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Kotlin AndroidΞϓϦ ։ൃࣄྫ঺հ(ٕज़ฤ) 2016/09/07 ΪϧυΧϯϑΝϨϯε2016
 Abe Asami

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ࣗݾ঺հ "CF"TBNJl͖ͷࢠz
 େࡕͷϑϦʔϥϯεϓϩάϥϚ IUUQOPDPOPOFU !BBUI 4DBMBɺ"OEPSJE +BWB,PUMJO

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w ౔ େࡕ࢈ۀ૑଄ؗʹͯ։࠵ʂ IUUQTVNNJUTDBMBLBOTBJPSH

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ຊ೔ͷ಺༰ • ۩ମతͳίʔυྫΛݩʹɺઌ೔ͷAndroid։ ൃҊ݅Ͱར༻ͨ͠Kotlinͷػೳ΍AndroidϥΠ ϒϥϦͷ঺հ͍͖ͯ͠·͢ɻ • λΠτϧʹ ɹϚʔΫ͕͋ΔεϥΠυ͸ KotlinɺɹɹϚʔΫ͕͋ΔεϥΠυ͸Android ϥΠϒϥϦͷ࿩Ͱ͢ɻ

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Kotlin࠾༻ʹ͋ͨΓ ·ͣߦͬͨ͜ͱ

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৘ใऩू

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৘ใऩूͷ݁Ռ ࣄલʹܾΊͨ͜ͱ • kapt(Annotation ProcessingΛ࢖༻͢ΔͨΊͷϥΠ ϒϥϦ)Λ࢖༻͠ͳ͍ • ෆ۩߹͕ଟ͘ϋϚΓ΍͍͢ͱฉ͍ͨͨΊ • KotlinͰDagger2Λར༻͢ΔࡍʹඞཁʹͳΔ • ར༻͍ͯ͠Δͱ͍͏࿩΋Α͘ฉ͘ͷͰɺ࣍͸νϟϨ ϯδͯ͠Έ͍ͨ

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ϓϩδΣΫτͷߏ੒ • ϓϨθϯ૚ • Activity΍FragmentɺCustomView (UI෦඼) • υϝΠϯ૚ • ϏδωεϩδοΫɺEntity (ΞϓϦଆ༻) • Πϯϑϥ૚ • API΍DB΁ͷσʔλΞΫηεɺEntity (API༻) ※ ࠓճॾࣄ৘ʹΑΓɺΞϓϦଆͱAPIଆͷσʔλϞσϧͷണ཭͕ൃੜ͠ɺΠϯϑϥ૚ͱυϝΠϯ૚ͷ྆ํʹEntity Λ࡞੒ͨ͠

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Πϯϑϥ૚

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Entity

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Entityͷίʔυ ྫ) name, age 2ͭͷϓϩύςΟΛ࣋ͭPersonΫϥε

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data class • ϓϩύςΟʹԠͯ͡equalsɺhashCodeɺtoString ͳͲΛΑ͠ͳʹੜ੒ͯ͘͠ΕΔ • ͍ΘΏΔPOJOΫϥεΛ࡞Δ࣌ʹศར

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Null҆શ (null-safety) • nullͱͳΓಘΔ(Nullable)͔൱(NotNull)͔Λܕ Ͱ໌֬ʹ۠ผ͢Δ • ܕͷޙΖʹ `?` Λ͚ͭͳ͚Ε͹nullΛ୅ೖ͢Δ ͜ͱ͸Ͱ͖ͳ͍

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APIΞΫηε

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Retrofit • Squareࣾ੡ͷAPIΞΫηεͷͨΊͷHTTPΫϥ ΠΞϯτϥΠϒϥϦ • ΠϯλʔϑΣΠε͑͞࡞ͬͯ͠·͑͹ɺ࣮૷ ͸Α͠ͳʹੜ੒ͯ͘͠ΕΔ

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RetrofitMockͱ͍͏ϥΠϒϥϦͰϞοΫΛ࡞੒͢Δ ͜ͱ΋Մೳ

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υϝΠϯ૚

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Model • Πϯϑϥ૚Λར༻͠ɺσʔλΛొ࿥ɾऔಘ • (DDDతʹRepositoryͱ͍͏໊લͷํ͕ద੾ ͔ͩͬͨ΋ɾɾɾ)

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۩ମతͳ࣮૷ͷ࿩Λ͢Δલʹ ิ଍આ໌

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AndroidͷϚϧνεϨου
 ϓϩάϥϛϯάʹ͍ͭͯ • UIͷૢ࡞͸mainεϨουͰߦ͏ • ॏ͍ॲཧΛmainεϨουͰ࣮ߦͯ͠͸͍͚ͳ͍ • UI͕ݻ·Δ • ը໘ͷϥΠϑαΠΫϧʹ஫ҙ͢Δඞཁ͕͋Δ • ը໘͕ഁغ͞ΕͨޙʹαϒεϨου͔ΒmainεϨουΛݺͼग़ͯ͠UI ߋ৽͠Α͏ͱ͢ΔͱམͪΔ • AsyncTaskͱ͍͏ΫϥεΛ࢖͏ͷ͕Ұൠత͕ͩɺίʔυ͕൥ࡶʹͳΓ͕ͪ

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ͦ͜Ͱొ৔͢Δͷ͕

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RxAndroid • ͍͍ײ͡ʹඇಉظॲཧΛѻ͑ΔϥΠϒϥϦ • ObserverύλʔϯΛ؆୯ʹར༻Ͱ͖Δ • RxJavaͷAndroid༻ΤΫεςϯγϣϯ

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unsubscribe͢ΔͱsubscribeॲཧΛ
 ΩϟϯηϧͰ͖Δ

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ϥϜμࣜͱSAMม׵ • ϥϜμࣜͱSAMม׵ʹΑΓɺίʔϧόοΫॲཧΛJava7 ΑΓ؆ܿʹهड़͢Δ͜ͱ͕Ͱ͖Δ

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ϓϨθϯ૚

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Kotlin Android Extensions • JetBrainsࣾͷAndroidStudioϓϥάΠϯ • Activity͔ΒViewཁૉΛϓϩύςΟͱͯ͠ѻ͑ ΔΑ͏ɺࣗಈతʹόΠϯσΟϯάͯ͘͠ΕΔ

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findViewByIdΛҰ૟Ͱ͖Δ

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ςετ

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UIςετ • ࠓճ͸UIςετͷΈΛ࡞੒ • KotlinͰॻ͖͔͕ͨͬͨɺ͕࣌ؒͳ͘ແ೉ʹ JavaͰهड़

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࢖༻ͨ͠ϥΠϒϥϦ • Espresso • Google੡ AndroidͷUIςετ༻ϥΠϒϥϦ • Spoon • Squareࣾ੡ εΫϦʔϯγϣοτΛͱΔϥΠϒϥϦ • MockWebServer • Squareࣾ੡ ϞοΫαʔόʔ

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·ͱΊ • KotlinΛར༻͢ΔͱैདྷͷJava7ΑΓ΋؆ܿͳ ίʔυΛॻ͘͜ͱ͕Մೳ • Kotlinؔ܎ͳ͘ɺAndroid։ൃΛָʹͯ͘͠Ε ΔศརͳϥΠϒϥϦ͕૿͍͑ͯΔ

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• KotlinΛ࢖͑͹࣮ߦ଎౓͕͕͋Δʂͱ͍͏Θ͚Ͱ͸ͳ ͍ͷͰʮJava8Ͱ͍͍͡Όͳ͍ʯͱݴΘΕͯ͠·͏ͱ ʮͦ͏͔΋ʯͱ͍͏ײ͡Ͱ͢ɻ • ͨͩɺ؆ܿʹίʔυΛॻ͚ΔΑ͏ʹߟྀ͞Ε͓ͯΓɺ ؾ࣋Α͘ίʔυΛॻ͚Δݴޠͩͱࢥ͍·͢ɻ • ࠓճɺKotlin͸ಋೖͷෑډ͸௿͍ͱײ͡·ͨ͠ɻ
 Έͳ͞Μ΋ͥͻνϟϨϯδͯ͠Έ͍ͯͩ͘͞ɻ

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͝੩ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ ࢀߟจݙɿ ,PUMJOελʔτϒοΫ৽͍͠"OESPJEϓϩάϥϛϯά௕ᖒଠ࿠