気になったセッションから今すぐ開発に導入したいあれこれ（主観

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1. Android Dev Summit2019ใࠂձ ؾʹͳͬͨηογϣϯ͔Βɺ ࠓ͙͢ϓϩμΫτ։ൃʹಋೖ͍ͨ͋͠Ε͜Ε @kobashinG ʢ͜͹͠Μʣ 2019.11.07
2. ࣗݾ঺հ ͜͹͠Μ (@kobashinG) ๭ࣾͰECαʔϏε (AndroidΞϓϦ୲౰)΍ͬͯ·͢ ϑϩϯτΤϯυશൠ, etc… Android, Linux, k8s,
3. ࠓ೔ͷ͓඼ॻ͖ • ࢹௌͨ͠ηογϣϯ • VitalsΛΧελϚΠζ͍ͯ͜͠͏ • ProfilerͰϝϞϦϦʔΫͱରቂ͢Δ • JetpackҠߦ͸͓ࡁΈͰ͔͢ʁ • ͍ͬͺ͍͓࿩͍ͨ͠ͷͰɺͦͷଞ͸௚઀͓࿩͠·͠ΐ
4. ࠓ೔ͷࢿྉ͸ͪ͜Βʹࣄલެ։͍ͯ͠·͢ ⬇ http://ow.ly/kUmN50x4vv9
5. ࢹௌͨ͠ηογϣϯ • Keynote • What’s New in Android Studio • LiveData with Coroutine Flow • Fragments Past / Future • Androidx Webkit • Going Edge to Edge with Gesture Navigation • Supercharge Sharing to your App • Migrate to Androidx: The time is right • Debugging Tips and n’Tricks • Performance Myth Busters • Demystify the Data 
 in Android Studio Profilers • Monitoring and Improving 
 Real-World Stability and Performance • Fragments Past / Future • Performance Analysis Using Systrace
6. Some Topics
7. ࠓ͙͢ϓϩμΫτʹ͍Ε͍ͨػೳͨͪ • Edge to Edge navigationͷNavigation Conflict
8. ࠓ͙͢ϓϩμΫτʹ͍Ε͍ͨػೳͨͪ • Share SheetΛ֦ு͢Δʂ
9. ࠓ͙͢ϓϩμΫτʹ͍Ε͍ͨػೳͨͪ • Fragment Factory
10. Monitoring and Improving 
 Real-World Stability and Performance Android Vitals׆༻ͯ͠·͔͢ʁ https://youtu.be/mXzy0NX9bSM
11. Android Vitalsʁ • ΞϓϦͷ҆ఆੑɾύϑΥʔϚϯ εΛ޲্͢ΔͨΊͷࢦඪΛఏڙ ͯ͘͠ΕΔ
12. Core Vitals • ϢʔβʔମݧʹӨڹ͠΍͍͢ࢦඪΛՄࢹԽ • ಛʹॏཁͳࢦඪ͸ • Crash Rate • ANR Rate • Battery • Wakelock / Wakeup
13. Core Vitals • ڐ༰Ͱ͖Δ͖͍͠஋Λઃఆͯ͘͠Ε͍ͯΔ • Core Vitalsͷ஋͸Play Store಺ͷݕࡧείΞ౳ʹӨڹ͢Δ
14. Crash Rate ղੳʹศརͳϑΟϧλ͕༻ ҙ͞ΕͯΔ ྨࣅΞϓϦͱͷൺֱ
15. Crash Rate ΞϓϦ໊΍ొ࿥৘ใ͔ΒࣗಈͰྨࣅ ΞϓϦΛબΜͰ͘Ε͍ͯΔɻ ଟগζϨ͍ͯΔ͜ͱ΋͋ΔͷͰɺ νϡʔχϯά͓͖ͯ͠·͠ΐ͏
16. Core Vitals ৴པ۠ؒΛදࣔ͢ΔͱΏ Ε΋֬ೝͰ͖Δ ͍͔ͭΒ͖͍͠஋Λ௒͑ ͨͷ͔Λ֬ೝͰ͖Δ
17. Core Vitals ͜ΕΒͰ֬ೝͰ͖Δ • ΞϓϦόʔδϣϯ • OSόʔδϣϯ • σόΠε
18. Core Vitals ໰୊͕ൃੜ͍ͯ͠Ε͹ ௨஌ͯ͘͠ΕΔ ௨஌ઃఆ͢Ε͹ϝʔϧ ड৴΋Ͱ͖Δ
19. Core Vitals • Crashৄࡉ͸Crashlyticsͱ΄΅ಉ͡ • Ϧετදࣔͷ࢓ํʢ·ͱ·Γํʣ͸ଟগҟͳΔ • ࠓͷϓϩδΣΫτͩͱேձͰோΊΔͷʹར༻
 ⇢σόοά࣌ʹ͸CrashlyticsΛར༻
20. Core Vitals • ೉ಡԽΛ໭͢͜ͱ͕Ͱ͖ΔͷͰɺϦϦʔε࣌ʹ͸ mapping.txtΛ্͛๨Εͳ͍Α͏ʹ
21. Pre-Launch Report • ΞϓϦέʔγϣϯͷϦϦʔεલϨϙʔ τΛ࡞੒Ͱ͖Δ • Vitalsͱҧ͍࣮؀ڥͰ͸ͳ͘ɺ੍ݶ͞ Εͨ؀ڥͷͨΊɺσόοάʹඞཁͳ৘ ใ͕ৄࡉʹऔΕΔ • 10+ͷσόΠεͰςετ࣮ࢪ͞ΕΔ
22. Pre-Launch Report • ͍͔ͭ͘ͷ࣠ຖʹςετ݁Ռ͕ݟΕΔ • όʔδϣϯ͝ͱͷਪҠͳͲ΋ՄࢹԽ͞ΕΔ • ςετ಺༰͕ΧελϚΠζ͕Ͱ͖Δʂ
23. Pre-Launch Report ΧελϚΠζ • Firebase Test LabͷཁྖͰΧελϚΠζՄೳ • Robo Script͸ը໘Λૢ࡞͢Δ͚ͩͰ࡞੒Ͱ͖Δ
25. Pre-Launch Report ΧελϚΠζ • ೝূ৘ใΛ෇༩Ͱ͖ΔͷͰɺϩάΠϯՄೳ • ͨͩ͠ɺR.idࢦఆ͕ඞཁɻWebViewͰͷϩάΠϯ࣮૷ͷ৔߹͸NG
26. Pre-Launch Report ΧελϚΠζ • 3ͭ·ͰDeeplinkΛઃఆՄೳ • Robo͸ࣗಈςετͳͷͰɺඞͣߦͬͯ΄͍͠Օ ॴΛࢦఆ͓ͯ͘͠ͱ͍͍ •
27. Pre-Launch Report • ϦϦʔεલͷ࠷ऴνΣοΫͱ͔ͯ͠ͳΓΠέͯΔ • ੵۃతʹར༻͍͖͍͕ͯͨ͠ɺ͕͔͔࣌ؒΔ͜ͱ ΋͋ΔͷͰϦϦʔε௚લʹAPKΛ্͛Δ࣌͸஫ҙ
28. ηογϣϯͰऔΓ্͛ΒΕ͍֤ͯͨࣾͷରԠࣄྫ • Migrated from background services to MediaBrows erService(API26) • Moved to WorkManager • Reduced use of Shared Preferences • Reorganized the app graph to perform less object i nstantiation in application's onCreate()
29. Demystify the Data 
 in Android Studio Profilers ߴػೳͳ1SPGJMFS͕͍ͭͯ·͕͢ɺ ׆༻ͯ͠·͔͢ʁ https://youtu.be/v4kCRZ_O4Lc
30. ProfilerΛ࢖ͬͯϝϞϦϦʔΫͱରቂ͢Δ • CPU / Memory / Network / EnergyͷࢦඪͰݟΕΔ • Memoryʹ Leaked Activities and Fragments ͕૿͑ ͯΔʢAS3.6ʣ
31. Leaked Activities and Fragments ·ͣHeap DumpΛͱΔ ͜͜ʹग़ͯ͘Δ ϦʔΫͯ͠ΔActivity / Fragment
32. ActivityͱFragmentͷϦʔΫͱ͸ʁ • Activity • Has been destroyed but is still referenced • Fragment • Does not have a valid FragmentManager 
 but is still referenced • Possible false positives • Created but has not yet been used • Being cached but not as part of a Fragmenttransaction
33. Instance View • Depth • Native • Shallow • Retained Size
34. Instance View ΦϒδΣΫτࣗ਎ͷαΠζ RootͷΦϒδΣΫτ͕ࢀর ͍ͯ͠ΔΦϒδΣΫτͷ࿨ NativeͷαΠζ • ྫ͑͹ɺ੺ͷΦϒδΣΫτ͕ফ͑ͯ΋ΦϨϯδʹ ଞ͔Βͷࢀর͕࢒͍ͬͯΔͱʁʁ
35. Instance View
36. • ϦʔΫ͍ͯ͠ΔΦϒ δΣΫτ΁ͷࢀরΛ ݟΕΔ • ͜͜Λݟͳ͕Βɺࢀ রΛফ͍ͯ͘͠ͱ͍ ͍ Reference View
37. Կ͕ݪҼͩͬͨͷʁ • ࠓճͷݪҼ͸koinΛ࢖͍ͬͯͯɺಈతʹDIίϯςφʹೖΕͯ ͍ͨViewModelͷΠϯελϯε͔ΒͷFragment΁ͷࢀর͕ ࢒ͬͯ͠·͍ͬͯͨ • Reference Viewͷ͓͔͛ͰҰ໨ྎવͩͬͨͷͰɺ
 ͔ͳΓॿ͔Γ·ͨ͠
38. • ηογϣϯͰ͸CPU Profilerͷ࢖͍ํ΋ৄࡉʹઆ໌͠ ͍ͯΔͷͰɺڵຯ͕͋Ε͹ͥͻݟ·͠ΐ͏
39. Migrating to AndroidX:
 The time is right Jetpack / AndroidXʹҠߦ͸͓ࡁΈͰ͔͢ʁ
40. Jetpack / AndroidX • I/O 2018ͰSupport Library Λ androidxͷnamespaceʹ
 Ҡ͢ൃද͕͞Εͨ • ͢ͰʹSupport Library͸28.0.xͰ։ൃ͕ࢭ·͍ͬͯΔ • όάϑΟοΫεɺ৽ػೳ͸AndroidXʹ • ੵۃతʹ࢖͍͖͍͚ͬͯͨͲɺҠߦ͕ɺɺ
41. Migrating to AndroidX • ΄΅͢΂ͯͷϑΝΠϧʹมߋ͕ೖΔͷͰɺ
 ଞ࡞ۀͱฏߦͯ͢͢͠ΊΔͷ͸͓͢͢ΊͰ͖ͳ͍
 ⇢࡞ۀλΠϛϯάΛௐ੔͢Δ • Ұ൪࢝ΊʹɺϓϩδΣΫτΛόοΫΞοϓ͢Δ͜ͱ
42. Migrating to AndroidX 1. Update to SL 28 AndroidX΁ͷҠߦ =ʮAPI ChangeʯʮPackage Changeʯ Support Library 28 <=> AndroidX 1.0ͷࠩ෼͸PackageͷΈ ·ͣ͸SL28΁ͷΞοϓσʔτΛߦ͍ɺ API changesʹΑͬͯյΕͳ͍͜ͱΛ֬ೝ͢Δ
43. Migrating to AndroidX 2. Enable Jetifier Jetifier will: - Migrate your third-party dependencies to use AndroidX Jetifier will not: - Migrate your source code - Migrate generated code
44. Migrating to AndroidX 3. Update Dependencies Ұ෦ͷ3rdPartyϥΠϒϥϦ͸Ξοϓσʔτ͕ඞཁ Annotation ProcessorͳͲͷίʔυੜ੒ܥͷ΋ͷ͸ ผ్ରԠ͕ͻͭΑ͏ʹͳΔ
45. Migrating to AndroidX 4. Use Studio Refactor > Migrate to AndroidX
46. Migrating to AndroidX 5. Bash Script or Edit yourself Replace all source code instance of support library packages with their AndroidX version https://goo.gle/androidx-migration-script
47. Migrationͷ͋ͱͰ • Patterns we can't automate • ext౳ʹهड़͍ͯ͠Δόʔδϣϯม਺Λॻ͖׵͑Δ͜ͱ͸͠ ͯ͘Εͳ͍ͷͰɺͦ͜͸ࣗ෼Ͱ΍Δඞཁ͋Γ • Proguard files • Build scripts • όʔδϣϯ͕alpha൛ͱ͔ʹͳ͍ͬͯΔ΍ͭ΋͋Δ͔Βɺࣗ ෼Ͱstable൛ͱ͔ʹม͑Δ
48. ॴײ
49. ॴײ • Debug࣌ͷTipsͳͲ͸πʔϧ͕ߋ৽͞Εͯ΋ɺ
 طʹ࣋ͬͯΔ஌ࣝͰରԠ͕ͪ͠ͳͷͰɺߋ৽͍ͯ͜͠͏ • ηογϣϯΛݟճͬͯεϓϦϯτʹ௥ՃػೳΛ͢Ͱʹ3ͭ
 ͘Β͍ੵΜͩͷͰɺͥͻηογϣϯΛ •
50. ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ