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Java で書かれた Android アプリを Kotlin で書き直すまでの話 / ...
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Ryutaro Miyashita
July 03, 2018
Technology
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Java で書かれた Android アプリを Kotlin で書き直すまでの話 / Talk of rewrite Android app for Java to Kotlin
集まれ Kotlin 好き ! Kotlin 愛好会 vol 2 @ DeNA
Ryutaro Miyashita
July 03, 2018
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Transcript
+BWBͰॻ͔Εͨ"OESPJEΞϓϦΛ ,PUMJOͰॻ͖͢·Ͱͷ ू·Ε,PUMJO͖,PUMJOѪձWPM
ٶԼཽେ $IBU8PSLגࣜձࣾ ΫϥΠΞϯτΞϓϦέʔγϣϯ։ൃ෦ !SZVHPP@ ͖ͳ,PUMJOͷػೳ4NBSU$BTU
$IBU8PSL
$IBU8PSL ‣ Ϗδωε͚ͷνϟοταʔϏε 8FCJ04"OESPJEσεΫτοϓΞϓϦͰఏڙ "OESPJEΞϓϦ͔Β+BWB ‣ ʙ·Ͱ5JUBOJVN +BWB4DSJQU
ͩͬͨ ‣ +BWB൛͔Β։ൃΛ։࢝ ‣ ,PUMJOΛݕ౼͢ΔͨΊʹͷ,PUMJOษڧձʹࢀՃ ‣ ࠾༻ڧԽத J04"OESPJE4DBMB1)143&ͳͲ ৄ͘͠8FCαΠτͰ ‣ IUUQTDPSQDIBUXPSLDPNKBSFDSVJU ‣ ؾʹͳΔ͜ͱ͕͋ͬͨΒ͔͚ͯԼ͍͞
,PUMJO
,PUMJO ‣ (PPHMF*0Ͱ"OESPJEެࣜݴޠԽ ͦΕ·Ͱ,PUMJOͷ։ൃࣄྫଟ͋ͬͨ͘ ެࣜݴޠʹͳΔ͜ͱͰ҆৺ΛखʹೖΕͨ طଘͷΞϓϦͱͷ͖߹͍ํΛͲ͏͢Δ͔ʁ ‣
෦తʹಋೖPSશ໘తʹಋೖ ͜Εͱ͍ͬͨਖ਼ղͳ͍ ৽نϓϩδΣΫτͳΒ,PUMJOͰྑ͍ $IBU8PSLͰશ໘తͳಋೖΛܾఆͨ͠
Ͳ͔͜Β ‣ ಋೖॳશ໘తͳಋೖ༧ఆͳ͔ͬͨ খ͞ͳμΠΞϩά͔ͭΒಋೖΛ։࢝ ‣ (PPHMF*0ͷཌ͔Βελʔτ ࣍ʹطଘͷը໘Λͭॻ͖͑ͯΈͨ
৽͍͠ػೳͷՃΛ,PUMJOͰॻ͍ͯΈͨ ‣ +BWBͱͷͭͳ͗ࠐΈ͕ωοΫʹͳ͍ͬͯͬͨ ͔֬ʹ,PUMJO+BWBͱͷ࿈ܞόονϦͰ͖Δ ͏·͘࿈ܞ͢Δʹಛผͳҙ͚͕ࣝඞཁ ‣ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET ‣ SFUVSO6OJU*/45"/$& ‣ 1MBUGPSN5ZQFT
!+WNʙΞ ϊςʔγϣϯ ‣ +BWB͔ΒͷΞΫηεΛҙࣝ͢Δඞཁ͕͋Δ class MyFragment : Fragment() { companion
object { @JvmField val TAG: String = MyFragment::class.java.simpleName } @JvmOverloads fun logic(label: String = "") {} } ,PUMJO
SFUVSO6OJU*/45"/$& ‣ ,PUMJOʹlWPJEzଘࡏ͠ͳ͍ class BusinessLogic { fun async(callback: () ->
Unit) { // Some async logic callback(); } } BusinessLogic logic = new BusinessLogic(); logic.async(() -> { return Unit.INSTANCE; }); ,PUMJO +BWB
IUUQTEJTDVTTLPUMJOMBOHPSHUKBWBJOUFSPQVOJUDMPTVSFTSFRVJSFEUPSFUVSOLPUMJOVOJU !+WN7PJEͷఏҊ ʹಉ͡ఏى
1MBUGPSN5ZQFT ‣ /PO/VMM͔/VMMBCMF͔એݴ͞Ε͍ͯͳ͍ܕ ܕใΛݟΔͱlzϚʔΫ͕͍͍ͯΔ ‣ "OESPJE4%,جຊతʹ1MBUGPSN5ZQFT ‣ !/PO/VMM!/VMMBCMF͕͍ͯͨΒϥοΩʔ
1MBUGPSN5ZQFT ‣ "OESPJE4%,Ͱ͋ΕίʔυΛಡΜͰܕΛܾఆ͢Δ val inflater: LayoutInflater = LayoutInflater.from(this) ,PUMJO
,PUMJOͷ͏·ຯΛҾ͖ग़͍ͨ͠ ‣ ,PUMJOΛ෦తʹಋೖ͢Δͱ+BWBʹӨڹ͕ग़Δ ٯʹ+BWBͷ࣮͕,PUMJOʹӨڹ͢Δ ‣ +BWB0QUJPOBMWT,PUMJO/PO/VMM/VMMBCMF5ZQF ࣗୡ͕ॻ͍ͨ+BWBͷίʔυΛݟฦ͢ ‣
!/PO/VMM!/VMMBCMFΞ ϊςʔγϣϯΛ͚͍ͯ͘ʁ ‣ ͍ͬͦͷ͜ͱ,PUMJOʹஔ͖͑ͨํ͕ྑ͍ͷͰͳ͍͔ʁ ‣ ͭͣͭஸೡʹ,PUMJOԽΛਐΊ͍ͯ͘ ਓͷνʔϜͰ,PUMJOͷशख़όϥόϥ ૬ޓʹϨϏϡʔΛ͠ͳ͕ΒཧղΛਂΊ͍ͯ͘ 1VMM3FRVFTUʹ,PUMJOͷݴޠػೳͷઆ໌Λॻ͘
,PUMJOͷ͏·ຯΛҾ͖ग़͢ಓఔ (PPHMF*0b $IBU8PSL"OESPJE 7FSTJPO 'VMM+BWB ߦ $IBU8PSL"OESPJE
7FSTJPO 'VMM,PUMJO ߦ Ի௨ "OESPJE ߦ
,PUMJOͷ͏·ຯΛҾ͖ग़ͨ݁͠Ռ ‣ ϲ݄ͰશͯͷίʔυΛ,PUMJOԽͨ͠ ͦͷؒʹػೳՃϦϑΝΫλϦϯάͰ͖ͨ ,PUMJOԽલޙͰίʔυͷྔʹͳͬͨ ‣ νʔϜͷਁಁͱޮՌ
/VMM1PJOUFS&YDFQUJPOͷ໓ ‣ ΄΅ग़ձ͍ͬͯͳ͍ ‣ 1MBUGPSN5ZQFTͷऔΓѻ͍͕పఈ͞Εͨ ‣ +BWBͷ0QUJPOBMΑΓऔΓѻָ͍͕ ίʔυͷՄಡੑͷ্ ‣ جຊWBMͰڱ͍ൣғͰWBSΛ͏ͳͲͷҙ͚ࣝ
,PUMJOͷ͏·ຯΛҾ͖ग़ͨ͢Ίʹ ‣ ,PUMJOଆͷ࣮ݟͨํ͕ྑ͍ ྫ͑NBQˠUP-JTUͷྲྀΕ ‣ +BWBͷ4USFBNΛͬͯΔͱ͍ͭΓͨ͘ͳΔ ‣ ࣮ࡍNBQͷ࣌Ͱ-JTU3͕ಘΒΕΔ val
results: List<R> = someCollection .map { it.convert() } .toList() ,PUMJO
,PUMJOͷ͏·ຯΛҾ͖ग़ͨ͢Ίʹ ‣ 4IPX,PUMJO#ZUFDPEFˠ%FDPNQJMF͢Δ val source = listOf(1, 2, 3, 4,
5) val results: List<String> = source .map { it.toString(10) } ,PUMJO UP-JTUແ UP-JTU༗
,PUMJOͷ͏·ຯΛҾ͖ग़͠ଛͶͨࣄྫ ‣ ,PUMJOͱ"OESPJE +%, ͷ"1*͕ಉ໊͡લ ‣ ਖ਼ղ൪ԼͷGPS&BDIͰͨ͠ʂ ൪ԼLPUMJODPMMFDUJPOTGPS&BDI ‣
.BQͷ֦ுؔͱͯ͠ఆٛ͞Ε͍ͯΔ ্͔ΒͭΊKBWBVUJM.BQGPS&BDI ‣ "OESPJEͰ͑ΔΑ͏ʹͳͬͨͷ-W͔Β ‣ /P$MBTT%FG'PVOE&SSPS͕ൃੜͨ͠
࠷ޙʹ
࠷ޙʹ ‣ طଘͷΞϓϦஈ֊తʹ,PUMJOԽ͍͚ͯ͠Δ ͨ +BWBͱͷ૬ޓӡ༻ੑͷߴ͞ ‣ த్ʹಋೖ͢Δ͙Β͍ͳΒશͯॻ͖͍͑ͨ
+BWBͱ,PUMJOؒͰͦΕͧΕΛҙࣝ͢Δखؒ ‣ ਓखͰؾΛ͚ͭͳ͍ͱ͍͚ͳ͍Օॴඞͣࣄނ͕ੜ·ΕΔ ‣ ଞνʔϜ͔Βݟͨ৺ཧతোน͕Լ͕ͬͨ ෭࣍తͳޮՌ ‣ J04νʔϜ͕,PUMJOͷίʔυΛಡΜͰ4XJGUʹҠ২ ‣ 4DBMB ؚ4DBMB+4 5ZQF4DSJQU͍༰қʹಡΊΔ
͓͠·͍