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開発 4 年目のアプリへの Kotlin 導入
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Ryutaro Miyashita
January 26, 2018
Technology
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開発 4 年目のアプリへの Kotlin 導入
DroidKaigi Prelude #dk_prelude
Ryutaro Miyashita
January 26, 2018
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Transcript
։ൃͷΞϓϦͷ,PUMJOಋೖ %SPJE,BJHJ1SFMVEF!%F/"
ٶԼཽେ $IBU8PSLגࣜձࣾ ΫϥΠΞϯτΞϓϦέʔγϣϯ։ൃ෦ !SZVHPP@
,PUMJO
։ൃͷΞϓϦͷ,PUMJOಋೖ ‣ ͷ(PPHMF*0Ͱެࣜ։ൃݴޠԽͨ͠ Ҏલ͔Βಋೖݕ౼͍ͯͨ͠ ެࣜαϙʔτ͕ಘΒΕͨ͜ͱͰ҆৺Λಘͨ ཌ͔ΒಋೖΛ։࢝ͨ͠ʜ͔͠͠ʜ ‣
طଘͷΞϓϦͷಋೖͲ͏ͨ͠Βྑ͍ͷ͔ʁ Ͳ͔͜Βʁ શͯॻ͖͑Δʁ ϋοΩϦ͍ͯ͠ͳ͍͕ɺͬͯΈΑ͏
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ ಋೖॳશͯΛ,PUMJOԽ͢Δ༧ఆແ͔ͬͨ ͡Ί৽ن%JBMPH'SBHNFOU͔Β։࢝ ࣍ʹطଘͷ"DUJWJUZΛ,PUMJOԽ ͦͷޙɺ৽نίʔυΛ,PUMJOͰՃ ‣
+BWBͱͷͭͳ͗ࠐΈ͕ωοΫʹͳ͍ͬͯ͘ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET SFUVSO6OJU*/45"/$& 1MBUGPSN5ZQFT
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET DPNQBOJPOPCKFDUதʹॻ͘ͱTUBUJDʹల։ class SomeFragment : Fragment() {
companion object { @JvmField val TAG: String = SomeFragment::class.java.simpleName } }
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET DPNQBOJPOPCKFDUதʹॻ͘ͱTUBUJDʹల։ class SomeFragment : Fragment() {
companion object { @JvmStatic fun newInstance() = SomeFragment() } }
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ !+WN'JFME!+WN4UBUJD!+WN0WFSMPBET σϑΥϧτҾ͕͋Δ͚ͩΦʔόʔϩʔυ class SomeFragment : Fragment() {
companion object { @JvmStatic @JvmOverloads fun newInstance(id: Long, name: String = "") = SomeFragment() } }
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ SFUVSO6OJU*/45"/$& ؔΛҾʹऔΔॲཧΛ+BWB͔Βݺͼग़͢ͱʁ class Model { fun async(callback:
() -> Unit) { // Some asynchronous processing callback() } }
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ SFUVSO6OJU*/45"/$& lWPJEzͳ͍ͷͰɺl6OJUzΛฦ͢ඞཁ͕͋Δ Model model = new Model();
model.async(() -> { // Some callback processing return Unit.INSTANCE; });
IUUQTEJTDVTTLPUMJOMBOHPSHUKBWBJOUFSPQVOJUDMPTVSFTSFRVJSFEUPSFUVSOLPUMJOVOJU !+WN7PJEͷఏҊ ʹಉ͡ఏى
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ 1MBUGPSN5ZQFT /PO/VMM·ͨ/VMMBCMF͔͠Εͳ͍ܕ "OESPJE4%,جຊతʹ1MBUGPSN5ZQFT !/PO/VMM!/VMMBCMF͕͍͍ͯΕϋοϐʔ val
inflater = LayoutInflater.from(this) ˡฦΓʹlz͕͍͍ͯΔ
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ "OESPJE4%,Ͱ͋ΕதΛݟΔ public static LayoutInflater from(Context context) { LayoutInflater
LayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); if (LayoutInflater == null) { throw new AssertionError("LayoutInflater not found."); } return LayoutInflater; } val inflater: LayoutInflater = LayoutInflater.from(this) ˡͲ͏ΒOVMMʹͳΒͳ͍Β͍͠ ˣ/PO/VMMܕͱͯ͠ѻ͏Α͏ʹ͢Δ
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ "OESPJE4%,Ͱ͋ΕதΛݟΔ lTPVSDFTz͕͋ΔͳΒ"OESPJE4UVEJPͰ $ISPNFͷ"OESPJE4%,4FBSDIΦεεϝ ‣ IUUQCJUMZBOESPJETELTFBSDI
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ "OESPJE4%,Ͱ͋ΕதΛݟΔ lTPVSDFTz͕͋ΔͳΒ"OESPJE4UVEJPͰ $ISPNFͷ"OESPJE4%,4FBSDIΦεεϝ ‣ IUUQCJUMZBOESPJETELTFBSDI ˡιʔεϑΝΠϧͷϦϯΫ͕͘
݁શͯ,PUMJOԽͨ͠ํ͕ϝϦοτ͕େ͖͍ ‣ ࣗୡ͕ॻ͍ͨίʔυʁ !/PO/VMM!/VMMBCMFΛ͚͍ͯ͘ʁ ͍ͬͦͷ͜ͱ,PUMJOʹͯ͠͠·ͬͨํ͕ʁ ‣ ͭͣͭ,PUMJOԽ͍ͯ͘͠
ؔ࿈͢Δ+BWBʹΞ ϊςʔγϣϯΛ͚Δ যΒͣɺΏͬ͘ΓͱͰશͯΛ,PUMJOԽ͢Δ
ݱঢ়
+BWBͷΛ,PUMJOԽ ‣ ϲ݄Ͱؒʹॻ͍ͨ+BWBͷ͕,PUMJOԽ ‣ ϑΝΠϧ ,PUMJO +BWB
+BWBͷΛ,PUMJOԽ ‣ ϲ݄Ͱؒʹॻ͍ͨ+BWBͷ͕,PUMJOԽ ‣ νʔϜͷޮՌ /PO/VMM/VMMBCMFΛڧ͘ҙࣝ͢ΔΑ͏ʹͳͬͨ ‣ !/PO/VMM!/VMMBCMFΞ ϊςʔγϣϯͷ͚Ε͕ͳ͍
‣ ݴޠػೳʹ/VMMTBGFUZ͕͋Δํ͕Εͳ͍͠ҙࣝ͢Δ ‣ ͜Ε·Ͱ+BWBͰ0QUJPOBM"1*͍ͬͯͨ ‣ ͨͩɺ0QUJPOBMΛ͍ͬͯΔͱ,PUMJOଆͰ໘ʜʜ
+BWBͷΛ,PUMJOԽ ‣ ϲ݄Ͱؒʹॻ͍ͨ+BWBͷ͕,PUMJOԽ ‣ νʔϜͷޮՌ ൣғͷWBSΛආ͚ΔΑ͏ʹͳͬͨ ‣ ΠϯελϯεϓϩύςΟͰ͖Δ͚ͩWBM ‣
ϝιουͳͲڱ͍ൣғͰWBS͍ͬͯΔ ‣ -JTU.VUBCMF-JTUͳͲҙࣝతʹ͍͚Λ͍ͯ͠Δ
͓͠·͍ %SPJE,BJHJ1SFMVEF!%F/"