Android TVとXamarinとKotlin

Transcript

1. 1.

   None
2. 2.

   http://github.com/mayuki

3. 3.

   Android TV AgqrPlayer for Android TV Xamarin Kotlin

4. 4.

   None
5. 5.

   TV Android #10ft=3m … Android==

6. 6.

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

7. 7.

   Design Pattern: Browse Lane

8. 8.

   Design Pattern: Detail View

9. 9.

   Design Pattern: Wizard

10. 10.

    None
11. 11.

    None
12. 12.

    None
13. 13.

    None
14. 14.

    None
15. 15.

    None
16. 16.

    None
17. 17.

    None
18. 18.

    None
19. 19.

    None
20. 20.

    None
21. 21.

    None
22. 22.

    Android ( )

23. 23.

    adb shell & logcat

24. 24.

    None
25. 25.

    A&G+

26. 26.

    None
27. 27.

    http://agqr.jp/

28. 28.

    None
29. 29.

    None
30. 30.

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

31. 31.

    A&G+

32. 32.

    None
33. 33.

    None
34. 34.

    None
35. 35.

    None
36. 36.

    JetBrains JVM Better Java Java IntelliJ(Android Studio) IDE

37. 37.

    AgqrPlayer for Android TV Xamarin Kotlin

38. 38.

    ( )

39. 39.

    None
40. 40.

    Kotlin null Primary Constructor if, when Delegation override by default

    Type Erasure Lazy
41. 41.

    C# Java null

42. 42.

    class Greeter(val message: String) { private val prefix = "Hello!"

    fun hello() { println("$prefix $message") } } class Program { fun main() { Greeter("Konnichiwa!").hello() // => Konnichiwa! } }
43. 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
44. 44.

    C# class NanikaData(val valueA: String, val valueB: Int) { }

    NanikaData("Hoge", 1).valueA // => Hoge
45. 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) }
46. 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 }
47. 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)
48. 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
49. 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 } }
50. 50.

    Delegated Proeprties

51. 51.

    None
52. 52.

    None
53. 53.

    Kotlin Kotlin JVM 1

54. 54.

    IDE

55. 55.

    No LINQPad & No ConsoleApplication REPL&Playground

56. 56.

    is hard

57. 57.

    Xamarin

58. 58.

    C#

59. 59.

    None
60. 60.

    Android TV A&G+ Kotlin C#