{
					VerticalOptions = LayoutOptions.Center,
					Children = {
						new Label {
							HorizontalTextAlignment = TextAlignment.Center,
							Text = "写真撮影サンプル"
						},
						button,
						albumButton,
						photoImage
					}
				}
			};

			albumButton.Clicked += async (sender, e) =>
			{
				// 写真撮影の処理を入れる
				await CrossMedia.Current.Initialize();

				if (!CrossMedia.Current.IsPickPhotoSupported)
				{
					await content.DisplayAlert(
						"警告",
						"アルバムにアクセスできません",
						"OK");
				}

				var file = await CrossMedia.Current.PickPhotoAsync(
					new Plugin.Media.Abstractions.PickMediaOptions
					{						
						PhotoSize = Plugin.Media.Abstractions.PhotoSize.Custom,
						CustomPhotoSize = 50,						
					});

				// 
				if (file == null) return;
				//
				photoImage.Source = ImageSource.FromStream(() =>
				{
					var stream = file.GetStream();
					file.Dispose();
					return stream;
				});
				
			};

			button.Clicked += async (sender, e) =>
			{
				// 写真撮影の処理を入れる
				await CrossMedia.Current.Initialize();

				if (!CrossMedia.Current.IsCameraAvailable
					|| !CrossMedia.Current.IsTakePhotoSupported)
				{
					await content.DisplayAlert(
						"警告",
						"カメラデバイスが使えません",
						"OK");
					return;
				}


				var file = await CrossMedia.Current.TakePhotoAsync(
					new Plugin.Media.Abstractions.StoreCameraMediaOptions
					{
						Directory = "Photos",
						Name = "sample.jpg",
						PhotoSize = Plugin.Media.Abstractions.PhotoSize.Custom,
						CustomPhotoSize = 20,
						DefaultCamera =
						Plugin.Media.Abstractions.CameraDevice.Rear
					});
				// 
				if (file == null) return;
				//
				photoImage.Source = ImageSource.FromStream(() =>
				{
					var stream = file.GetStream();
					file.Dispose();
					return stream;
				});

			};
			MainPage = new NavigationPage(content);
		}

		protected override void OnStart()
		{
			// Handle when your app starts
		}

		protected override void OnSleep()
		{
			// Handle when your app sleeps
		}

		protected override void OnResume()
		{
			// Handle when your app resumes
		}
	}
}