Kotlin Inline Class

Transcript

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

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2. ࣗݾ঺հ
   

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

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4. ࣗ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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5. ಥવͰ͕࣭͢໰Ͱ͢
   

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6. AndroidΞϓϦ
   ։ൃͯ͠·͔͢ʁ
   

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7. Kotlin
   ࢖ͬͯ·͢ΑͶʁ
   

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8. ࢖͍·͢ΑͶʁ
   

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9. ಛผͳҙຯΛ࣋ͭ
   ϓϦϛςΟϒܕͷ஋
   ͋Γ·͢ΑͶʁ
   

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10. ྫ͑͹
    

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11. ID
    

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12. ೔෇
    

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13. ೔࣌
    

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14. URLͷςϯϓϨʔτ
    

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15. APIͰड͚औͬͨΓ
    

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16. ը໘ͷύϥϝʔλʔʹͨ͠Γ
    

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17. ྫ͑͹ID͕શ෦Stringͩͱ
    Α͘෼͔Βͳ͍
    

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18. ͏͔ͬΓϢʔβʔͷID౉͢΂͖ͱ͜
    Ζʹ
    ผͷIDΛ౉ͯ͠͠·͏
    

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19. ܕͰͳΜͱ͔͍ͨ͠
    

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20. Inline class
    

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21. Inline class
    • ࡞Γํ
    • APIͷϨεϙϯεͰ
    • ը໘ͷύϥϝʔλʔͱͯ͠
    

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22. ࡞Γํ
    

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

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24. ؆୯Ͱ͢Ͷ
    

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25. APIͷϨεϙϯεͰ
    

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26. {
    "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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27. 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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28. 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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29. Parse͢Δ
    

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30. kotlinx.serializa.on
    

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31. Not supported
    

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32. Gson
    

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33. JavaͷReflec(onͰ͸
    ݩͷܕͱͯ͠ೝࣝ͞ΕΔ
    →Կ΋͠ͳͯ͘Α͍
    

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34. Moshi
    

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35. Reflec%on
    

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36. Not supported
    

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37. Codegen
    

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38. objectͱͯ͠ೝࣝ͠Α͏ͱ͢Δ→ࢮ
    

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39. AdapterΛ࡞Δ
    

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40. ࣗಈੜ੒Ͱ͖Δͱ͍͍͔΋ʁ
    

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

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42. ը໘ͷύϥϝʔλʔͱͯ͠
    

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43. Jetpack Naviga-on
    Safe Args
    

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44. android:id="@+id/user"
    android:name="jp.takuji31.inline.UserFragment" >
    android:name="id"
    app:argType="jp.takuji31.inline.UserId" />
    
    

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45. ͦͷ··ͩͱSafe ArgsʹInline class
    ͕౉ͤͳ͍
    

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46. Serializableʹ͢Δ
    

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47. inline class UserId(val value: String) : Serializable
    

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

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

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

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51. ExperimentalͳͷͰ
    ͝ར༻͸ܭըతʹ
    

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52. data classͰ୅༻͢Δͷ΋
    ͝ݕ౼͍ͩ͘͞
    

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53. enjoy Inline class life
    

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54. !
    ࠾༻৘ใ
    

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55. גࣜձࣾ͸ͯͳͰ͸ɺ
    ͱ΋ʹʮ௅ઓʯͰ͖Δ
    ஥ؒΛืू͍ͯ͠·͢
    

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

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

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