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KotlinͷInline classΛAndroidΞϓϦ Ͱ׆༻͢Δ @takuji31 Mobile Act OSAKA #9

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ࣗݾ঺հ

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ࣗݾ঺հ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co., Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ

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ࣗݾ঺հ • Android • Kotlin • Flu-er • ! h-ps:/ /blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp

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ಥવͰ͕࣭͢໰Ͱ͢

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AndroidΞϓϦ ։ൃͯ͠·͔͢ʁ

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Kotlin ࢖ͬͯ·͢ΑͶʁ

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࢖͍·͢ΑͶʁ

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ಛผͳҙຯΛ࣋ͭ ϓϦϛςΟϒܕͷ஋ ͋Γ·͢ΑͶʁ

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ྫ͑͹

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ID

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೔෇

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೔࣌

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URLͷςϯϓϨʔτ

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APIͰड͚औͬͨΓ

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ը໘ͷύϥϝʔλʔʹͨ͠Γ

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ྫ͑͹ID͕શ෦Stringͩͱ Α͘෼͔Βͳ͍

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͏͔ͬΓϢʔβʔͷID౉͢΂͖ͱ͜ Ζʹ ผͷIDΛ౉ͯ͠͠·͏

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ܕͰͳΜͱ͔͍ͨ͠

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Inline class

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Inline class • ࡞Γํ • APIͷϨεϙϯεͰ • ը໘ͷύϥϝʔλʔͱͯ͠

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࡞Γํ

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Inline class UserId( val value: String // single value only )

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؆୯Ͱ͢Ͷ

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APIͷϨεϙϯεͰ

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{ "id": "1234567890", "name": "takuji31", "iconUrlTemplate": "https://takuji31.jp/icon.png?size={size}", "lastLoggedInAt": "2019-04-09T01:23:45+09:00", "birthday": "1987-03-01" }

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No Inline classes data class User( val id: String, val name: String, val iconUrlTemplate: String, val lastLoggedInAt: String, val birthday: String )

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With Inline classes data class User( val id: UserId, val name: String, val iconUrlTemplate: UrlTemplate, val lastLoggedInAt: DateTimeString, val birthday: DateString )

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Parse͢Δ

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kotlinx.serializa.on

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Not supported

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Gson

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JavaͷReflec(onͰ͸ ݩͷܕͱͯ͠ೝࣝ͞ΕΔ →Կ΋͠ͳͯ͘Α͍

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Moshi

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Reflec%on

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Not supported

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Codegen

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objectͱͯ͠ೝࣝ͠Α͏ͱ͢Δ→ࢮ

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AdapterΛ࡞Δ

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ࣗಈੜ੒Ͱ͖Δͱ͍͍͔΋ʁ

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APIͷϨεϙϯεͰ • ఆٛ͸؆୯ • ࢖͏ͷ΋؆୯ • γϦΞϥΠζ͢Δ࣌͸πʔϧΛબͼͦ͏ • Gson • Moshi Codegen + Կ͔ͰAdapterੜ੒

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ը໘ͷύϥϝʔλʔͱͯ͠

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Jetpack Naviga-on Safe Args

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ͦͷ··ͩͱSafe ArgsʹInline class ͕౉ͤͳ͍

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Serializableʹ͢Δ

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inline class UserId(val value: String) : Serializable

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fun openUserScreen(user: User) { findNavController() .navigate( R.id.action_home_to_user, UserFragmentArgs(user.id).toBundle() ) }

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private val args: UserFragmentArgs by navArgs() override fun oncreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) val userId = args.id // do something }

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h"ps:/ /github.com/takuji31/inline- class-example

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ExperimentalͳͷͰ ͝ར༻͸ܭըతʹ

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data classͰ୅༻͢Δͷ΋ ͝ݕ౼͍ͩ͘͞

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enjoy Inline class life

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! ࠾༻৘ใ

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גࣜձࣾ͸ͯͳͰ͸ɺ ͱ΋ʹʮ௅ઓʯͰ͖Δ ஥ؒΛืू͍ͯ͠·͢

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͜ΜͳਓΛ୳͍ͯ͠·͢ • AndroidΞϓϦΛ࡞Γ͍ͨਓ • iOSΞϓϦΛ࡞Γ͍ͨਓ • ͋Δ͍͸྆ํ • ͳΜͳΒαʔόʔαΠυ΋

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h"ps:/ /hatenacorp.jp/recruit/