KotlinでRetrofitを使いやすくするちょっとした工夫

2016/02/26 Kotlin Birthday Party #jkug

Transcript

1. KotlinͰRetrofitΛ
   ࢖͍΍͘͢͢Δ
   ͪΐͬͱͨ͠޻෉
   2015/02/26
   Shinya Kumagai(@droibit)
   

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2. About Me
   • Shinya Kumagai (۽୩ ৻໵) 25ࡀ
   • Twitter, GitHub - @droibit
   • λΦιϑτ΢ΣΞגࣜձࣾ
   

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3. Happy Birthday Kotlin!!
   (ɾ8ɾ)
   

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4. ֓ཁ
   • connpass API ༻ͷRetrofit ServiceΛର৅
   - JavaͰఆٛ͞ΕͨService
   - KotlinͰServiceΛఆٛ
   KotlinͰ࢖͏ͱ͖ͷͪΐͬͱͨ͠޻෉
   IUUQTRVBSFHJUIVCJPSFUSPpU
   

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5. Connpass API
   • ݕࡧΫΤϦ
   - keyword … Ωʔϫʔυ
   - order … ݁Ռͷදࣔॱ (1:ߋ৽ॱ, 2…)
   - ymd … Πϕϯτ։࠵೔ (yyyymmdd)
   • Ϩεϙϯε͸JSON
   ?keyword=kotlin&order=1&ymd=20150226
   IUUQDPOOQBTTDPNBCPVUBQJ
   

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6. JavaͰఆٛ͞ΕͨService
   public interface ConnpassService {
   // ※ @Get, @Query ͸লུ
   Response searchEvent(@NonNull String keyword,
   @Nullable Integer order,
   @Nullable String ymd);
   }
   // શΫΤϦΛࢦఆ
   service.searchEvent(“kotlin”, 1, "20160226");
   // ΩʔϫʔυͷΈͷ৔߹
   service.searchEvent("kotlin", null, null);
   

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7. // ֦ுؔ਺Λఆٛ + σϑΥϧτҾ਺
   fun ConnpassService.searchEventExt(
   keyword: String,
   order: Order? = null,
   ymd: String? = null
   ) = searchEvent(keyword, order?.index, ymd)
   // ݕࡧ݁Ռͷදࣔॱͷྻڍମ
   enum class Order(val index: Int) {
   UPDATE(1), EVENT(2), NEW(3);
   override fun toString() = "$index"
   }
   // ΩʔϫʔυҎ֎͸ඞཁͳΫΤϦͷΈ
   service.searchEventExt("kotlin", order = Order.UPDATE)
   KotlinͰվળ
   

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8. KotlinͰServiceΛఆٛ
   interface ConnpassService {
   // ※ @Get,@Query ͸লུ
   fun searchEvent(keyword: String,
   order: Order? = null,
   ymd: String? = null): Response
   }
   // ΩʔϫʔυҎ֎͸ඞཁͳΫΤϦͷΈ
   service.searchEvent(“kotlin”, order = Order.UPDATE)
   

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9. // ༻్ʹ߹Θ֦ͤͨுؔ਺Λఆٛ
   fun ConnpassService.searchEvent(
   keyword: String,
   order: Order? = null,
   ymd: Date? = null
   ) = searchEvent(keyword, order, format(ymd))
   // DateΛ yyyymmdd ϑΥʔϚοτͷStringʹม׵
   fun format(date: Date?): String? = …
   // ։࠵೔ʹ͸DateΦϒδΣΫτΛࢦఆ
   service.searchEvent(“kotlin",
   ymd = dateFromTimesSquare)
   վળྫ
   

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10. ·ͱΊ
    • ൚༻తͳΠϯλʔϑΣʔεʹͳΔ͹͍͋͸ɺ
    σϑΥϧτҾ਺ɺ֦ுؔ਺Ͱγϯϓϧͳ
    Service΁
    fabricͷΑ͏ʹ͸ͳΒͳ͍Α͏ʹؾΛ͚ͭ·͠ΐ͏
    

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11. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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