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Xamarin概要と活⽤⽅法
2017/10/7(⼟) いま注⽬のMicrosoft最新テク
ノロジーをキャッチアップ ~ Azure、Cognitive
Services、Xamarin ~ @ Java Küche
Japan Xamari...
営業(セールスエンジニア) 兼 新規事業開発室 室⻑
Xamarin コミュニティエバンジェリスト
Microsoft MVP Visual Studio and Development Technologies
Xamarin MVP
コミュ...
アジェンダ
事例
Xamarin 概要
共通化のしくみ
Demo 振り返り
まとめ
Xamarin でどんなアプリが作れるの?
フェンリル株式会社 様
http://biz.fenrir-
inc.com/application_dev
elopment/casestudy_ap
p/nhk_kouhaku.html
NHK 紅⽩
5
@muak_x さん
http://kamusoft.hatenab
log.jp/entry/2016/11/08/
220810
6
⾊しらべ
@yamamo さん
https://docs.com
/yamamoto-
takahiro/9893/jxu
gc-17-xamarin
7
AzureVM Power Switch
https://www.xamarin.com/prebuilt
Prebuilt サンプル
8
Acquaint Sport Xamarin CRM My Shoppe
Demo
9
Xamarin とは
C#/.NET/Visual Studio
フル “ネイティブ” アプリ
API 100% 移植
コード共通化
11
Xamarin
C#
12
button.Click += async (sender, e) =>
{
var client = new HttpClient();
using (var reader = new StreamReader(await cli...
2つの開発⼿法
13
Shared C# App Logic
(PCL)
Shared XAML/C# UI Code
(Xamarin.Forms)
iOS
C# UI
Shared C# App Logic
(PCL)
Android
C#...
必要な知識
プラットフォーム
個別
Xamarin Native
iOS API Objective-C, Swift Xcode
Android API Java Android Studio
Windows API Visual Studi...
UIは個別
ネイティブAPIは個別
PCL or Shared
ネットワーク
Json, XML
永続化
async/await
15
Xamarin ネイティブ
iOS
C# UI
Shared C# App Logic
(PCL)
Andr...
Xamarin ネイティブ
16
抽象化UIライブラリ
最⼤公約数
ワンソース・ネイティブUI/UX
XAML / MVVM
拡張可能
17
Xamarin.Forms
Shared C# App Logic
(PCL)
Shared XAML/C# UI Code
(Xama...
Pages
18
Layouts
19
Controls
ActivityIndicator BoxView Button DatePicker Editor
Entry Image Label ListView Map
OpenGLView Picker ProgressBar S...
Xamarin.Forms
ワンソース
ネイティブの
UI/UX
XAML
MVVM
21
XAML
22
Header と Footer
シンプルな ImageCell を使⽤
23
例) ListView
24
<ListView ItemsSource="{Binding Items}" CachingStrategy="RecycleElement" HasUnevenRows="true"
IsPullToRefreshEnabled="t...
共通化の仕組み
PCL vs Shared
#if __ANDROID__
#if __IOS__
26
Windows
AndroidiOS
.NET Standard = PCL の上位互換
ポータブル クラス ライブラリとの⽐較
Xamarin.Forms の .NET Standard 対応
Share More Code with .NET Standard 2.0 | Xa...
.NET Standard | Microsoft Docs
主に技術⽇記: .NET Standard のおさらい
さいきんの.NETのこととかNuGetとかCoreとかよく分からないよ
ねーって話 - Qiita
Xamarin.Forms...
C#er/XAMLer/WPF/UWP → Forms
iOS/Android ネイティブ経験者 → ネイティブ
素早く簡単に作る → Forms
きれいに細かく作る → ネイティブ
社内プロジェクト → Forms
受託開発 → ??
HTM...
Demo 振り返り
30
Cognitive Services
31
「cognitive」で検索
Cognitive Services
のSDK有無
@201707 -
BEACHSIDE BLOG
32
Azure Portal
33
private async Task<OcrResults> DoOcrAsync(Stream imageStream, string language)
{
// Vision APIのService clientを作成
var vi...
34
public static async Task<string> DoOcrAsync(Stream imageStream, string lang)
{
using (var client = new HttpClient())
{
...
分析
テキストの読み取り
⼿書き⽂字の読み取
り(プレビュー)
著名⼈およびランド
マークの認識
ほぼリアルタイムでビ
デオを分析
サムネイルの⽣成
35
Computer Vision API
60 以上の⾔語のテキ
スト間での翻訳
⾃動的に⾔語を検
出
独⾃翻訳システムを
構築
36
Translator API
POST
https://southeastasia.api.cognitive.m
icrosoft.com/vision/v1.0/ocr
Header
Ocp-Apim-Subscription-Key
Content-Type
Cont...
Token
https://api.cognitive.microsoft.com/
sts/v1.0/issueToken
Ocp-Apim-Subscription-Key から
Token
GET
appid
text
from
to
c...
まとめ
C# だけで iOS/Android アプリを開発できる
Xamarin.Forms ではデスクトップアプリのように
Xamarin.iOS/Xamarin.Android でしっかりと
ネイティブ API はゆっくり覚えれば良い
Xamari...
Xamarin をやってみたくなったら
Mac
Apple Developer Program への加⼊
勉強を楽しむ⼼
必要なもの
Visual Studio 2017 なら、インストールするだけ!
http://ytabuchi.hatenablog.com/entry/visualstudio2017
Android SDK をちゃんとインストール
Intel HAXM...
Android SDK/各バージョンのSDK Platform
44
Xamarin 逆引き Tips - Build Insider
Xamarin に関する投稿 - Qiita
Xamarin Advent Calendar
YouTube の JXUG チャンネル
Insider.NET > .NET TI...
プログラミング Xamarin 上巻
Xamarin ネイティブによるモバイルアプリ開発
Essential Xamarin
基礎から学ぶ Xamarinプログラミング
かずきのXamarin.Forms⼊⾨
46
書籍
Xamarin ハンズオン (初級)
Xamarin.Android ListView ハンズオン (初級)
Xamarin Dev Days Tokyo ハンズオン (中級)
Xamarin&Microsoft Cognitive Servi...
Teratail
Facebook の JXUG グループ
Twitter (#Xamarin #JXUG タグで呟く)
48
聞く
読む・⾒る・聞く・調べる
Guides - Xamarin (ドキュメント)
Recipes - Xamarin (逆引き辞典)
Xamarin Blog
Xamarin channel - Youtube (セッション動画)
Xamarin ...
ありがとうございます。
ぜひ触ってみてください!
⽥淵義⼈@エクセルソフト
Twitter: @ytabuchi
Facebook: ytabuchi.xlsoft
080-7015-3586
50
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Xamarin概要と活用方法

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Xamarin概要と活用方法

  1. 1. Xamarin概要と活⽤⽅法 2017/10/7(⼟) いま注⽬のMicrosoft最新テク ノロジーをキャッチアップ ~ Azure、Cognitive Services、Xamarin ~ @ Java Küche Japan Xamarin User Group ⽥淵義⼈@エクセルソフト
  2. 2. 営業(セールスエンジニア) 兼 新規事業開発室 室⻑ Xamarin コミュニティエバンジェリスト Microsoft MVP Visual Studio and Development Technologies Xamarin MVP コミュニティ Japan Xamarin User Group 主宰 Twitter: @ytabuchi Facebook: ytabuchi.xlsoft Blog: Xamarin ⽇本語情報 2 ⽥淵義⼈@エクセルソフト
  3. 3. アジェンダ 事例 Xamarin 概要 共通化のしくみ Demo 振り返り まとめ
  4. 4. Xamarin でどんなアプリが作れるの?
  5. 5. フェンリル株式会社 様 http://biz.fenrir- inc.com/application_dev elopment/casestudy_ap p/nhk_kouhaku.html NHK 紅⽩ 5
  6. 6. @muak_x さん http://kamusoft.hatenab log.jp/entry/2016/11/08/ 220810 6 ⾊しらべ
  7. 7. @yamamo さん https://docs.com /yamamoto- takahiro/9893/jxu gc-17-xamarin 7 AzureVM Power Switch
  8. 8. https://www.xamarin.com/prebuilt Prebuilt サンプル 8 Acquaint Sport Xamarin CRM My Shoppe
  9. 9. Demo 9
  10. 10. Xamarin とは
  11. 11. C#/.NET/Visual Studio フル “ネイティブ” アプリ API 100% 移植 コード共通化 11 Xamarin
  12. 12. C# 12 button.Click += async (sender, e) => { var client = new HttpClient(); using (var reader = new StreamReader(await client.GetStreamAsync("xxx"))) { var deserializer = new XmlSerializer(typeof(Rss)); var latest = deserializer.Deserialize(reader) as Rss; var feed = latest.Channel.Items .Where(x => x.Link.Contains("xamarin")) .Select(x => x.Title).ToList(); } };
  13. 13. 2つの開発⼿法 13 Shared C# App Logic (PCL) Shared XAML/C# UI Code (Xamarin.Forms) iOS C# UI Shared C# App Logic (PCL) Android C# UI Windows C# UI Xamarin.FormsXamarin Native ロジックのみ共通化 UIはネイティブで個別に作りこむ
  14. 14. 必要な知識 プラットフォーム 個別 Xamarin Native iOS API Objective-C, Swift Xcode Android API Java Android Studio Windows API Visual StudioC# API ⾔語 統合開発環境 iOS API Objective-C, Swift Xcode Android API Java Android Studio Windows API Visual StudioC# Xamarin.Forms iOS API Android API Windows API Objective-C, Swift Xcode Java Android Studio Visual StudioC#Xamarin.Forms UI toolkit 14
  15. 15. UIは個別 ネイティブAPIは個別 PCL or Shared ネットワーク Json, XML 永続化 async/await 15 Xamarin ネイティブ iOS C# UI Shared C# App Logic (PCL) Android C# UI Windows C# UI Xamarin Native ロジックのみ共通化 UIはネイティブで個別に作りこむ
  16. 16. Xamarin ネイティブ 16
  17. 17. 抽象化UIライブラリ 最⼤公約数 ワンソース・ネイティブUI/UX XAML / MVVM 拡張可能 17 Xamarin.Forms Shared C# App Logic (PCL) Shared XAML/C# UI Code (Xamarin.Forms) Xamarin.Forms
  18. 18. Pages 18
  19. 19. Layouts 19
  20. 20. Controls ActivityIndicator BoxView Button DatePicker Editor Entry Image Label ListView Map OpenGLView Picker ProgressBar SearchBar Slider Stepper TableView TimePicker WebView EntryCell ImageCell SwitchCell TextCell ViewCell 20 Switch
  21. 21. Xamarin.Forms ワンソース ネイティブの UI/UX XAML MVVM 21
  22. 22. XAML 22
  23. 23. Header と Footer シンプルな ImageCell を使⽤ 23 例) ListView
  24. 24. 24 <ListView ItemsSource="{Binding Items}" CachingStrategy="RecycleElement" HasUnevenRows="true" IsPullToRefreshEnabled="true" IsRefreshing="{Binding IsBusy, Mode=OneWay}" RefreshCommand="{Binding RefreshDataCommand}"> <!--Header--> <ListView.Header> <StackLayout Padding="10" BackgroundColor="#dadada" HorizontalOptions="FillAndExpand" Orientation="Horizontal"> <Label FontAttributes="Bold" HorizontalOptions="FillAndExpand" HorizontalTextAlignment="Center" Text="Header" TextColor="Black" /> </StackLayout> </ListView.Header> <!--Built in Cells--> <ListView.ItemTemplate> <DataTemplate> <ImageCell Detail="{Binding Detail}" ImageSource="{Binding ImageUrl}" Text="{Binding Text}" /> </DataTemplate> </ListView.ItemTemplate> <!--Footer--> <ListView.Footer> <StackLayout Padding="10" BackgroundColor="#dadada" HorizontalOptions="FillAndExpand" Orientation="Horizontal"> <Label FontAttributes="Bold" HorizontalOptions="FillAndExpand" HorizontalTextAlignment="Center" Text="Footer" TextColor="Black" /> </StackLayout> </ListView.Footer> </ListView>
  25. 25. 共通化の仕組み
  26. 26. PCL vs Shared #if __ANDROID__ #if __IOS__ 26 Windows AndroidiOS
  27. 27. .NET Standard = PCL の上位互換 ポータブル クラス ライブラリとの⽐較 Xamarin.Forms の .NET Standard 対応 Share More Code with .NET Standard 2.0 | Xamarin Blog Xamarin.Forms Stable Comes to .NET Standard 2.0 | Xamarin Blog .NET Standard/PCL/Shared Library 27
  28. 28. .NET Standard | Microsoft Docs 主に技術⽇記: .NET Standard のおさらい さいきんの.NETのこととかNuGetとかCoreとかよく分からないよ ねーって話 - Qiita Xamarin.Forms+.NET Standard 1.6を試す – Takashi Kawasaki – Medium .NET Standard 28
  29. 29. C#er/XAMLer/WPF/UWP → Forms iOS/Android ネイティブ経験者 → ネイティブ 素早く簡単に作る → Forms きれいに細かく作る → ネイティブ 社内プロジェクト → Forms 受託開発 → ?? HTML/JS → Cordova? React Native? 29 Xamarin.Forms vs Xamarin ネイティブ
  30. 30. Demo 振り返り 30
  31. 31. Cognitive Services 31
  32. 32. 「cognitive」で検索 Cognitive Services のSDK有無 @201707 - BEACHSIDE BLOG 32 Azure Portal
  33. 33. 33 private async Task<OcrResults> DoOcrAsync(Stream imageStream, string language) { // Vision APIのService clientを作成 var visionServiceClient = new VisionServiceClient( Secrets.ComputerVisionApiKey, "https://southeastasia.api.cognitive.microsoft.com/vision/v1.0"); // イメージストリームをアップロードしてOCRを実⾏ var ocrResult = await visionServiceClient.RecognizeTextAsync( imageStream, language); return ocrResult; } SDK
  34. 34. 34 public static async Task<string> DoOcrAsync(Stream imageStream, string lang) { using (var client = new HttpClient()) { // ヘッダーとパラメーターを付与したリクエストを作成 client.DefaultRequestHeaders.Add( "Ocp-Apim-Subscription-Key", Secrets.ComputerVisionApiKey); var sendUri = $"{uriBase}?language={lang}&detectOrientation=true"; // StreamをコンテントとしてPOSTする var content = new StreamContent(imageStream); content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); var response = await client.PostAsync(sendUri, content); // JSONを取得してデシリアライズ string contentString = await response.Content.ReadAsStringAsync(); var ocrResultString = JsonConvert.DeserializeObject<OcrResult>(contentString); } } REST
  35. 35. 分析 テキストの読み取り ⼿書き⽂字の読み取 り(プレビュー) 著名⼈およびランド マークの認識 ほぼリアルタイムでビ デオを分析 サムネイルの⽣成 35 Computer Vision API
  36. 36. 60 以上の⾔語のテキ スト間での翻訳 ⾃動的に⾔語を検 出 独⾃翻訳システムを 構築 36 Translator API
  37. 37. POST https://southeastasia.api.cognitive.m icrosoft.com/vision/v1.0/ocr Header Ocp-Apim-Subscription-Key Content-Type Content application/json multipart/form-data application/octet-stream 37 REST API
  38. 38. Token https://api.cognitive.microsoft.com/ sts/v1.0/issueToken Ocp-Apim-Subscription-Key から Token GET appid text from to category 38 REST API
  39. 39. まとめ
  40. 40. C# だけで iOS/Android アプリを開発できる Xamarin.Forms ではデスクトップアプリのように Xamarin.iOS/Xamarin.Android でしっかりと ネイティブ API はゆっくり覚えれば良い Xamarin は楽しい 40
  41. 41. Xamarin をやってみたくなったら
  42. 42. Mac Apple Developer Program への加⼊ 勉強を楽しむ⼼ 必要なもの
  43. 43. Visual Studio 2017 なら、インストールするだけ! http://ytabuchi.hatenablog.com/entry/visualstudio2017 Android SDK をちゃんとインストール Intel HAXM の x86 Emulator を使⽤する 丁寧に環境構築 43
  44. 44. Android SDK/各バージョンのSDK Platform 44
  45. 45. Xamarin 逆引き Tips - Build Insider Xamarin に関する投稿 - Qiita Xamarin Advent Calendar YouTube の JXUG チャンネル Insider.NET > .NET TIPS - @IT JXUG : 関連ページ、ブログ⼀覧 Xamarin ⽇本語ドキュメントの紹介 : XLsoft エクセルソフト 45 ⽇本語情報
  46. 46. プログラミング Xamarin 上巻 Xamarin ネイティブによるモバイルアプリ開発 Essential Xamarin 基礎から学ぶ Xamarinプログラミング かずきのXamarin.Forms⼊⾨ 46 書籍
  47. 47. Xamarin ハンズオン (初級) Xamarin.Android ListView ハンズオン (初級) Xamarin Dev Days Tokyo ハンズオン (中級) Xamarin&Microsoft Cognitive Services ハンズオン (中級) Xamarin.Forms CustomRenderer ハンズオン (中級) Xamarin.Forms&Prism.Forms、Moq ハンズオン (上級) JXUG で主催しているハンズオンやもくもく会に参加 http://jxug.connpass.com 47 ⼿を動かす
  48. 48. Teratail Facebook の JXUG グループ Twitter (#Xamarin #JXUG タグで呟く) 48 聞く
  49. 49. 読む・⾒る・聞く・調べる Guides - Xamarin (ドキュメント) Recipes - Xamarin (逆引き辞典) Xamarin Blog Xamarin channel - Youtube (セッション動画) Xamarin Forums Stackoverflow Prebuilt アプリ 49 英語情報
  50. 50. ありがとうございます。 ぜひ触ってみてください! ⽥淵義⼈@エクセルソフト Twitter: @ytabuchi Facebook: ytabuchi.xlsoft 080-7015-3586 50

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