Kotlin Inline Class

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/