Android TVとXamarinとKotlin

CLR/H in Tokyo (2017/01/21)

https://www.google.com/design/spec-tv/
http://agqr.jp/
https://www.youtube.com/playlist?list=PLAJedE0KWalQUzGD354wuweVYEdJxqwTg

Transcript

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2. http://github.com/mayuki
   

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3. Android TV
   AgqrPlayer for Android TV
   Xamarin Kotlin
   

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5. TV Android
   #10ft=3m …
   Android==
   

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6. UI
   https://www.google.com/design/spec-tv/
   Recommendation
   

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7. Design Pattern: Browse Lane
   

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8. Design Pattern: Detail View
   

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9. Design Pattern: Wizard
   

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22. Android
    ( )
    

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23. adb shell & logcat
    

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25. A&G+
    

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27. http://agqr.jp/
    

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30. presents
    17:00 30
    YouTube
    https://www.youtube.com/playlist?list=PLAJedE0KWalQUzGD354wuweVYEdJxqwTg
    

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31. A&G+
    

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36. JetBrains JVM
    Better Java
    Java
    IntelliJ(Android Studio) IDE
    

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37. AgqrPlayer for Android TV Xamarin Kotlin
    

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38. ( )
    

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40. Kotlin
    null
    Primary Constructor
    if, when
    Delegation
    override by default
    Type Erasure
    Lazy
    

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41. C# Java
    null
    

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42. class Greeter(val message: String) {
    private val prefix = "Hello!"
    fun hello() {
    println("$prefix $message")
    }
    }
    class Program {
    fun main() {
    Greeter("Konnichiwa!").hello() // => Konnichiwa!
    }
    }
    

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43. // 再代入不可 (プロパティも同じ)
    val valueA = "Hello"
    valueA = "Konnichiwa!" // Compile Error: Val cannot reassigned
    var valueB = "Hello"
    valueB = "Konnichiwa!" // OK
    // null許容
    var valueNullable: String? = "Hogehoge"
    valueNullable = null
    // null非許容
    var valueNonNullable = "Mogemoge"
    valueNonNullable = null // Error: Null can not be a value of a non-null
    type String
    

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44. C#
    class NanikaData(val valueA: String, val valueB: Int) {
    }
    NanikaData("Hoge", 1).valueA // => Hoge
    

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45. (0..10)
    // ラムダ式のデフォルト引数 it
    .map({ it * 2 })
    // カッコ不要
    .filter { it > 5 }
    // 引数に名前を付ける
    .forEach { i -> println(i) }
    

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46. val value = NantokaType.ARIENAI
    // when, if
    val message = when (value) {
    NantokaType.SUGOI -> "Sugoi"
    NantokaType.YABAI -> "Yabai"
    else -> "Majikayo"
    }
    println(message) // => "Majikayo"
    enum class NantokaType {
    SUGOI, YABAI, ARIENAI
    }
    

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47. var valueA: String? = "nantoka"
    // この時点では null かもしれないので ?. または !! が必要
    valueA?.substring(0, 3)
    if (valueA == null) { return }
    // ここに来れば null ではないと判断され null-safe/non-null
    assert 不要
    valueA.substring(0, 3)
    

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48. val valueB: Any = "Nantoka" // Any == Object
    if (valueB is String) {
    valueB.substring(0, 3) // 値が String だと判断できる
    }
    valueB.substring // Compile Errorで呼べない
    TypeScript
    

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49. interface BaseA { fun hoge() }
    interface BaseB { fun moge() }
    class BaseAImpl : BaseA {
    override fun hoge() = println(“BaseA”)
    }
    class BaseBImpl : BaseB {
    override fun moge() = println(“BaseB”)
    }
    class AAndBImpl(b: BaseB) : BaseA by BaseAImpl(), BaseB by b {
    // BaseAの実装BaseAImpl, BaseBはb
    // mix-in
    }
    class NantokaKantoka {
    fun methodA() {
    AAndBImpl(BaseBImpl()).hoge() // => BaseA
    AAndBImpl(BaseBImpl()).moge() // => BaseB
    }
    }
    

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50. Delegated Proeprties
    

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53. Kotlin
    Kotlin JVM 1
    

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54. IDE
    

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55. No LINQPad & No ConsoleApplication
    REPL&Playground
    

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56. is hard
    

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57. Xamarin
    

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58. C#
    

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60. Android TV
    A&G+
    Kotlin
    C#
    

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