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Takuji Nishibayashi
April 12, 2019
Technology
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Kotlin Inline Class
Takuji Nishibayashi
April 12, 2019
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Transcript
KotlinͷInline classΛAndroidΞϓϦ Ͱ׆༻͢Δ @takuji31 Mobile Act OSAKA #9
ࣗݾհ
ࣗݾհ • @takuji31 id:takuji31 • Takuji Nishibayashi • Hatena Co.,
Ltd. • App Team • ίϛοΫDAYS • δϟϯϓϧʔΩʔʂ • ΧΫϤϜ
ࣗݾհ • Android • Kotlin • Flu-er • ! h-ps:/
/blog.takuji31.jp • " h-ps:/ /nazuna.takuji31.jp • # $ h-ps:/ /photo.takuji31.jp
ಥવͰ͕࣭͢Ͱ͢
AndroidΞϓϦ ։ൃͯ͠·͔͢ʁ
Kotlin ͬͯ·͢ΑͶʁ
͍·͢ΑͶʁ
ಛผͳҙຯΛ࣋ͭ ϓϦϛςΟϒܕͷ ͋Γ·͢ΑͶʁ
ྫ͑
ID
࣌
URLͷςϯϓϨʔτ
APIͰड͚औͬͨΓ
ը໘ͷύϥϝʔλʔʹͨ͠Γ
ྫ͑ID͕શ෦Stringͩͱ Α͔͘Βͳ͍
͏͔ͬΓϢʔβʔͷID͖͢ͱ͜ Ζʹ ผͷIDΛͯ͠͠·͏
ܕͰͳΜͱ͔͍ͨ͠
Inline class
Inline class • ࡞Γํ • APIͷϨεϙϯεͰ • ը໘ͷύϥϝʔλʔͱͯ͠
࡞Γํ
Inline class UserId( val value: String // single value only
)
؆୯Ͱ͢Ͷ
APIͷϨεϙϯεͰ
{ "id": "1234567890", "name": "takuji31", "iconUrlTemplate": "https://takuji31.jp/icon.png?size={size}", "lastLoggedInAt": "2019-04-09T01:23:45+09:00", "birthday":
"1987-03-01" }
No Inline classes data class User( val id: String, val
name: String, val iconUrlTemplate: String, val lastLoggedInAt: String, val birthday: String )
With Inline classes data class User( val id: UserId, val
name: String, val iconUrlTemplate: UrlTemplate, val lastLoggedInAt: DateTimeString, val birthday: DateString )
Parse͢Δ
kotlinx.serializa.on
Not supported
Gson
JavaͷReflec(onͰ ݩͷܕͱͯ͠ೝࣝ͞ΕΔ →Կ͠ͳͯ͘Α͍
Moshi
Reflec%on
Not supported
Codegen
objectͱͯ͠ೝࣝ͠Α͏ͱ͢Δ→ࢮ
AdapterΛ࡞Δ
ࣗಈੜͰ͖Δͱ͍͍͔ʁ
APIͷϨεϙϯεͰ • ఆٛ؆୯ • ͏ͷ؆୯ • γϦΞϥΠζ͢Δ࣌πʔϧΛબͼͦ͏ • Gson •
Moshi Codegen + Կ͔ͰAdapterੜ
ը໘ͷύϥϝʔλʔͱͯ͠
Jetpack Naviga-on Safe Args
<fragment android:id="@+id/user" android:name="jp.takuji31.inline.UserFragment" > <argument android:name="id" app:argType="jp.takuji31.inline.UserId" /> </fragment>
ͦͷ··ͩͱSafe ArgsʹInline class ͕ͤͳ͍
Serializableʹ͢Δ
inline class UserId(val value: String) : Serializable
fun openUserScreen(user: User) { findNavController() .navigate( R.id.action_home_to_user, UserFragmentArgs(user.id).toBundle() ) }
private val args: UserFragmentArgs by navArgs() override fun oncreate(savedInstanceState: Bundle?)
{ super.onCreate(savedInstanceState) val userId = args.id // do something }
h"ps:/ /github.com/takuji31/inline- class-example
ExperimentalͳͷͰ ͝ར༻ܭըతʹ
data classͰ༻͢Δͷ ͝ݕ౼͍ͩ͘͞
enjoy Inline class life
! ࠾༻ใ
גࣜձࣾͯͳͰɺ ͱʹʮઓʯͰ͖Δ ؒΛืू͍ͯ͠·͢
͜ΜͳਓΛ୳͍ͯ͠·͢ • AndroidΞϓϦΛ࡞Γ͍ͨਓ • iOSΞϓϦΛ࡞Γ͍ͨਓ • ͋Δ͍྆ํ • ͳΜͳΒαʔόʔαΠυ
h"ps:/ /hatenacorp.jp/recruit/