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Androidアプリの 安全なリファクタリングを行うパターン集
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HiroYUKI Seto
October 19, 2021
Programming
2
4.8k
Androidアプリの 安全なリファクタリングを行うパターン集
DroidKaigi 2021 Day1
2021/10/19
HiroYUKI Seto
October 19, 2021
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Transcript
גࣜձࣾϊϋφɹށ༏೭ "OESPJEΞϓϦͷ ҆શͳϦϑΝΫλϦϯάΛߦ͏ύλʔϯू
)JSP:6,*4FUP גࣜձࣾϊϋφ .PCJMF5FDI-FBE "OESPJE&OHJOFFS !TFUP@IJ !IJSPZVLJTFUP
None
w ίʔυϕʔεͷ৽ํ๏ൺֱ w ϑϧεΫϥονͱϦϑΝΫλϦϯά w ϦϑΝΫλϦϯάͰى͜Γ͕ͪͳͱରࡦ w ҆શͳϦϑΝΫλϦϯάͱ w .7$ΞϓϦͷ҆શͳϦϑΝΫλϦϯά
ΞδΣϯμ
͡Ίʹ
w ඞͣϦϑΝΫλϦϯάͰίʔυΛͤʂͱࢥ͍ͬͯͳ͍ w ϝϦοτσϝϦοτΛߟ͑Δ͖ w ڥɾ໘ʹΑͬͯҟͳΔ w εΫϥονͱϦϑΝΫλϦϯάͷΈ߹Θͤ˕ w ࠓճϦϑΝΫλϦϯάͷࣦഊΛݮΒ͢ϙΠϯτͷհ
w ઈରʹࣦഊ͠ͳ͘ͳΔํ๏ͳ͍ ͡Ίʹ
w ςετΛॻ͜͏ w ഁյతมߋͨ͠Βͦͷ෦Λݕূ͠Α͏ ൃදͷཁ
ίʔυϕʔεͷ৽ํ๏ൺֱ
w طଘίʔυΛࣺ͔ͯͯΒཧܕʹॻ͖͢ w ˓͕͠ΒΈ͕ͳ͘։ൃग़͍͢ w ˚৽نόάΛࠐΉՄೳੑ w ˚ݱߦ༷͕ѲͰ͖͍ͯͳ͍ͱ͍͠ w ༷Λ֬ೝ͢Δ͕࣌ؒඞཁ
w ҙਤ͠ͳ͍σάϨͷՄೳੑ ϑϧεΫϥον
w طଘίʔυΛॻ͖͑ͯཧܕʹ͍࣋ͬͯ͘ w ˓༷ΛѲ͍ͯ͠ͳͯ͘Ͱ͖Δ w ϦϑΝΫλͯ͠ίʔυ͔Β༷ΛಡΈղ͘ w ˚৽نόά طଘόάʹۤ͠ΉՄೳੑ w
˚طଘ࣮ʹҾͬுΒΕͯ։ൃ͕ग़ͳ͍Մೳੑ ϦϑΝΫλϦϯά
ൺֱද ϑϧεΫϥον ϦϑΝΫλϦϯά ɾ։ൃ গ ։ൃ˓ ଟ ։ൃ˚ ༷ҡ࣋
˚ ҙਤ͠ͳ͍σάϨΛ͢ΔՄೳੑ ˓ όά ΤϯόάͷՄೳੑ Τϯόά طଘόάΛܧଓͷՄೳੑ ͦͷଞ ݱঢ়༷ΛѲ͍ͯ͠ͳ͍ͱ ࣮͠ͳ͕Β༷Ѳ͔Մ
ϦϑΝΫλϦϯάͰ ى͜Γ͕ͪͳͱରࡦ
w ֎෦ಈ࡞༷Ϣʔβʔʹݟ͑Δಈ࡞ w ඇഁյతมߋ w ෦ಈ࡞ʹӨڹ͕ͳ͍ϝιουΫϥεͷཧ w ഁյతมߋ w ෦ಈ࡞มΘ͕ͬͨ֎෦ಈ࡞༷มΘ͍ͬͯͳ͍߹
w ྫɿΞϧΰϦζϜมߋɺ+TPO1BSTFSมߋ w ෦ಈ࡞֎෦ಈ࡞༷มΘΔ߹ w ྫɿ༷มߋɺϥΠϑαΠΫϧมߋɺϝϞϦϦʔΫमਖ਼ ඇഁյతมߋഁյతมߋ
w ͱʹ͔͘طଘಈ࡞͕յΕΔ w ͪΐͬͱม͚͑ͨͩͳͷʹյΕͨ w յΕͳ͍ͣͷमਖ਼ͰյΕͨ w ఆ֎ͷ෦͕ಈ͔ͳ͘ͳͬͨ ى͜Γ͕ͪͳ
w ఆ͍ͯ͠ͳ͍ഁյతมߋ w ϦϑϨΫγϣϯɺੜίʔυͷࢀর w ϥΠϒϥϦͷΞοϓσʔτ w $IBOHFMPHʹͳ͍मਖ਼ w ଞΞϓϦ'SBNFXPSLͱͷ࿈ܞ
w ݕূ͕͍͠ w ϥΠϑαΠΫϧɺඇಉظॲཧ w ෳ߹తͳཁҼ ఆ֎ͷݪҼ ରࡦ͍͠
w ݕূΛखް͘Εग़ʹ͘͘ͳΔ w 㱻ݕূϦιʔε͕ඞཁʹͳΔ w ഁյతมߋʹΑͬͯಈ࡞͕յΕ͍ͯΔ w ඇഁյతมߋͰಈ࡞มΘΒͳ͍ w ݕূΛബͯ͘͠ग़ʹ͍ͣ͘
w ഁյతมߋΛݕূ͢Ε͕ݟ͔ͭΓ͍ͣ͢ w ෦ಈ࡞͕ҙਤͨ͠௨Γ w ֎෦ಈ࡞༷͕ҙਤͨ͠௨Γ ݪҼੳͱରࡦ
w ഁյతมߋඇഁյతมߋΛ໌֬ʹ͢Δ w मਖ਼ޙͷಈ࡞ΛݕূͰ͖Δঢ়ଶʹ͢Δ w ՄೳͳݶΓࣗಈςετͰݕূ͢Δ w ഁյతมߋΛͨ͠Λݕূ͢Δ w ෦ಈ࡞͕ҙਤͨ͠ͷͰ͋Δ͜ͱ
w ෦ಈ࡞Λม͑ͯ֎෦ಈ࡞༷͕ಉҰͰ͋Δ͜ͱ w ֎෦ಈ࡞༷͕ҙਤͨ͠ͷͰ͋Δ͜ͱ ҆શͳϦϑΝΫλϦϯά
w ҆શͳϦϑΝΫλϦϯάͷͨΊʹܭըΛཱͯΔ w ணखલʹΰʔϧ·ͰͷεςοϓΛׂ͢Δ w ΰʔϧͷํੑ͕ͳ͍ঢ়ଶͰ໎͕ͪ͠ w ഁյతมߋඇഁյతมߋΛࠞͥͳ͍ w εςοϓͷഁյతมߋΛগͳ͘͢Δ
w ݕূΛ؆୯ʹ͢ΔͨΊ εςοϓׂ
w ✅ͦͷεςοϓʹΑͬͯݕূ͕Ͱ͖ΔΑ͏ʹͳΔ͔ w ✅ഁյతมߋ͔ w ✅Ͳ͕͜ഁյతมߋ͔ w ✅ഁյతมߋʹݕূํ๏͕͋Δ͔ εςοϓׂνΣοΫϙΠϯτ
w 㲈ςετ͕ॻ͚ΔΑ͏ʹͳΔ͔ w ϦϑΝΫλϦϯά͢ΔͳΒࢦ͖͢ΰʔϧ w ࣗಈςετͰಈ࡞อূͰ͖Εखಈͷݕূίετ͕ݮΔ w मਖ਼ͨ͠ίʔυ͕ҙਤͨ͠ಈ࡞Λ͍ͯ͠Δ͔ͷݕূ w ඇഁյతมߋͳΒಈ࡞ʹมߋͳ͍ͣ
w ݕূΛՃͤͣઌͷ։ൃΛٻΊΔ͜ͱՄ ✅ݕূ͕Ͱ͖ΔΑ͏ʹͳΔ͔
w ಈ࡞͕มΘ͕ͬͨ͋Δ͔ w ෦ಈ࡞มΘ͕ͬͨ֎෦ಈ࡞༷มΘ͍ͬͯͳ͍߹ w ෦ಈ࡞֎෦ಈ࡞༷มΘΔ߹ ✅ഁյతมߋ͔
w ෦࣮ w εΫϥον։ൃ w ΞϧΰϦζϜมߋ w ґଘϥΠϒϥϦมߋ w +BWBˠ,PUMJOͷOVMMBCJMJUZ
w ֎෦ಈ࡞༷ w "OESPJEͷϥΠϑαΠΫϧมߋ w ΞϓϦͷ༷ ✅Ͳ͕͜ഁյతมߋ͔
w ෦ಈ࡞มΘ͕ͬͨ֎෦ಈ࡞༷มΘ͍ͬͯͳ͍߹ w มߋલͱมߋޙͷಈ࡞͕ಉҰͰ͋Δ͜ͱͷݕূ w ෦ಈ࡞֎෦ಈ࡞༷มΘΔ߹ w ҙਤ௨Γಈ͘͜ͱͷݕূ w ݕূํ๏
w ࣗಈςετ 6OJU5FTUɺ6*5FTUɺ7JTVBM3FHSFTTJPO5FTU w खಈςετͰͷݕূɺ2"Ͱͷݕূ w શͯͷมߋΛݕূ͢ΔͷෆՄ ✅ഁյతมߋʹݕূํ๏͕͋Δ͔
w ఆ͍ͯ͠ͳ͍ഁյతมߋ w ϦϑϨΫγϣϯɺੜίʔυͷࢀর w ϥΠϒϥϦͷΞοϓσʔτ w $IBOHFMPHʹͳ͍मਖ਼ w ଞΞϓϦ'SBNFXPSLͱͷ࿈ܞ
w ݕূ͕͍͠ w ϥΠϑαΠΫϧ w ෳ߹తͳཁҼ ఆ֎ͷݪҼ ରࡦ͍͠
w ϦΞʔΩςΫνϟͷࡍ "OESPJEͰσʔλ͔Βணख͢Δͱྑ͍ εςοϓׂUJQT ݹ͍%BUB ৽͍͠6* ݺͼग़͠ ෆ҆ఆͳ݁Ռ
ѻ͍ʹ͍͘ܕ ෆ҆ఆͳ݁Ռ Λߟྀ࣮ͨ͠
w ϦΞʔΩςΫνϟͷࡍ "OESPJEͰσʔλ͔Βணख͢Δͱྑ͍ εςοϓׂUJQT ৽͍͠%BUB ݹ͍6* ݺͼग़͠ ҆ఆͨ݁͠Ռ
6*৽ͷࡍ ҆ఆ࣮ͨ͠
.7$ΞϓϦͷϦϑΝΫλϦϯά
w IUUQTHJUIVCDPNIJSPZVLJTFUPESPJELBJHJTBNQMF w NBJO͕ݩͷίʔυ w ϦϑΝΫλϦϯάͨ͠ͷͰ13 w ϘλϯΛԡ͢ͱ௨৴ͯ͠ 3FTQPOTF$PEFΛදࣔ
αϯϓϧϦϙδτϦ
αϯϓϧίʔυ ελʔτ ΰʔϧ ΞʔΩςΫνϟ .7$ .77. 3FDPNNFOEFE"QQ"SDI 7JFXૢ࡞
"DUJWJUZͰૢ࡞ %BUB#JOEJOH ""$7JFX.PEFM -JWF%BUB ௨৴ॲཧ "DUJWJUZʹͨॻ͖ 3FNPUF%BUBTPVSDF ඇಉظॲཧ "TZOD5BTL %FQSFDBUFE $PSPVUJOF
w IUUQTEFWFMPQFSBOESPJEDPNKFUQBDLHVJEFSFDPNNFOEFEBQQBSDI 3FDPNNFOEFE"QQ"SDIJUFDUVSF
αϯϓϧίʔυ 'SBHNFOU "TZOD5BTL 8FCTFSWJDF 'SBHNFOU 7JFX.PEFM 3FQPTJUPSZ 3FNPUF%BUB4PVSDF 8FCTFSWJDF
-JWF%BUB ελʔτ ΰʔϧ
αϯϓϧίʔυ ελʔτ 'SBHNFOU
3FNPUF%BUBTPVSDFͷ࡞ 3FQPTJUPSZͷ࡞ 7JFX.PEFMͷಋೖ -JWF%BUBͷಋೖ .77.Խ
$PSPVUJOFԽ εςοϓׂ
4UFQ3FNPUF%BUB4PVSDFͷ࡞ 'SBHNFOU "TZOD5BTL 8FCTFSWJDF 3FNPUF%BUB4PVSDF 8FCTFSWJDF #FGPSF "GUFS 'SBHNFOU
"TZOD5BTL
4UFQ3FNPUF%BUB4PVSDFͷ࡞
w ඇഁյతมߋ w ॲཧͷΫϥεΓग़͠ͷΈ w 0L)UUQ$MJFOUΛΫϥεมʹ͕ͨ͠ɺ4UFQͷ࣮ͳΒඇഁյత w 3FNPUF%BUB4PVSDFͷΠϯελϯεΛ͍ճ͢ͱഁյత 4UFQ3FNPUF%BUB4PVSDFͷ࡞
w ௨৴෦ͷ࣮͕ෛ࠴ͳ͜ͱଟʑ w ϦϑΝΫλ͢Δʹ w ςετΛॻ͍ͯϦΫΤετϨεϙϯεͷQBSTF݁ՌΛอূ͢Δ w ෛ࠴ΫϥεΛॻ͖͍͑ͯ͘ w NPDLLͷTMPUΛͬͯ௨৴पΓͷෛ࠴ղফͷϦϑΝΫλϦϯάΛ͢Δ
w IUUQTRJJUBDPNIJSPZVLJTFUPJUFNTFFCGFG ༨ஊ௨৴෦ॻ͖͍͑ͨ
ϒϥοΫϘοΫεͷ͠ํ ϒϥοΫϘοΫε ݺͼग़͠ ݁Ռ 8SBQQFSΫϥε ݺͼग़͠ ݺͼग़͠ ݁Ռ ݁Ռ
ςετͰอূ ςετ ݺͼग़͠ ݁Ռ ྑ͍࣮ ݺͼग़͠ ݁Ռ "OESPJEςετશॻ1/FUXPSL6UJMTͷྫ
4UFQ3FQPTJUPSZͷ࡞ 3FQPTJUPSZ 8FCTFSWJDF #FGPSF "GUFS 'SBHNFOU "TZOD5BTL 3FNPUF%BUB4PVSDF 3FNPUF%BUB4PVSDF
8FCTFSWJDF 'SBHNFOU "TZOD5BTL
4UFQ3FQPTJUPSZͷ࡞
w ඇഁյతมߋ w ΫϥεΓग़͠ͷΈ w ݕূͷՃ w 6OJU5FTU͕ॻ͚ΔΑ͏ʹͳΔ 4UFQ3FQPTJUPSZͷ࡞
6OJU5FTU
4UFQ7JFX.PEFMͷಋೖ 3FQPTJUPSZ 8FCTFSWJDF #FGPSF "GUFS 'SBHNFOU "TZOD5BTL 3FNPUF%BUB4PVSDF 3FQPTJUPSZ
8FCTFSWJDF 'SBHNFOU "TZOD5BTL 3FNPUF%BUB4PVSDF 7JFX.PEFM
4UFQ7JFX.PEFMͷಋೖ 'SBHNFOU
4UFQ7JFX.PEFMͷಋೖ w ֎෦ಈ࡞༷ಉҰͳഁյతมߋ w ճͷ࣮ߦ࣌ʹ3FQPTJUPSZ͕͍ճ͞ΕΔ w ഁյతมߋͷݕূ w ճͷ࣮ߦ֎෦ಈ࡞༷͕ಉҰͰ͋Δ͜ͱ
w 6*5FTUɺखಈςετͳͲ w ʮճͷ࣮ߦͰҙਤͨ͠ಈ࡞ʯͷ6*5FTUෆໟͳͷͰखಈ͕Α͍
w ϦϑΝΫλϦϯάͷ్தͰઃܭͱͯ͠ඍົʹͳΔ͜ͱ w ʮݕূ͢ΔͨΊʯʮ࠷ऴతʹ៉ྷʹͳΔʯͱׂΓΔ w தؒঢ়ଶͷ··Ͱ์ஔઈରʹආ͚Δ w ࠷ॳʹνʔϜϝϯόʔʹमਖ਼ํΛڞ༗͢Δ ϙΠϯτதؒঢ়ଶΛݏ͕Βͳ͍
4UFQ-JWF%BUBͷಋೖ 'SBHNFOU 7JFX.PEFM 3FQPTJUPSZ 3FNPUF%BUB4PVSDF 8FCTFSWJDF -JWF%BUB #FGPSF "GUFS
3FQPTJUPSZ 8FCTFSWJDF 'SBHNFOU "TZOD5BTL 3FNPUF%BUB4PVSDF 7JFX.PEFM "TZOD5BTL
4UFQ-JWF%BUBͷಋೖ 'SBHNFOU "TZOD5BTL 7JFX.PEFM
w ֎෦ಈ࡞༷มΘΔഁյతมߋ w PO4UBSUͱPO4UPQͷ͔ؒ͠6*͕ө͞Εͳ͍ w ݕূͷՃ w 6OJUςετ w -JWF%BUBʹ͕ೖ͍ͬͯΔ͜ͱͷ֬ೝ
w ഁյతมߋͷݕূ w खಈ֬ೝ w ࣗಈςετ͕͍͠ϥΠϑαΠΫϧؔ࿈ 4UFQ-JWF%BUBͷಋೖ
w ֎෦༷ಉҰͳഁյతมߋ w 7JFXͱͷΓͱΓ͕%BUB#JOEJOHܦ༝ʹ w ഁյతมߋͷݕূ w 6*5FTUJOH w .77.ԽલޙͰಉ͡6*ςετ͕ಈ࡞͢Δ͜ͱ
w खಈςετ w 6*5FTUͰΧόʔ͖͠Εͳ͍෦ 4UFQ.77.Խ
w 6*5FTU
4UFQ$PSPVUJOFԽ #FGPSF "GUFS 'SBHNFOU 7JFX.PEFM 3FQPTJUPSZ 3FNPUF%BUB4PVSDF 8FCTFSWJDF -JWF%BUB
'SBHNFOU 7JFX.PEFM 3FQPTJUPSZ 3FNPUF%BUB4PVSDF 8FCTFSWJDF -JWF%BUB "TZOD5BTL
4UFQ$PSPVUJOFԽ 7JFX.PEFM
w ֎෦༷มΘΔഁյతมߋ w "TZOD5BTLˠ$PSPVUJOFͰඇಉظॲཧ͕ࠜຊ͔ΒมΘΔ w 7JFX.PEFMPO$MFBS 'SBHNFOUPO%FTUSPZ Ͱඇಉظॲཧऴྃ w "TZOD5BTL࣌ͷϝϞϦϦʔΫमਖ਼
w ഁյతมߋͷݕূ w "TZOD5BTLΛ$PSPVUJOFʹஔ͖͑ͯ6OJU5FTU͕௨Δ͜ͱ w खಈςετϥΠϑαΠΫϧ PO%FTUSPZ 4UFQ$PSPVUJOFԽ
αϯϓϧίʔυ 'SBHNFOU "TZOD5BTL 8FCTFSWJDF 'SBHNFOU 7JFX.PEFM 3FQPTJUPSZ 3FNPUF%BUB4PVSDF 8FCTFSWJDF
-JWF%BUB #FGPSF "GUFS
w 'SBNFXPSLϥΠϒϥϦͷಈ࡞ΛΔ w ഁյతมߋΛݟམͱ͢Մೳੑ͕ݮΔ w "OESPJEͰಛʹϥΠϑαΠΫϧΛҙࣝ͢Δ w ෦࣮ΛಡΉͷ͕Φεεϝ ϙΠϯτಈ࡞ΛΔ
w ΤϥʔΛચ͍ग़ͯ͠ॲཧํ๏ΛܾΊΔ w ϦΞʔΩςΫνϟͷࡍॲཧ͢ΔΛܾΊΔ w IUUQTTQFBLFSEFDLDPNLHNZTIJOBOESPJEBQQFSSPSIBOEMJOH ϙΠϯτΤϥʔॲཧ
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w ܭըΛཱͯͯϦϑΝΫλϦϯάΛ͠Α͏ w ςετΛॻ͜͏ w ഁյతมߋͨ͠Βͦͷ෦Λݕূ͠Α͏ ൃදͷཁ