CustomView in Kotlin @ potatotips #42

$VTUPN7JFXJO,PUMJO :PTIJIJSP8BEBBLB!FEPLVQ QPUBUPUJQT!$PPLQBE *OD

୭΍ͶΜ͓લ :PTIJIJSP8BEB Ɠ $ZCFS"HFOU *OD "EUFDI4UVEJP"*.FTTFOHFS !FEPLVQ ȍ
FEPLVQ FEPLVQ ,PUMJO ྺ ϲ݄

,PUMJO ྺ ϲ݄ ୭΍ͶΜ͓લ :PTIJIJSP8BEB Ɠ $ZCFS"HFOU *OD
"EUFDI4UVEJP"*.FTTFOHFS !FEPLVQ ȍ FEPLVQ FEPLVQ

ࠓճ࿩͢͜ͱ ⋆ ,PUMJO Ͱ $VTUPN7JFX Λ࡞੒͢Δ ? ίϯετϥΫλ͸Ͳ͏ͳΔʜʁ ?
+BWB ͔ΒݺͿࡍʹ͸ʜʁ ? $BMMCBDL ͸Ͳ͏͢Ε͹ʜʁ

$POTUSVDUPS QVCMJDDMBTT$VTUPN7JFXFYUFOET7JFX\ QVCMJD$VTUPN7JFX $POUFYUDPOUFYU \ TVQFS DPOUFYU JOJU
^ QVCMJD$VTUPN7JFX $POUFYUDPOUFYU !/VMMBCMF"UUSJCVUF4FUBUUST \ TVQFS DPOUFYU BUUST JOJU ^ QVCMJD$VTUPN7JFX $POUFYUDPOUFYU !/VMMBCMF"UUSJCVUF4FUBUUST JOUEFG4UZMF"UUS \ TVQFS DPOUFYU BUUST EFG4UZMF"UUS JOJU ^ QSJWBUFWPJEJOJU \ JOJUJBMJ[F ^ NFUIPET ^ ⋆ ී௨ͷ $POTUSVDUPS

$POTUSVDUPS DMBTT$VTUPN7JFX7JFX\ DPOTUSVDUPS DPOUFYU$POUFYU TVQFS DPOUFYU DPOTUSVDUPS
DPOUFYU$POUFYU BUUST"UUSJCVUF4FU TVQFS DPOUFYU BUUST DPOTUSVDUPS DPOUFYU$POUFYU BUUST"UUSJCVUF4FU EFG4UZMF"UUS*OU TVQFS DPOUFYU BUUST EFG4UZMF"UUS JOJU\ JOJUJBMJ[F ^ NFUIPET ^ ⋆ ,PUMJO Ͱ JOJU ϒϩοΫΛ࢖ͬͯΈΔ TFDPOEFSZ DPOTUSVDUPST

$POTUSVDUPS DMBTT$VTUPN7JFX!+WN0WFSMPBETDPOTUSVDUPS DPOUFYU$POUFYU BUUST"UUSJCVUF4FU OVMM EFG4UZMF"UUS*OU 7JFX DPOUFYU
BUUST EFG4UZMF"UUS \ JOJU\ JOJUJBMJ[F ^ NFUIPET ^ ⋆ σϑΥϧτҾ਺Λ࢖ͬͯΈΔ QSJNBSZ DPOTUSVDUPS

!+WN0WFSMPBET Ξϊςʔγϣϯ ⋆ +BWB ༻ͷ 0WFSMPBENFUIPE Λ࡞ͬͯ͘ΕΔ +BWB ͔Β͸σϑΥϧτҾ਺͸ࢀরͰ͖ͳ͍ɻ
/P4VDI.FUIPE&YDFQUJPO Λు͔ΕΔ !+WN0WFSMPBETΞϊςʔγϣϯΛ௥Ճ͢Δͱ +BWB ͔Βݟͨͱ͖ʹϝιου͕ଟॏఆٛ͞ΕΔ ,PUMJO ͔Β "OESPJE4UVEJP ͷ *OUFOTJPO Ͱ !+WN0WFSMPBET ͳίϯετϥΫλΛ ࡞ͬͯ͘ΕΔΑ͏ʹ "EE"OESPJE7JFXDPOTUSVDUPSTVTJOH!+WN0WFSMPBET

$BMMCBDL QVCMJDDMBTT-JTUFOFS4BNQMF7JFXFYUFOET7JFX\ QSJWBUF$BMMCBDLDBMMCBDL QVCMJDWPJEIPHF \ JG DBMMCBDLOVMM SFUVSO DBMMCBDLPO)PHF
^ QVCMJDJOUFSGBDF$BMMCBDL\ QVCMJDWPJEPO)PHF ^ ^ QVCMJDDMBTT.BJO"DUJWJUZFYUFOET"QQ$PNQBU"DUJWJUZ JNQMFNFOUT-JTUFOFS4BNQMF7JFX$BMM#BDL\ !0WFSSJEF QVCMJDWPJEPO)PHF \ DBMMCBDLT ^ ^ ⋆ ී௨ͷϦεφʔύλʔϯ

$BMMCBDL DMBTT-JTUFOFS4BNQMF7JFX7JFX\ QSJWBUFWBSDBMMCBDL$BMMCBDL OVMM QSJWBUFGVOIPHF \ DBMMCBDL PO)PHF TBGFDBMM
^ JOUFSGBDF$BMMCBDL\ GVOPO)PHF ^ ^ DMBTT.BJO"DUJWJUZ"QQ$PNQBU"DUJWJUZ -JTUFOFS4BNQMF7JFX$BMMCBDL\ PWFSSJEFGVOPO)PHF \ DBMMCBDLT ^ ^ ⋆ ͦͷ·· ,PUMJO ʹͯ͠ΈΔ

$BMMCBDL DMBTT-JTUFOFS4BNQMF7JFX7JFX\ 㕉ᡔә◌क✖ԒԾԠԏԗ԰ӔӘӑӇӘӨӨՉ՛ԸӕᛝӉӅӳӶӵ WBSPO)PHF 6OJU OVMM QSJWBUFGVOIPHF \
PO)PHF JOWPLF ^ ^ DMBTT.BJO"DUJWJUZ"QQ$PNQBU"DUJWJUZ \ PWFSSJEFGVOPO$SFBUF TBWFE*OTUBODF4UBUF#VOEMF \ MJTUFOFS4BNQMF7JFXPO)PHF\ DBMMCBDLT ^ ^ ^ ⋆ ؔ਺Ϧςϥϧͱ JOWPLF Ͱ -JTUFOFS ͕ෆཁʹ

$BMMCBDL QVCMJDDMBTT+BWB.BJO"DUJWJUZFYUFOET"QQ$PNQBU"DUJWJUZ\ !0WFSSJEF QSPUFDUFEWPJEPO$SFBUF !/VMMBCMF#VOEMFTBWFE*OTUBODF4UBUF \
MJTUFOFS4BNQMF7JFXTFU0O)PHF OFX'VODUJPO6OJU \ !0WFSSJEF QVCMJD6OJUJOWPLF \ DBMMCBDLT SFUVSOOVMM ^ ^ ^ ^ ⋆ +BWB Ͱѻ͏ͱ͖͸ 'VODUJPO/ ΛҾ਺ʹ༩͑Δ 'VODUJPO/ 㮢/ әᐠᡔӘંᡔ㮣 ୤ә ,PUMJO Ә㕉ᡔѭ 6OJU ӔӴ OVMM Ӽ㈘Ӄ

$BMMCBDL ⋆ Ҿ਺͕ଟ͘ͳͬͨͱ͖Λߟ͑Δ ⋆ ֦େɾॖখɾεΫϩʔϧͰ͖Δ *NBHF7JFX Ͱഒ཰΍࠲ඪɺ͸Έग़͠஋౳Λ௨஌ͯ͠΄͍͠ WBSPO$IBOHF4UBUF
TDBMF'MPBU Y'MPBU Z'MPBU PWFS9*OU PWFS:*OU 6OJU OVMM

$BMMCBDL ⋆ +BWB ίʔυͰ͸ඇৗʹ௕͍ 'VODUJPO ʹͳΔ ⋆ ิ׬Ͱࣗಈੜ੒͢ΔͱҾ਺໊͕Ṗ IPHF7JFXTFU0O$IBOHF4UBUF
OFX'VODUJPO'MPBU 'MPBU 'MPBU *OUFHFS *OUFHFS 6OJU \ !0WFSSJEF QVCMJD6OJUJOWPLF 'MPBUB'MPBU 'MPBUB'MPBU 'MPBUB'MPBU *OUFHFSJOUFHFS *OUFHFSJOUFHFS \ SFUVSOOVMM ^ ^ ⧞௻ӑᥨҷᝪҲӵӘәǘ

$BMMCBDL IPHF7JFXPO$IBOHF4UBUF\ 䖕 GM'MPBU GM'MPBU GM'MPBU
J*OU J*OU\⧞ಌ⇰ᘻҿӶӉᐠᡔൻ GVODUJPOT ^ ^ ⋆ ,PUMJO Ͱ΋ *OUFOTJPO ͨ࣌͠ͷҾ਺໊͕ʜ +BWB ӘӒҷӲӴ㗾ӕӔӍӉǘ㮹

$BMMCBDL ʹ͍ͭͯࢥ͏͜ͱ ⋆ ؔ਺ϦςϥϧͰϦεφʔύλʔϯഉআ͸Ͱ͖Δ ⋆ ϦεφʔύλʔϯΛ࢖ͬͨ΄͏͕ϝϯςφϯε ͠΍͍͢έʔε͸͍ͬͺ͍͋Γͦ͏ ෳ਺ͷҾ਺͕ଘࡏ͢Δͱ͖ ଟ਺ͷίʔϧόοΫؔ਺Λ࣋ͭͱ͖
⋆ ٯʹར༻ͨ͠ํ͕ྑͦ͞͏ͳέʔε΋͋Γͦ͏ ඞͣఆٛ͢Δඞཁͷͳ͍ίʔϧόοΫ͕͋Δ࣌ FH(FTUVSF%FUFDUPS(FTUVSF-JTUFOFS ͷ಺ μϒϧλοϓͷݕ஌͚ͩར༻͍ͨ͠ɺͱ͔

ࢀߟจݙ ⋆ +BWB ͔Βͷར༻Λࢹ໺ʹೖΕͨ ,PUMJO ίʔυͰ ԿΛ͢Δ΂͖͔2JJUB IUUQRJJUBDPNKNBUTVJUFNTDCBBDCDCG ⋆
+BWB,PUMJO ࠞ߹ϓϩδΣΫτͰؾΛ͚͍ͭͯΔ͜ͱɻ IUUQMWMBIBUFOBCMPHDPNFOUSZ ⋆ ,PUMJO ͰίʔϧόοΫ2JJUB IUUQRJJUBDPN""LJSB!HJUIVCJUFNTFCBBFFECED

CustomView in Kotlin @ potatotips #42

CustomView in Kotlin @ potatotips #42

Yoshihiro WADA

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$VTUPN7JFXJO,PUMJO :PTIJIJSP8BEBBLB!FEPLVQ QPUBUPUJQT!$PPLQBE *OD

୭΍ͶΜ͓લ :PTIJIJSP8BEB Ɠ $ZCFS"HFOU OD "EUFDI4UVEJP".FTTFOHFS !FEPLVQ ȍ

,PUMJO ྺ ϲ݄ ୭΍ͶΜ͓લ :PTIJIJSP8BEB Ɠ $ZCFS"HFOU *OD

ࠓճ࿩͢͜ͱ ⋆ ,PUMJO Ͱ $VTUPN7JFX Λ࡞੒͢Δ ? ίϯετϥΫλ͸Ͳ͏ͳΔʜʁ ?

$POTUSVDUPS QVCMJDDMBTT$VTUPN7JFXFYUFOET7JFX\ QVCMJD$VTUPN7JFX $POUFYUDPOUFYU \ TVQFS DPOUFYU JOJU

$POTUSVDUPS DMBTT$VTUPN7JFX7JFX\ DPOTUSVDUPS DPOUFYU$POUFYU TVQFS DPOUFYU DPOTUSVDUPS

$POTUSVDUPS DMBTT$VTUPN7JFX!+WN0WFSMPBETDPOTUSVDUPS DPOUFYU$POUFYU BUUST"UUSJCVUF4FU OVMM EFG4UZMF"UUS*OU 7JFX DPOUFYU

$POTUSVDUPS DMBTT$VTUPN7JFX!+WN0WFSMPBETDPOTUSVDUPS DPOUFYU$POUFYU BUUST"UUSJCVUF4FU OVMM EFG4UZMF"UUS*OU 7JFX DPOUFYU

!+WN0WFSMPBET Ξϊςʔγϣϯ ⋆ +BWB ༻ͷ 0WFSMPBENFUIPE Λ࡞ͬͯ͘ΕΔ +BWB ͔Β͸σϑΥϧτҾ਺͸ࢀরͰ͖ͳ͍ɻ

$BMMCBDL QVCMJDDMBTT-JTUFOFS4BNQMF7JFXFYUFOET7JFX\ QSJWBUF$BMMCBDLDBMMCBDL QVCMJDWPJEIPHF \ JG DBMMCBDLOVMM SFUVSO DBMMCBDLPO)PHF

$BMMCBDL DMBTT-JTUFOFS4BNQMF7JFX7JFX\ QSJWBUFWBSDBMMCBDL$BMMCBDL OVMM QSJWBUFGVOIPHF \ DBMMCBDL PO)PHF TBGFDBMM

$BMMCBDL DMBTT-JTUFOFS4BNQMF7JFX7JFX\ 㕉ᡔә◌क✖ԒԾԠԏԗ԰ӔӘӑӇӘӨӨՉ՛ԸӕᛝӉӅӳӶӵ WBSPO)PHF 6OJU OVMM QSJWBUFGVOIPHF \

$BMMCBDL QVCMJDDMBTT+BWB.BJO"DUJWJUZFYUFOET"QQ$PNQBU"DUJWJUZ\ !0WFSSJEF QSPUFDUFEWPJEPO$SFBUF !/VMMBCMF#VOEMFTBWFE*OTUBODF4UBUF \

$BMMCBDL ⋆ Ҿ਺͕ଟ͘ͳͬͨͱ͖Λߟ͑Δ ⋆ ֦େɾॖখɾεΫϩʔϧͰ͖Δ *NBHF7JFX Ͱഒ཰΍࠲ඪɺ͸Έग़͠஋౳Λ௨஌ͯ͠΄͍͠ WBSPO$IBOHF4UBUF

$BMMCBDL ⋆ +BWB ίʔυͰ͸ඇৗʹ௕͍ 'VODUJPO ʹͳΔ ⋆ ิ׬Ͱࣗಈੜ੒͢ΔͱҾ਺໊͕Ṗ IPHF7JFXTFU0O$IBOHF4UBUF

$BMMCBDL IPHF7JFXPO$IBOHF4UBUF\ 䖕 GM'MPBU GM'MPBU GM'MPBU

$BMMCBDL ʹ͍ͭͯࢥ͏͜ͱ ⋆ ؔ਺ϦςϥϧͰϦεφʔύλʔϯഉআ͸Ͱ͖Δ ⋆ ϦεφʔύλʔϯΛ࢖ͬͨ΄͏͕ϝϯςφϯε ͠΍͍͢έʔε͸͍ͬͺ͍͋Γͦ͏ ෳ਺ͷҾ਺͕ଘࡏ͢Δͱ͖ ଟ਺ͷίʔϧόοΫؔ਺Λ࣋ͭͱ͖

ࢀߟจݙ ⋆ +BWB ͔Βͷར༻Λࢹ໺ʹೖΕͨ ,PUMJO ίʔυͰ ԿΛ͢Δ΂͖͔2JJUB IUUQRJJUBDPNKNBUTVJUFNTDCBBDCDCG ⋆