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

2. http://github.com/mayuki
3. Android TV AgqrPlayer for Android TV Xamarin Kotlin
5. TV Android #10ft=3m … Android==
6. UI https://www.google.com/design/spec-tv/ Recommendation
7. Design Pattern: Browse Lane
8. Design Pattern: Detail View
9. Design Pattern: Wizard
22. Android ( )
23. adb shell & logcat
25. A&G+
27. http://agqr.jp/
30. presents 17:00 30 YouTube https://www.youtube.com/playlist?list=PLAJedE0KWalQUzGD354wuweVYEdJxqwTg
31. A&G+
36. JetBrains JVM Better Java Java IntelliJ(Android Studio) IDE
37. AgqrPlayer for Android TV Xamarin Kotlin
38. ( )
40. Kotlin null Primary Constructor if, when Delegation override by default Type Erasure Lazy
41. C# Java null
42. class Greeter(val message: String) { private val prefix = "Hello!" fun hello() { println("$prefix $message") } } class Program { fun main() { Greeter("Konnichiwa!").hello() // => Konnichiwa! } }
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. C# class NanikaData(val valueA: String, val valueB: Int) { } NanikaData("Hoge", 1).valueA // => Hoge
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. 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. 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. 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. 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. Delegated Proeprties
53. Kotlin Kotlin JVM 1
54. IDE
55. No LINQPad & No ConsoleApplication REPL&Playground
56. is hard
57. Xamarin
58. C#
60. Android TV A&G+ Kotlin C#