1年ぶりにやりなおすKotlinアプリ開発
by
Kazuya Kitahara
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1ͿΓʹΓͳ͓͢KotlinΞϓϦ։ൃ .HSBN*OD ݪ
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ࣗݾհ w ݪ w גࣜձࣾNHSBNʢچגࣜձࣾ-JQʣΤϯδχΞ w ۀϝϯόʔͷ̍ਓͰ͢ɻ w લʹϛΫγΟ͔Βస৬͠·ͨ͠ɻ w "OESPJEϝΠϯɻ8FCɾJ04ঢ়گʹԠͯ͡։ൃ w झຯөըɾອը
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γϯɾΰδϥͷҠಈܦ࿏Λਤ্ͰΞχϝʔγϣϯ w U (&0(3"1)*$0'(0%;*--" IUUQHFPHPE[JMMBUL
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ΤϜάϥϜੑ֨அ w ͷ࣭Ͱੑ֨Λਖ਼֬அ w ΩϟονʔͳΞτϓοτ w ແྉ w ϲ݄Ͱສਓͷํ͕அ
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1ͿΓʹΓͳ͓͢KotlinΞϓϦ։ൃ
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͢ࣄ w ͿΓʹ,PUMJOΛ৮ͬͯࢥͬͨࣄ w ,PUMJOͱҰॹʹར༻ՄೳͳϥΠϒϥϦ
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ͿΓʹ,PUMJOΛ৮ͬͯࢥͬͨࣄ
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͑ΔϥΠϒϥϦ͕૿͑ͯΔ w "OOPUBUJPOϓϩηοαʔΛར༻͍ͯ͠ΔϥΠϒϥϦ ͑ͨΓ͑ͳ͔ͬͨΓ͍ͯͨ͠ w %BHHFS%BUB#JOEJOH͏·͘ಈ͔ͳ͔ͬͨΑ͏ʹه Ա w ৭ΜͳϥΠϒϥϦ͕͑ΔΑ͏ʹͳͬͯΔʂ
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,PUMJOͷهࣄ͕૿͑ͯΔ w 8FC্Ͱ,PUMJOͷղઆΛͯ͠Δهࣄ͕૿͑ͯͯ͘͢͝ॿ͔ Γ·ͨ͠ɻ w 2JJUBͰ,PUMJOΛݕࡧͯ͠ΈΔͱɺݱࡏߘఔ͋Γ·͢ ͕ɺd·Ͱʹͯ͠ΈΔͱߘ͙Β͍ͩͬͨͷ Ͱɺ͜͜ͰഒҎ্ʹ૿͍͑ͯ·͢ɻ
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ͬͺΓ,PUMJO͍͍͢ w FOVN w ԆϓϩύςΟ w HFUUFSTFUUFS w ֦ுؔ ಛʹ͖͢ͳػೳ
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FOVN (FOEFSLU FOVNDMBTT(FOEFS WBMKQ4USJOH \ NBMF உੑ GFNBMF ঁੑ PUIFS ͦͷଞ ^ w ྻڍܕ w ,PUMJOͷFOVN؆୯ʹΛ࣋ͨͤΔࣄ͕Ͱ͖ͯศར w 'SBHNFOU1BHFS"EBQUFSͷදࣔॱΛFOVNͰཧͯ͠·͢
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FOVN .BJO1BHFLU FOVNDMBTT.BJO1BHF\ 1"(&\ PWFSSJEFGVOGSBHNFOU 'SBHNFOU\ SFUVSO1"(&'SBHNFOUOFX*OTUBODF ^ ^ 1"(&\ PWFSSJEFGVOGSBHNFOU 'SBHNFOU\ SFUVSO1"(&'SBHNFOUOFX*OTUBODF ^ ^ BCTUSBDUGVOGSBHNFOU 'SBHNFOU ^
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FOVN .BJO1BHFS"EBQUFSLU DMBTT.BJO1BHFS"EBQUFS GN'SBHNFOU.BOBHFS 'SBHNFOU4UBUF1BHFS"EBQUFS GN \ PWFSSJEFGVOHFU*UFN QPTJUJPO*OU 'SBHNFOU \ SFUVSO.BJO1BHFWBMVFT GSBHNFOU ^ PWFSSJEFGVOHFU$PVOU *OU\ SFUVSO.BJO1BHFWBMVFT TJ[F ^ PWFSSJEFGVOHFU1BHF5JUMF QPTJUJPO*OU $IBS4FRVFODF\ SFUVSO.BJO1BHFWBMVFT TDSFFO/BNF ^ ^
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ԆϓϩύςΟ WBMHSBNCZMB[Z\lNHSBNz^ w ͡ΊͯΞΫηε͞Εͨͱ͖ʹܭࢉ͞ΕΔϓϩύςΟ w ฐࣾͰɺ'SBHNFOUʹ͢ͱ͖ʹ1BSDFMBSͱ߹Θͤͯ ͬͯ·͢ɻ
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ԆϓϩύςΟ 'SBHNFOUͰͷར༻ྫ DPNQBOJPOPCKFDU\ GVOOFX*OTUBODF VTFS6TFS 6TFS%JBMPH'SBHNFOU\ WBMBSHT#VOEMF BQQMZ\ QVU1BSDFMBCMF 4FSJBMJ[F,FZ64&3OBNF 1BSDFMTXSBQ VTFS ^ SFUVSO6TFS%JBMPH'SBHNFOU BQQMZ\ BSHVNFOUTBSHT ^ ^ ^
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ԆϓϩύςΟ ԆϓϩύςΟͰWBMʹͰ͖Δ QSJWBUFWBMVTFS6TFSCZMB[Z\ 1BSDFMTVOXSBQ6TFS BSHVNFOUTHFU1BSDFMBCMF 4FSJBMJ[F,FZ64&3OBNF ^ ԆϓϩύςΟΛར༻͠ͳ͍߹ QSJWBUFMBUFJOJUWBSVTFS6TFS PWFSSJEFGVOPO$SFBUF TBWFE*OTUBODF4UBUF#VOEMF \ TVQFSPO$SFBUF TBWFE*OTUBODF4UBUF VTFS1BSDFMTVOXSBQ6TFS BSHVNFOUTHFU1BSDFMBCMF 4FSJBMJ[F,FZ64&3OBNF ^
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HFUUFSTFUUFS w ,PUMJOͰHFUUFSTFUUFSͷఆָ͕ٛ͘͢͝Ͱ͢ɻ w ฐࣾͰɺ%BUBCJOEJOHʹ͢0CTFSWBCMFͳ.PEFM 7JFX.PEFMΛ࡞͢ΔࡍʹΑ͍ͬͯ͘·͢ɻ
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HFUUFSTFUUFS 7JFX.PEFM DMBTT6TFS7JFX.PEFM #BTF0CTFSWBCMF \ !#JOEBCMF WBSNBJM4USJOH TFU NBJM \ pFMENBJM OPUJGZ1SPQFSUZ$IBOHFE #3NBJM OPUJGZ1SPQFSUZ$IBOHFE #3WBMJE ^ !HFU#JOEBCMF WBSWBMJE#PPMFBOGBMTF HFU \ JG UIJTNBJMJT/VMM0S&NQUZ SFUVSOGBMTF WBMNBUDIFS1BUUFSOT&."*-@"%%3&44NBUDIFS UIJTNBJM SFUVSONBUDIFSNBUDIFT ^ ^
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֦ுؔ w طଘͷΫϥεʹରͯ͠ޙ͔ΒϝιουΛՃ͢Δࣄ͕Ͱ͖ Δػೳ w #JOEJOH"EBQUFSΛՃ͢Δͱ͖ʹΑͬͯ͘·͢ɻ
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֦ுؔར༻͠ͳ͍߹ 1JDBTTPͷMPBE*NBHF PCKFDU*NBHF7JFX#JOEJOH"EBQUFS\ !#JOEJOH"EBQUFS CJOEJNBHF6SM !+WN4UBUJD GVOMPBE*NBHF WJFX*NBHF7JFX VSM4USJOH \ 1JDBTTPXJUI WJFXDPOUFYU MPBE JNBHF6SM JOUP WJFX ^ ^
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֦ுؔར༻ͨ͠߹ 1JDBTTPͷMPBE*NBHF !#JOEJOH"EBQUFS CJOEJNBHF6SM GVO*NBHF7JFXMPBE*NBHF JNBHF6SM4USJOH \ 1JDBTTPXJUI UIJTDPOUFYU MPBE JNBHF6SM JOUP UIJT ^
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ඍົͩͬͨॴɿMJOU w લMJOUͷ݁Ռ͕͍·͍ͪͩͬͨ w ,PUMJO͔Βࢀর͞Ε͍ͯΔSFTPVSDF6OVTFE3FTPVSDFͷ XBSOJOH͕ग़Δࣄ w मਖ਼͞Ε͍ͯΔࣄΛظͯ͠·͕ͨ͠ɺΫϥεʹΑͬͯXBSOJOH ग़ͨΓग़ͳ͔ͬͨΓͯͯ͠·ͩ͑ͳ͍༷Ͱ͢ɻ
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,PUMJOͱҰॹʹར༻ՄೳͳϥΠϒϥϦ
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௨৴ɾඇಉظॲཧपΓ w 3FUSPpU w 0L)UUQ w 3Y+BWB
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௨৴ɾඇಉظॲཧपΓ .BJO"DUJWJUZ7JFX.PEFMLU UIJTDMJFOUHFU"DDPVOU CJOE5P-JGFDZDMF BDUJWJUZ TVCTDSJCF0O 4DIFEVMFSTOFX5ISFBE PCTFSWF0O "OESPJE4DIFEVMFSTNBJO5ISFBE TVCTDSJCF \TVDDFTT %PTPNFUIJOH ^ \GBJMVSF %PTPNFUIJOH ^ "QJLU JOUFSGBDF"QJ\ !(&5 BDDPVOU GVOHFU"DDPVOU 0CTFSWBCMF"DDPVOU ^
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1BSDFMFS 6TFS1SPpMFLU !1BSDFM EBUBDMBTT6TFS1SPpMF!1BSDFM$POTUSVDUPS DPOTUSVDUPS !1BSDFM1SPQFSUZ JDPO WBMJDPO4USJOH !1BSDFM1SPQFSUZ OBNF WBMOBNF4USJOH \ ^ w 1BSDFMBCMFͷ࣮Λָʹ͢ΔϥΠϒϥϦ
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1BSDFMFS 6TFS'SBHNFOULU 1BSDFMTVOXSBQ6TFS1SPpMF BSHVNFOUTHFU1BSDFMBCMF 4FSJBMJ[F,FZ64&3@130'*-&OBNF 6TFS'SBHNFOULU WBMBSHT#VOEMF BQQMZ\ QVU1BSDFMBCMF 4FSJBMJ[F,FZ64&3@1SPpMFOBNF 1BSDFMTXSBQ VTFS1SPpMF ^
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(40/ 6TFS1SPpMFLU EBUBDMBTT6TFS1SPpMF !4FSJBMJ[FE/BNF JDPO WBMJDPO4USJOH !4FSJBMJ[FE/BNF OBNF WBMOBNF4USJOH \ ^ w KTPOͷύʔεΛࣗಈԽ͢ΔϥΠϒϥϦ w ฐࣾͰQSPHVBSEରԠʹΞϊςʔγϣϯΛར༻ͯ͠ର Ԡ͍ͯ͠·͢ɻ
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%BSU w *OUFOUʹσʔλΛ͢ͷΛָʹ͢ΔϥΠϒϥϦ w ,&:ͷࢦఆ͕ෆཁʹͳΔ
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%BSU 6TFS"DUJWJUZLU DMBTT6TFS"DUJWJUZ"QQ$PNQBU"DUJWJUZ \ !*OKFDU&YUSB MBUFJOJUWBSVTFS6TFS PWFSSJEFGVOPO$SFBUF TBWFE*OTUBODF4UBUF#VOEMF \ TVQFSPO$SFBUF TBWFE*OTUBODF4UBUF %BSUJOKFDU UIJT ^ DPNQBOJPOPCKFDU\ GVODSFBUF*OUFOU DPOUFYU$POUFYU VTFS6TFS *OUFOU\ SFUVSO)FOTPOXJUI DPOUFYU HPUP6TFS"DUJWJUZ VTFS VTFS CVJME ^ ^ ^
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%BSUΛ'SBHNFOUͰར༻͢Δʁ 6TFS'SBHNFOULU HFU*OUFOU QVU&YUSBT )FOTPOXJUI UIJT HPUP.Z'SBHNFOU BSH BSH CVJME HFU4VQQPSU'SBHNFOU.BOBHFS CFHJO5SBOTBDUJPO SFQMBDF 3JEDPOUBJOFS OFX.Z'SBHNFOU DPNNJU w IUUQTHJUIVCDPNGQSBUFFLEBSUJTTVFTʮ୭͔པΉʯ w ࡌ͍ͬͯΔํ๏ඍົͳͷͰɺ'SBHNFOUͰར༻͍ͯ͠·ͤΜɻ
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BOESPJETUBUF w *DF1JDLͷ,PUMJOରԠ൛ʢFWFSOPUF͕։ൃʣ w PO4BWF*OTUBODF4UBUFͷॲཧΛࣗಈԽͯ͘͠ΕΔ w IUUQTHJUIVCDPNFWFSOPUFBOESPJETUBUF
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BOESPJETUBUF .BJO"DUJWJUZLU PWFSSJEFGVOPO$SFBUF TBWFE*OTUBODF4UBUF#VOEMF \ TVQFSPO$SFBUF TBWFE*OTUBODF4UBUF 4UBUF4BWFSSFTUPSF*OTUBODF4UBUF UIJT TBWFE*OTUBODF4UBUF ^ .BJO"DUJWJUZLU !4UBUF WBSOBNF4USJOH OVMM
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·ͱΊ w ͿΓʹ,PUMJOΛͬͯΈͨΒ͑ΔϥΠϒϥϦ͕͢͝ ͘૿͑ͯͯศརͩͬͨ w ,PUMJOͷجຊػೳ૬มΘΒͣૉఢ w ͜Ε͔Βͷ։ൃ,PUMJOͰ࢝ΊΔͷ͕ྑͦ͞͏ ͿΓʹͬͨΒͬͺΓ,PUMJOྑ͔ͬͨ
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גࣜձࣾNHSBNΤϯδχΞੵۃ࠾༻தͰ͢ɻ ਓͷΤϯδχΞΛ୳͍ͯ͠·͢ʂ ΤϯδχΞਓͰ͕Μ͍ͬͯ·͢ɻ ৽͍͠ͷେ͖ ࠊ͕ॏ͍