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Jetpack Compose でやってイイこと・ダメなこと
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カーキ
October 06, 2023
Technology
2
360
Jetpack Compose でやってイイこと・ダメなこと
mobile.stmn #2 (2023/10/6)
https://stmn.connpass.com/event/294182/
カーキ
October 06, 2023
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Transcript
+FUQBDL$PNQPTFͰͬͯ ΧʔΩ!NPCJMFTUNOʢʣ μϝͳ͜ͱ🙅 ΠΠ͜ͱ🙆
ϓϩϑΟʔϧ Name = “ΧʔΩ” BelongTo = “גࣜձࣾελϝϯ/ϞόΠϧΞϓϦG” Work = “Android
App Engineer” Twitter = “@khaki_ngy” Fav = listOf(“🎞”, “🍳”) / / TODO:ӡӦΛ͍ͯ͠ΔίϛϡχςΟͷΠϕϯτͷհΛ͢Δ Organization = “Liven up NAGOYA”
ࠓ͢͜ͱ 1 . Jetpack Compose Recomposition 2 . 3 .
4 .
+FUQBDL$PNQPTFૉΒ͍͠👏
+FUQBDL$PNQPTFͷྑ͍ͱ͜Ζ❤ UI AndroidView AndroidView Composable Google
+FUQBDL$PNQPTFͷؾʹͳΔͱ͜Ζ👀 Recomposition AndroidView UI Recomposition • ඳըࡁΈͷը໘͕࠶ඳը͞ΕΔ͜ͱ • ࠶ඳըࣗମʹͳ͍ •
ҙਤ͠ͳ͍λΠϛϯάͰRecomposition͕ൃੜͯ͠͠·͏ͱύϑΥʔϚϯεͷԼʹܨ͕Δ
ҙਤ͠ͳ͍ 3FDPNQPTJUJPOΛ͑Δϧʔϧ ࠓ͢͜ͱ
ܕͷ҆ఆੑฤ
ܕͷ҆ఆੑʹ͍ͭͯ ܕͷʮ҆ఆʯʮෆ҆ఆʯ Composable Recomposition Ҿʹ༩͑Δܕ͕҆ఆͳͷ͔ෆ҆ఆͳͷ͔ΛΔඞཁ͕͋Δ
🙆ͬͯΠΠ͜ͱ $PNQPTBCMFؔͷύϥϝʔλʹϓ ϦϛςΟϒܕΛ͏
🙆ΠΠͶ $PNQPTBCMFؔͷύϥϝʔλʹϓϦϛςΟϒܕΛ͏ Recomposition 👍
🙅ͬͯμϝͳ͜ͱ $PNQPTBCMFؔͷύϥϝʔλʹί ϨΫγϣϯܕ -JTU 4FU Λ͏
🙅ؾΛ͚ͭͯ $PNQPTBCMFؔͷύϥϝʔλʹίϨΫγϣϯܕ -JTU 4FU Λ͏ items Recomposition
🙆ͬͯΠΠ͜ͱ *NNVUBCMF-JTUΛར༻͢Δ
🙆ΠΠͶ *NNVUBCMF-JTUΛར༻͢Δ kotlinx.collections.immutable Immutable Collection ImmutableList/ImmutableSet/ImmutableMap
🙅ͬͯμϝͳ͜ͱ ҾʹඇσʔλΫϥεΛར༻͢Δ
🙅ؾΛ͚ͭͯ ҾʹඇσʔλΫϥεΛར༻͢Δ Recomposition
🙆ͬͯΠΠ͜ͱ ίϨΫγϣϯܕΛϥοϓͨ͠Ϋϥεʹ !*NNVUBCMFΞϊςʔγϣϯΛ͚Δ
🙆ΠΠͶ ίϨΫγϣϯܕΛϥοϓͨ͠Ϋϥεʹ!*NNVUBCMFΞϊςʔγϣϯΛ͚Δ Collection @Immutable Items
🙆ͬͯΠΠ͜ͱ ఆͷΈͰߏ͞ΕͨσʔλΫϥε Λར༻͢Δ
🙆ΠΠͶ ఆͷΈͰߏ͞ΕͨσʔλΫϥεΛར༻͢Δ @Immutable
Πϯελϯεੜ
Πϯελϯεੜͷίετ $PNQPTBCMFؔͰͷҙ Composable Composable
🙅ͬͯμϝͳ͜ͱ $PNQPTBCMFؔͷείʔϓͰΠϯ ελϯεΛੜ͢Δ
🙅ؾΛ͚ͭͯ $PNQPTBCMFؔͷείʔϓͰΠϯελϯεΛੜ͢Δ Widget Recomposition Title Title() Composable Recomposition
🙆ͬͯΠΠ͜ͱ ΠϯελϯεੜʹSFNFNCFSΛ ར༻͢Δ
🙆ΠΠͶ ΠϯελϯεੜʹSFNFNCFSΛར༻͢Δ Remember Composition
🙆ͬͯΠΠ͜ͱ SFNFNCFSͷΩʔΛར༻͢Δ
🙆ΠΠͶ SFNFNCFSͷΩʔΛར༻͢Δ remember key
🤷͜ΕͲ͏ʁ SFNFNCFSͷΩʔΛར༻͢Δ Remember Recomposition
🙆ͬͯΠΠ͜ͱ EFSJWFE4UBUF0GΛར༻͢Δ
🙆ΠΠͶ EFSJWFE4UBUF0GΛར༻͢Δ derivedStateOf textColor Recomposition
🤷ཹҙ 3FDPNQPTJUJPOʹහײʹͳΓա͗ͳ͍ Recomposition
3FDPNQPTJUJPOΛݟۃΊΔ🕵
3FDPNQPTJUJPOΛݟۃΊΔํ๏ 1 . Layout Inspector Recomposition 2 . recomposeHighlighter
-BZPVU*OTQFDUPS 3FDPNQPTJUJPOͷݸΛදࣔͰ͖Δʂ
-BZPVU*OTQFDUPSͰ֬ೝ͢Δ্Ͱͷҙ Gira ff e minify false Show Recomposition Counts
SFDPNQPTF)JHIMJHIUFSΛ͏ Google Github Modi fi er Composable Modi fi er
Recomposition
·ͱΊ
ࠓͷ·ͱΊ Jetpack Compose Recomposition Recomposition 領 Recomposition