Kotlin Inline Class

Transcript

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

2. ࣗݾ঺հ

3. ࣗݾ঺հ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co.,

   Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ

4. ࣗݾ঺հ • Android • Kotlin • Flu-er • ! h-ps:/

   /blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp

5. ಥવͰ͕࣭͢໰Ͱ͢

6. AndroidΞϓϦ ։ൃͯ͠·͔͢ʁ

7. Kotlin ࢖ͬͯ·͢ΑͶʁ

8. ࢖͍·͢ΑͶʁ

9. ಛผͳҙຯΛ࣋ͭ ϓϦϛςΟϒܕͷ஋ ͋Γ·͢ΑͶʁ

10. ྫ͑͹

11. ID

12. ೔෇

13. ೔࣌

14. URLͷςϯϓϨʔτ

15. APIͰड͚औͬͨΓ

16. ը໘ͷύϥϝʔλʔʹͨ͠Γ

17. ྫ͑͹ID͕શ෦Stringͩͱ Α͘෼͔Βͳ͍

18. ͏͔ͬΓϢʔβʔͷID౉͢΂͖ͱ͜ Ζʹ ผͷIDΛ౉ͯ͠͠·͏

19. ܕͰͳΜͱ͔͍ͨ͠

20. Inline class

21. Inline class • ࡞Γํ • APIͷϨεϙϯεͰ • ը໘ͷύϥϝʔλʔͱͯ͠

22. ࡞Γํ

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

    )

24. ؆୯Ͱ͢Ͷ

25. APIͷϨεϙϯεͰ

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" }

27. No Inline classes data class User( val id: String, val

    name: String, val iconUrlTemplate: String, val lastLoggedInAt: String, val birthday: String )

28. With Inline classes data class User( val id: UserId, val

    name: String, val iconUrlTemplate: UrlTemplate, val lastLoggedInAt: DateTimeString, val birthday: DateString )

29. Parse͢Δ

30. kotlinx.serializa.on

31. Not supported

32. Gson

33. JavaͷReflec(onͰ͸ ݩͷܕͱͯ͠ೝࣝ͞ΕΔ →Կ΋͠ͳͯ͘Α͍

34. Moshi

35. Reflec%on

36. Not supported

37. Codegen

38. objectͱͯ͠ೝࣝ͠Α͏ͱ͢Δ→ࢮ

39. AdapterΛ࡞Δ

40. ࣗಈੜ੒Ͱ͖Δͱ͍͍͔΋ʁ

41. APIͷϨεϙϯεͰ • ఆٛ͸؆୯ • ࢖͏ͷ΋؆୯ • γϦΞϥΠζ͢Δ࣌͸πʔϧΛબͼͦ͏ • Gson •

    Moshi Codegen + Կ͔ͰAdapterੜ੒

42. ը໘ͷύϥϝʔλʔͱͯ͠

43. Jetpack Naviga-on Safe Args

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

45. ͦͷ··ͩͱSafe ArgsʹInline class ͕౉ͤͳ͍

46. Serializableʹ͢Δ

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

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

49. private val args: UserFragmentArgs by navArgs() override fun oncreate(savedInstanceState: Bundle?)

    { super.onCreate(savedInstanceState) val userId = args.id // do something }

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

51. ExperimentalͳͷͰ ͝ར༻͸ܭըతʹ

52. data classͰ୅༻͢Δͷ΋ ͝ݕ౼͍ͩ͘͞

53. enjoy Inline class life

54. ! ࠾༻৘ใ

55. גࣜձࣾ͸ͯͳͰ͸ɺ ͱ΋ʹʮ௅ઓʯͰ͖Δ ஥ؒΛืू͍ͯ͠·͢

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

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