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Flutterでキャッチしないエラーはどこに行く
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AOKI Taiju
September 03, 2025
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Flutterでキャッチしないエラーはどこに行く
Flutter Tokyo #10 登壇資料
AOKI Taiju
September 03, 2025
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Transcript
੨େथ 'MVUUFSͰΩϟον͠ͳ͍Τϥʔ Ͳ͜ʹߦ͘ 'MVUUFS5PLZP
ۙӨ w ੨େथʢ͓͖͍͋ͨ͡Ύʣ w ձࣾһ w 'MVUUFSͱ͔Β৮ͬͨΓ ΕͨΓͬͨΓΏΔ͍͖߹͍ ࣗݾհ
͜ͷͷత w 'MVUUFSΞϓϦશମʹର͢ΔجຊతͳΤϥʔϋϯυϦϯάํ๏Λཧղ͢Δ w ެࣜʹ΄΅·ͱ·ͬͯΔ͚ͲɺใΛ͚ͭͭ͠ཧ͢Δ w ެࣜIUUQTEPDT fl VUUFSEFWUFTUJOHFSSPST w
͍ը໘ͬͯ୭͕ग़ͯ͠ΔΜͩΖ͏ʁͱ͍͏ɺ͔ͭͯͷࣗͷٙʹ͑Δ
͜͜Ͱݴ͏ʮΩϟον͠ͳ͍Τϥʔʯͱ w ͬ͘͟Γɺ'MVUUFSΞϓϦ։ൃऀ͕ ΤϥʔϋϯυϦϯά͍ͯ͠ͳ͍Τϥʔ w ˞&SSPSΫϥεʹݶͬͨͰͳ͘ɺΑΓ ٛͷҙຯͰͷΤϥʔͰ͢
͜͜Ͱݴ͏ʮΩϟον͠ͳ͍Τϥʔʯͱ w ͜͏͍͏ͭΒ👉
Ωϟον͠ͳ͍ΤϥʔͲ͜ʹߦ͘ʁͷ݁ w 'MVUUFSϑϨʔϜϫʔΫ͕Ωϟον͢ΔΤϥʔ w ˠ'MVUUFS&SSPSPO&SSPSʹྲྀΕΔ w 'MVUUFSϑϨʔϜϫʔΫ͕Ωϟον͠ͳ͍Τϥʔ w ˠ1MBUGPSN%JTQBUDIFSJOTUBODFPO&SSPSʹྲྀΕΔ
'MVUUFSϑϨʔϜϫʔΫ͕Ωϟον ͢ΔΤϥʔ
ରͷΤϥʔ w ϏϧυɺϨΠΞτɺϖΠϯτͷ֤ϑΣʔζͰൃ ੜͨ͠ΤϥʔͳͲɺ'MVUUFSϑϨʔϜϫʔΫࣗମʹ ΑͬͯτϦΨʔ͞ΕΔίʔϧόοΫதʹൃੜ͢Δ Τϥʔ w ྫ w JOJU4UBUFͳͲ8JEHFUϥΠϑαΠΫϧʹԠͨ͡
ίʔϧόοΫͰͷྫ֎ w CVJMEϝιουͰͷྫ֎ w "3FOEFS'MFYPWFS fl PXFEʜ
Ͳ͜ʹߦ͘ w 'MVUUFS&SSPSPO&SSPSʹདྷΔͷͰ͜ͷίʔϧόο ΫΛઃఆ͢Δ͜ͱͰϋϯυϦϯάͰ͖Δ w σϑΥϧτͩͱ 'MVUUFS&SSPSPO&SSPS ೖՄ ˣ
'MVUUFS&SSPSQSFTFOU&SSPS ೖՄ ˣ 'MVUUFS&SSPSEVNQ&SSPS5P$POTPMF ͷݺͼग़͠ w 'MVUUFSϑϨʔϜϫʔΫ͕Ωϟον͢ΔΤϥʔͰ͋ Ε'MVUUFS&SSPSPO&SSPSݺΕΔ͕ɺΤϥʔͷ छྨɺϞʔυʹΑͬͯදࣔʹࠩҟ͕͋Δ
ϏϧυϑΣʔζͷΤϥʔ w %FCVHϞʔυͷ߹͍ը໘ʹϝοηʔ δ w 3FMFBTFɺ1SP fi MFͷ߹փ৭ͷը໘ʹϝ οηʔδͳ͠ w
௨শlࢮͷʢPSփ৭ʣը໘z w SFE PSHSFZ TDSFFOPGEFBUIz
ϏϧυϑΣʔζͷΤϥʔ w փ৭ͷը໘&SSPS8JEHFU͕ද͍ࣔͯ͠Δ w &SSPS8JEHFU෦Ͱ3FOEFS&SSPS#PYʹґଘ͓ͯ͠Γɺ 3FOEFS&SSPS#PYͷ࣮ʹ۩ମతͳ৭ͷࢦఆ͕͋Δ w IUUQTHJUIVCDPN fl VUUFS
fl VUUFSCMPC DDEB ff CFBBGCEGEE QBDLBHFT fl VUUFSMJCTSDSFOEFSJOHFSSPSEBSU- w &SSPS8JEHFUCVJMEFSΛઃఆ͢Δ͜ͱͰද্͕ࣔॻ͖Ͱ͖Δ w ՄೳͳݶΓ࠷খݶͷ࡞ۀΛ͢Δ͜ͱ͕ਪ͞Ε͍ͯΔɻ -FBG3FOEFS0CKFDU8JEHFU͕࠷దͱͷ͜ͱ w ௨ৗɺ&SSPS8JEHFUCVJMEFS͕ݺͼग़͞ΕΔલʹ 'MVUUFS&SSPSPO&SSPS͕ݺΕΔΒ͍͠
"3FOEFS'MFYPWFSGMPXFEʜ w %FCVHͩͱࠇͱԫ৭ͷࣶʑ͕දࣔ w 3FMFBTFͩͱ୯ʹΈग़ͨ෦͕ දࣔ͞Εͳ͍͚ͩ w ͜ͷࣶʑ %FCVH0WFS fl
PX*OEJDBUPS.JYJOͰ ࣮͞Εͯͦ͏ w ʢΧελϚΠζํ๏Θ͔ͬͯ ͍ͳ͍͕धཁͳ͍͔ʣ
*NBHF8JEHFUͷը૾ಡΈࠐΈࣦഊ w %FCVHͩͱ͍ઢͷϘοΫε͕ දࣔ͞ΕΔ w 3FMFBTFͩͱτϧπϝ͞ΕΔ w ίϯετϥΫλʹFSSPS#VJMEFS Λࢦఆ͢Δ͜ͱͰΧελϚΠζ Մೳ
ͦͷଞ w ଞʹ3FOEFS#PYXBTOPUMBJEPVU *ODPSSFDUVTFPG1BSFOU%BUBXJEHFUͳͲ ಛผͳΤϥʔදࣔͳ͍͕ 'MVUUFS&SSPSPO&SSPSݺΕΔ w ࣗͷ࣮Ͱ'MVUUFS&SSPSPO&SSPSʹΤϥʔ Λྲྀ͍ͨ͠߹ɺ'MVUUFS&SSPSSFQPSU&SSPS ΛݺͿ
w ͜͜Ͱݴ͏ʮ'MVUUFSϑϨʔϜϫʔΫ͕Ωϟο ν͢ΔΤϥʔʯɺ 'MVUUFS&SSPSSFQPSU&SSPSͰॲཧ͞ΕΔΤϥ ʔͱݴ͍͍͍͔͑ͯ͠Εͳ͍ ίʔυҾ༻ݩIUUQTBQJ fl VUUFSEFW fl VUUFSGPVOEBUJPO'MVUUFS&SSPSSFQPSU&SSPSIUNM
'MVUUFSϑϨʔϜϫʔΫ͕Ωϟον ͠ͳ͍Τϥʔ
ରͷΤϥʔ w ެࣜͰʮ'MVUUFSͷίʔϧόοΫͰൃੜ͠ͳ ͍ΤϥʔʯʮίʔϧελοΫʹ'MVUUFSίʔϧό οΫ͕ͳ͍ঢ়ଶͰΤϥʔʯʮϧʔτJTPMBUFͰະ ॲཧͷΤϥʔʯͳͲදݱ͞Ε͍ͯΔ w ྫ w ඇಉظͷΤϥʔ
w λΠϚʔͷίʔϧόοΫͰͷΤϥʔ w .FUIPE$BOOFMݺͼग़͠ͰͷΤϥʔ
Ͳ͜ʹߦ͘ w 1MBUGPSN%JTQBUDIFSJOTUBODFP O&SSPSʹདྷΔͷͰ͜ͷίʔϧόο ΫΛઃఆ͢Δ͜ͱͰϋϯυϦϯάͰ ͖Δ w ΤϥʔΛॲཧͨ͠ΒUSVFΛฦ͢ w GBMTFΛฦͨ͠߹ɺϓϥοτϑΥʔ
Ϝ͝ͱඪ४Τϥʔग़ྗͷग़ྗͳͲ ʹϑΥʔϧόοΫ͞ΕΔ
PO&SSPSະઃఆͷ߹ͷڍಈ w ίϯιʔϧʹΤϥʔ༰͕ग़ྗ͞ΕΔͷΈ w ಈ࡞ΛݟΔݶΓɺPO&SSPSΛઃఆͭͭ͠GBMTFΛฦ͢߹ͱಉ༷ͱࢥΘΕΔ
·ͱΊ ओͳΤϥʔίʔϧόοΫ ༻్ Կઃఆ͠ͳ͍߹ ҰൠతͳϓϥΫςΟε 'MVUUFS&SSPSPO&SSPS 'MVUUFSϑϨʔϜϫʔΫ͕Ω ϟονͨ͠ΤϥʔΛัଊ ͠ɺॲཧ͢Δ Τϥʔ༰ͷίϯιʔϧग़ྗ
˞Τϥʔ༰NPEFʹΑΔ ΤϥʔΛग़ྗͭͭ͠όοΫ ΤϯυͷαʔϏεʹΤϥʔ Λૹ৴͢Δ 1MBUGPSN%JTQBUDIFSJOTUBO DFPO&SSPS 'MVUUFSϑϨʔϜϫʔΫ͕Ω ϟον͠ͳ͔ͬͨΤϥʔΛ ัଊ͠ɺॲཧ͢Δ Τϥʔ༰ͷίϯιʔϧग़ྗ ΤϥʔΛग़ྗͭͭ͠όοΫ ΤϯυͷαʔϏεʹΤϥʔ Λૹ৴͢Δ &SSPS8JEHFUCVJMEFS ϏϧυϑΣʔζͰͷΤϥʔൃ ੜ࣌ͷը໘දࣔ༰ΛΧε λϚΠζ͢Δ ͍ը໘ʢEFCVHʣ փ৭ը໘ʢSFMFBTFʣ ઃఆ͢Δ߹ɺՄೳͳݶΓ ࠷খݶͷ࡞ۀ༰ʹ͢Δɻ -FBG3FOEFS0CKFDU8JEHFU ͕࠷దͱͷ͜ͱ
ՃͰਂ۷ΔͳΒ w SVO;POFE(VBSEFE w ғͬͨॲཧͷதͰൃੜͨ͠ΤϥʔʢඇಉظॲཧͷΤϥʔΛؚΉʣΛัଊ͠ ॲཧͰ͖Δଞɺ͞·͟·ͳ༻్͕͋Γͦ͏ w ࢠJTPMBUFͰΤϥʔ͕ൃੜͨ͠߹ͷϋϯυϦϯά w ࢠJTPMBUFͷΤϥʔͰ1MBUGPSN%JTQBUDIFSJOTUBODFPO&SSPS͕ݺ
ΕΔ͜ͱͳ͍ͨΊɺϧʔτJTPMBUFʹΤϥʔΛసૹ͢Δඞཁ͕͋ΔΒ͍͠
ࢀߟจݙ w )BOEMJOHFSSPSTJO'MVUUFS w IUUQTEPDT fl VUUFSEFWUFTUJOHFSSPST w 'MVUUFS&SSPS DMBTT
w IUUQTBQJ fl VUUFSEFW fl VUUFSGPVOEBUJPO'MVUUFS&SSPSDMBTTIUNM w &SSPS8JEHFU DMBTT w IUUQTBQJ fl VUUFSEFW fl VUUFSXJEHFUT&SSPS8JEHFUDMBTTIUNM w "(VJEFUP'MVUUFSFSSPSIBOEMJOH w IUUQTXXXZPVUVCFDPNXBUDI W.W:,*QX.&
͋Γ͕ͱ͏͍͟͝·ͨ͠👋