ウィンドウサイズの変更に強い堅牢な画面の構築 / DroidKaigi 2018

DroidKaigi 2018 での発表資料です。 https://droidkaigi.jp/2018/
Room 3 - 2018/02/09 16:50-17:20

【参考資料 / リンク】
<< 前半 : ウィンドウサイズの変更に強いレイアウトの構築 >>
・android:fitsSystemWindows - View | Android Developers
https://developer.android.com/reference/android/view/View.html#attr_android:fitsSystemWindows
・OnApplyWindowInsetsListener (v4 compat library) | Android Developers
https://developer.android.com/reference/android/support/v4/view/OnApplyWindowInsetsListener.html
・View#dispatchApplyWindowInsets | Android Developers
https://developer.android.com/reference/android/view/View.html#dispatchApplyWindowInsets(android.view.WindowInsets)
・ViewGroup#dispatchApplyWindowInsets | Android Developers
https://developer.android.com/reference/android/view/ViewGroup.html#dispatchApplyWindowInsets(android.view.WindowInsets)
・View#onApplyWindowInsets | Android Developers
https://developer.android.com/reference/android/view/View.html#onApplyWindowInsets(android.view.WindowInsets)

<< 後半 : 構成の変更時の画面の状態保持について >>
・Handling Configuration Changes | Android Developers
https://developer.android.com/guide/topics/resources/runtime-changes.html
・guardian/toolargetool | GitHub
https://github.com/guardian/toolargetool
・frankiesardo/Icepick | GitHub
https://github.com/frankiesardo/icepick
・nakamuuu/Retainer | GitHub
https://github.com/nakamuuu/retainer
・StateAwareViewModel - nakamuuu | GitHug Gist
https://gist.github.com/nakamuuu/29d7e358735ab867fb145c210d49f8af
・Of Bundles and ViewModels | ProAndroidDev
https://proandroiddev.com/customizing-the-new-viewmodel-cf28b8a7c5fc

Transcript

1. ΢Οϯυ΢αΠζͷมߋʹڧ͍
   ݎ࿚ͳը໘ͷߏங
2. Fablic, inc. Android Application Developer தଜ
   ܙଠ @nakamuuu @chicken_111 2 ࣗݾ঺հ
3. ྦྷܭ ສ μ΢ϯϩʔυ
   
   
   ಥഁʂ 3 ϑϦϚΞϓϦʮϑϦϧʯʹ͍ͭͯ
4. ϑϦϚΞϓϦʮϑϦϧʯʹ͍ͭͯ 4 ϑϦϚΞϓϦʮϑϦϧʯ͸
   ৽͍͠ʮϥΫϚʯͱͯ͠ੜ·ΕมΘΓ·͢ʂ ʢ50%0
   -1ͷεΫγϣʣ
5. ྦྷܭ 5 ϑϦϚΞϓϦʮϑϦϧʯʹ͍ͭͯ
6. ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍
   ɹݎ࿚ͳը໘ʱͱ͸ʁ 6
7. 7 ΢Οϯυ΢αΠζͷมߋ ը໘ճస Ϛϧν΢Οϯυ΢ ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍ݎ࿚ͳը໘ʱͱ͸ʁ
8. 8 ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍ݎ࿚ͳը໘ʱͱ͸ʁ ΢Οϯυ΢αΠζͷมߋΛߟྀ͠ͳ͍ͱʜʁ
9. 9 ϨΠΞ΢τͷ่Ε ʢྫʣ௨ৗͱҟͳΔγεςϜ6*ͷ഑ஔΛߟྀͰ͖͍ͯͳ͍ ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍ݎ࿚ͳը໘ʱͱ͸ʁ εςʔλεόʔ෼ͷ༨ന
10. 10 ը໘ͷঢ়ଶ͕ࣦΘΕΔ ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍ݎ࿚ͳը໘ʱͱ͸ʁ
11. 11 ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍ݎ࿚ͳը໘ʱ ɾ͍͔ͳΔ΢Οϯυ΢αΠζɾγεςϜ6*ͷ഑ஔͰ΋
    ɹϨΠΞ΢τͷ่Ε͕ൃੜ͠ͳ͍ ɾߏ੒ͷมߋΛލ͍Ͱ΋"DUJWJUZ
    
    'SBHNFOU͕
    ɹը໘ͷঢ়ଶΛద੾ʹอ࣋ɾදࣔ͢Δ ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍ݎ࿚ͳը໘ʱͱ͸ʁ
12. 12 w
    ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங
    w
    8JOEPX*OTFUTΛཧղͯ͠ɺγεςϜ6*ͷ഑ஔʹɹ Өڹ͞Εͳ͍ϨΠΞ΢τΛ૊Ή
    w
    ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ
    w
    TBWFE*OTUBODF4UBUFɺTFU3FUBJO*OTUBODFɺɹɹ ͦΕͧΕͷঢ়ଶอ࣋ͷख๏ͷར఺ͱ࢖͍෼͚ ࠓ೔͓࿩͢͠Δ͜ͱ
13. ΢Οϯυ΢αΠζͷมߋʹڧ͍
    ϨΠΞ΢τͷߏங 13
14. 14 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங Ϛϧν΢Οϯυ΢ػೳͷଘࡏ ϨΠΞ΢τͷߏஙͰߟྀ͢΂͖͜ͱ͕૿͑ͨ w
    ෯ɾߴ͞ڞʹදࣔྖҬ͕ڱ͍ঢ়ଶͰͷϨΠΞ΢τ
    w
    MBZPVUEJNFOϦιʔεͷΑΓద੾ͳ࢖͍෼͚
    w
    ௨ৗͱҟͳΔγεςϜ6*ʢεςʔλεόʔ౳ʣͷ഑ஔ
15. 15 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ௨ৗͱҟͳΔγεςϜ6*ʢεςʔλεόʔ౳ʣͷ഑ஔ εςʔλεόʔͷߴ͞Λ
    ద੾ʹѻΘͳ͍ͱ༨෼ͳεϖʔε͕
16. 16 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ෆࢥٞͳεςʔλεόʔͷ୺຤΋ʜʁ
17. 17 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங 04όʔδϣϯ͝ͱʹఆٛʜʁ <dimen name=“status_bar_height”>0dp</dimen> WBMVFTEJNFOTYNM <dimen name=“status_bar_height”>25dp</dimen> WBMVFTWEJNFOTYNM <dimen name=“status_bar_height”>24dp</dimen> WBMVFTWEJNFOTYNM val resId = res.getIdentifier(“status_bar_height”, “dimen”, “android”) val statusBarHeight = res.getDimensionPixelSize(resId) γεςϜϦιʔεΛऔಘʜʁ
18. 18 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங BOESPJEGJUT4ZTUFN8JOEPXT ʮεςʔλεόʔͷߴ͞Λऔಘ͢Δʯͱ͍͏
    Ξϓϩʔν͸Ұ୴ٙ͏΂͖ #PPMFBO
    JOUFSOBM
    BUUSJCVUF
    UP
    BEKVTU
    WJFX
    MBZPVU
    CBTFE
    PO
    TZTUFN
    XJOEPXT
    TVDI
    BT
    UIF
    TUBUVT
    CBS
    *G
    USVF
    BEKVTUT
    UIF
    QBEEJOH
    PG
    UIJT
    WJFX
    UP
    MFBWF
    TQBDF
    GPS
    UIF
    TZTUFN
    XJOEPXT
19. 19 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங   ฐࣾ"OESPJEΤϯδχΞʹฉ͖·ͨ͠
    งғؾͰ࢖͍ͬͯΔ7JFXͷϓϩύςΟ͸ʁ GJUT4ZTUFN8JOEPXT ະճ౴
20. 20 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங   ฐࣾ"OESPJEΤϯδχΞʹฉ͖·ͨ͠
    งғؾͰ࢖͍ͬͯΔ7JFXͷϓϩύςΟ͸ʁ GJUT4ZTUFN8JOEPXT ະճ౴ ʢճ౴਺
    ʣ
21. 21 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ʢσϑΥϧτͷڍಈʣ w
    GJUT4ZTUFN8JOEPXTΛࢦఆ͢ΔͱγεςϜ6*෼ͷ QBEEJOHΛ͚ͭͯදࣔˍࢠ7JFXΛ഑ஔ͢Δ
    w
    GJUT4ZTUFN8JOEPXTΛࢦఆͨ͠7JFX͕ෳ਺ݸɹ ଘࡏ͢Δ৔߹ɺਂ͞༏ઌతʹ୧ͬͨ࠷ॳͷ7JFX͚ͩ Πϯηοτ͕EJTQBUDI͞ΕΔ
    w
    8JOEPX*OTFUTʹDPOTVNFEͰ͋Δ͔ͷϑϥά͕ ଘࡏ͢Δ ˞7JFXPO"QQMZ8JOEPX*OTFUT
    
    7JFX(SPVQEJTQBUDI"QQMZ8JOEPX*OTFUT
    ࢀর
22. 22 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ˞TFU4ZTUFN6J7JTJCJMJUZ 4:45&.@6*@'-"(@-":065@'6--4$3&&/
    c4:45&.@6*@'-"(@-":065@45"#-& Λࢦఆ <FrameLayout android:fitsSystemWindows=“true|false”> <android.support.v7.widget.Toolbar /> </FrameLayout>
23. 23 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங <LinearLayout android:orientation=“horizontal”> <FrameLayout android:fitsSystemWindows=“true”> <android.support.v7.widget.Toolbar /> </FrameLayout> <FrameLayout android:fitsSystemWindows=“true”> <android.support.v7.widget.Toolbar /> </FrameLayout> </LinearLayout>
24. 24 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங GJUT4ZTUFN8JOEPXTΛUSVFʹͰ͖Δ7JFX͸͚ͭͩʁ <android.support.v4.widget.DrawerLayout android:fitsSystemWindows=“true”> <android.support.constraint.ConstraintLayout /> <android.support.design.widget.NavigationView android:layout_gravity=“start” android:fitsSystemWindows=“true” /> </android.support.v4.widget.DrawerLayout> ʢ"OESPJE
    4UVEJPͷςϯϓϨʔτʮ/BWJHBUJPO
    %SBXFS
    "DUJWJUZʯʣ
25. 25 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ࣗ਎·ͨ͸ࢠ7JFXͷGJUT4ZTUFN8JOEPXTͷ
    ղऍΛΧελϚΠζ͢Δ͜ͱ͕Մೳ 8JOEPX*OTFUTΛQBEEJOHʹ෇͚ସ͑Δͷ͸
    7JFXPO"QQMZ8JOEPX*OTFUTͰͷσϑΥϧτͷڍಈ
26. 26 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங 7JFXPO"QQMZ8JOEPX*OTFUT 8JOEPX*OTFUTΛQBEEJOHʹ෇͚ସ͑Δͷ͕σϑΥϧτ ΦʔόʔϥΠυ͠ͳͯ͘΋
    0O"QQMZ8JOEPX*OTFUT-JTUFOFSͰॲཧΛԣऔΓͰ͖Δ // View#onApplyWindowInsetsͷ୅ΘΓʹݺ͹ΕΔ ViewCompat.setOnApplyWindowInsetsListener(view) { v, insets -> // View#onApplyWindowInsets ͷσϑΥϧτͷॲཧΛߦ͏͜ͱ΋Մೳ val result = ViewCompat.onApplyWindowInsets(v, insets) // ద੾ͳWindowInsetsΛฦ͢ return result }
27. ʢ%SBXFS-BZPVUͷڍಈʣ 27 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங w
    0O"QQMZ8JOEPX*OTFUT-JTUFOFSͰ 8JOEPX*OTFUTͷมߋΛݕ஌
    
    SFRVFTU-BZPVU
    w
    7JFXPO"QQMZ8JOEPX*OTFUT͕ݺ͹Εͳ͘ͳΓɺ QBEEJOH͕෇༩͞Εͳ͘ͳΔ
    w
    PO.FBTVSFͰGJUT4ZTUFN8JOEPXT͕USVFͳɹɹ ࢠ7JFXʹରͯ͠ΠϯηοτΛ௚઀EJTQBUDI
    w
    ಉ࣌ʹGJUT4ZTUFN8JOEPXT͕GBMTFͳࢠ7JFXͷ NBSHJOʹΠϯηοτ෼ͷ஋Λઃఆ
28. 28 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ίϯςϯπྖҬ
    ʢGJUT4ZTUFN8JOEPXTGBMTFʣ w
    PO.FBTVSFͰNBSHJOΛ෇༩͞ ΕΔͷͰεςʔλεόʔʹඃΒͣ දࣔ͞ΕΔ ˞εςʔλεόʔͷྖҬ͸0O"QQMZ8JOEPX*OTFUT-JTUFOFSͰऔಘ͞Εͨ
    ΠϯηοτΛجʹ%SBXFS-BZPVU͕ࣗલͰృΓͭͿ͢
    ʢBOESPJETUBUVT#BS$PMPSʹ͸!BOESPJEDPMPSUSBOTQBSFOUΛࢦఆʣ
29. 29 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங /BWJHBUJPO7JFX
    ʢGJUT4ZTUFN8JOEPXTUSVFʣ w
    8JOEPX*OTFUT͕QBEEJOHʹ ෇͚ସ͑ΒΕͳ͍ͷͰεςʔλ εόʔͷྖҬ·Ͱදࣔ͞ΕΔ
    w
    8JOEPX*OTFUT͕EJTQBUDI ͞ΕΔͷͰɺΠϯηοτΛϋϯ υϧͰ͖Δ
30. 30 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ࠔͬͨ࣌ͷEJTQBUDIܳ ࣗ਎ʹ΋ࢠ7JFXʹ΋8JOEPX*OTFUTΛ෇༩͍ͤͨ͞ʂ w
    PO.FBTVSF΍PO"QQMZ8JOEPX*OTFUTͰࢠ7JFX ͷEJTQBUDI"QQMZ8JOEPX*OTFUTΛ௚઀ݺͿ
    w
    ྫ͑͹/BWJHBUJPO7JFXͰ͸ࣗ਎ʹ෇༩͞Εͨɹɹ ΠϯηοτΛϔομʔ༻ͷ7JFX΁EJTQBUDI͍ͯ͠Δ ˞/BWJHBUJPO.FOV1SFTFOUFSEJTQBUDI"QQMZ8JOEPX*OTFUT
    ࢀর
31. 31 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங ͋Δ͍͸ʜ
    PO"QQMZ8JOEPX*OTFUTͰDPOTVNF͠ͳ͍ ViewCompat.setOnApplyWindowInsetsListener(view) { v, insets -> // View#onApplyWindowInsets ͷσϑΥϧτͷॲཧΛߦΘͤΔ ViewCompat.onApplyWindowInsets(v, insets) // ௨ৗ͸insets.consumeSystemWindowInsets()Λฦ͕͢ɺ // ࣗ਎Ҏ߱ͷViewʹ΋ΠϯηοτΛ෇༩͍ͨ͠ͷͰinsetsΛͦͷ··ฦ͢ return insets } GJUT4ZTUFN8JOEPXTUSVFͳΒDPOTVNF͞ΕΔ
    લఏ่͕ΕΔͷͰཚ༻͢Δͱࠞಱͱͦ͠͏ʜ
32. 32 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங εςʔλεόʔͷߴ͞Λऔಘ͢Δ ViewCompat.setOnApplyWindowInsetsListener(view) { v, insets -> statuBarSize = insets.systemWindowInsetTop return ViewCompat.onApplyWindowInsets(v, insets) } ͦΕͰ΋GJUT4ZTUFN8JOEPXTͰ͸Ͳ͏ʹ΋Ͱ͖ͳ͍
    PS
    εςʔλεόʔͷྖҬʹESBX͍ͨ͠ ˞/BWJHBUJPO7JFXͷܧঝݩͰ͋Δ4DSJN*OTFUT'SBNF-BZPVU͕޷ྫ
33. 33 ΢Οϯυ΢αΠζͷมߋʹڧ͍ϨΠΞ΢τͷߏங w
    εςʔλεόʔͳͲͷαΠζΛΉ΍Έʹऔಘ͠Α͏ͱ ͤͣʹɺGJUT4ZTUFN8JOEPXTΛ׆༻͢΂͖
    w
    ෳࡶͳը໘Ͱ͸0O"QQMZ8JOEPX*OTFU-JTUFOFSͰ σϑΥϧτͷॲཧΛԣऔΓͨ͠ΓɺࣗલͰࢠ7JFXʹ ରͯ͠8JOEPX*OTFUTΛEJTQBUDI͢Δํ๏͕࢖͑Δ γεςϜ6*ͷ഑ஔʹӨڹ͞Εͳ͍ϨΠΞ΢τΛ૊Ήʹ͸ʁ 8JOEPX*OTFUTͷѻ͍Λ޻෉ͯ͠
    γεςϜ6*ͷ഑ஔʹڧ͍ϨΠΞ΢τߏஙΛ
34. ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ ͍ͭͯ 34
35. 35 ը໘ͷঢ়ଶ͕ࣦΘΕΔ ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ
36. 36 w
    ΢Οϯυ΢αΠζͷมߋͳͲͷߏ੒ͷมߋ࣌ʹ͸ɹɹ ࣮ߦதͷ"DUJWJUZ
    
    'SBHNFOU͸࠶ੜ੒͞ΕΔ
    w
    ৽͍͠ߏ੒༻ͷϦιʔεΛ࢖༻ͨ͠දࣔʹ੾Γସ͑ ΔͷΛࢧԉ͢ΔͨΊͷσϑΥϧτͷڍಈ
    w
    BOESPJEDPOGJH$IBOHFTΛࢦఆ͢Δ͜ͱͰࣗલ Ͱ΋؅ཧͰ͖Δ ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ ߏ੒ͷมߋΛލ͍Ͱը໘ঢ়ଶʹؔ͢ΔσʔλΛ ద੾ʹอ࣋͢Δ͜ͱ͕ཁٻ͞ΕΔ
37. 37 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ "OESPJE
    %FWFMPQFST
    ʮ)BOEMJOH
    $POGJHVSBUJPO
    $IBOHFTʯ
38. 38 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ ᶃ PO4BWF*OTUBODF4UBUF Ͱ#VOEMFʹ֨ೲ͠ɺ PO$SFBUF PO3FTUPSF*OTUBODF4UBUF Ͱ෮ݩ
    ᶄ TFU3FUBJO*OTUBODF USVF Λݺͼग़ͨ͠'SBHNFOU ʹσʔλΛ֨ೲ "OESPJE
    %FWFMPQFST
    ʮ)BOEMJOH
    $POGJHVSBUJPO
    $IBOHFTʯ
39. 39 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ ᶃ
    PO4BWF*OTUBODF4UBUF Ͱอ࣋ class ExampleActivity: AppCompatActivity() { private var foo: Foo? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) foo = savedInstanceState?.getParcelable("foo") } override fun onSaveInstanceState(outState: Bundle) { super.onSaveInstanceState(outState) outState.putParcelable("foo", foo) } }
40. ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ 40 w
    γϦΞϥΠζɾσγϦΞϥΠζΛ൐͍ɺϝϞϦফඅɾ ଎౓ͷ໘Ͱίετ͕େ͖͍ͷͰɺଟྔͷσʔλΛอ࣋ ͢Δ༻్ʹ͸޲͔ͳ͍
    w
    ߏ੒ͷมߋதʹ΋ঢ়ଶ͕มΘΓ͏Δεςʔτϑϧͳɹ ΦϒδΣΫτͷอ࣋ʹ͸࢖༻Ͱ͖ͳ͍
    w
    ωοτϫʔΫ઀ଓͷܧଓͳͲʹ͸༻͍ʹ͍͘ ᶃ
    PO4BWF*OTUBODF4UBUF Ͱอ࣋
41. ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ 41 w
    4DSPMM7JFX
    
    :ํ޲ͷεΫϩʔϧҐஔΛอ࣋
    w
    5FYU7JFX
    
    BOESPJEGSFF[FT5FYU͕USVFͳ৔߹ʹɹɹ ςΩετΛอ࣋ʢ&EJU5FYU͸σϑΥϧτͰUSVFʣ
    w
    $PNQPVOE#VUUPO
    
    DIFDLFEͰ͋Δ͔Λอ࣋ ᶃ
    PO4BWF*OTUBODF4UBUF Ͱอ࣋ Ұ෦ͷ7JFX͸ࣗલͰঢ়ଶΛอ࣋͢Δ
    ʢ˞֤7JFXͷPO4BWF*OTUBODF4UBUF ͷ࣮૷ࢀরʣ
42. 42 ᶃ
    PO4BWF*OTUBODF4UBUF Ͱอ࣋ "OESPJE
    Ҏ߱ͰଟྔͷσʔλΛอ࣋͢Δͱ
    5SBOTBDUJPO5PP-BSHF&YDFQUJPO͕UISPX͞ΕΔ ʢ"OESPJE
    
    #FIBWJPS
    $IBOHFTʣ ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ
43. HVBSEJBOUPPMBSHFUPPM
    IUUQTHJUIVCDPNHVBSEJBOUPPMBSHFUPPM 43 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ
44. 44 ᶄ
    'SBHNFOUTFU3FUBJO*OTUBODF USVF Λ༻͍ͯอ࣋ class ExampleActivity: AppCompatActivity() { private var retainedFragment: RetainedFragment? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) retainedFragment = getSupportFragmentManager() .findFragmentByTag(“tag") as? RetainedFragment if (retainedFragment == null) { // লུ: RetainedFragmentͷΠϯελϯεΛੜ੒ˍcommit } } } class RetainedFragment: Fragment() { var foo: Foo? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setRetainInstance(true) } } ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ
45. ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ 45 ᶄ
    'SBHNFOUTFU3FUBJO*OTUBODF USVF Λ༻͍ͯอ࣋ w
    γϦΞϥΠζɾσγϦΞϥΠζΛ൐Θͳ͍ͨΊɺɹɹ εςʔτϑϧͳΦϒδΣΫτͷอ࣋ʹ࢖༻Ͱ͖Δ
    w
    "SDIJUFDUVSF
    $PNQPOFOUTͷ7JFX.PEFM΋ TFU3FUBJO*OTUBODF USVF
    Λݺͼग़ͨ͠'SBHNFOU Ͱอ࣋͞Ε͍ͯΔ ˞BOESPJEBSDIMJGFDZDMF)PMEFS'SBHNFOU
    ࢀর
46. 46 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ ඇਪ঑ʜʁ
    PO3FUBJO$VTUPN/PO$POGJHVSBUJPO*OTUBODF Ͱอ࣋ class ExampleActivity: AppCompatActivity() { private var foo: Foo? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) foo = getLastCustomNonConfigurationInstance() as? Foo } override fun onRetainCustomNonConfigurationInstance(): Any? { return foo } }
47. 47 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ w
    "OESPJE
    Y࣌୅·Ͱਪ঑͞Ε͍ͯͨํ๏
    w
    "DUJWJUZPO3FUBJO/PO$POGJHVSBUJPO*OTUBODF ͷEFQSFDBUFE͕"OESPJE
    ͔Β֎͞Ε͍ͯΔ͕ɺ جຊతʹ͸Ҿ͖ଓ͖'SBHNFOUΛ༻͍Δํ๏͕ਪ঑͞ Ε͍ͯΔ ˞IUUQTHJUIVCDPNBPTQNJSSPSQMBUGPSN@GSBNFXPSLT@CBTFDPNNJUDEGCD
    
    ͓Αͼ"DUJWJUZHFU-BTU/PO$POGJHVSBUJPO*OTUBODFͷ+BWBEPDࢀর ඇਪ঑ʜʁ
    PO3FUBJO$VTUPN/PO$POGJHVSBUJPO*OTUBODF Ͱอ࣋
48. ᶃ PO4BWF*OTUBODF4UBUF Ͱ#VOEMFʹ֨ೲ͠ɺ PO$SFBUF PO3FTUPSF*OTUBODF4UBUF Ͱ෮ݩ
    ᶄ TFU3FUBJO*OTUBODF USVF Λݺͼग़ͨ͠'SBHNFOU ʹσʔλΛ֨ೲ 48 ࢖͍෼͚Λߟ͑Δ্Ͱ஫ҙ͢΂͖ͳͷ͸
    อ࣋ͨ͠σʔλͷʮण໋ʯ ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ
49. 49 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ PO4BWF*OTUBODF4UBUFͰอ࣋ TFU3FUBJO*OTUBODF USVF Λ
    ݺͼग़ͨ͠'SBHNFOUͰอ࣋ ʲࢀߟʳ"QQMJDBUJPOΫϥε΍
    γϯάϧτϯͰอ࣋ ߏ੒ͷมߋ
    ʢը໘ճసɾ΢Οϯυ΢αΠζͷมߋʣ "DUJWJUZͷഁغ ϓϩηεͷഁغ
50. 50 ߏ੒ͷมߋ࣌ͷը໘ͷঢ়ଶอ࣋ʹ͍ͭͯ ᶃ PO4BWF*OTUBODF4UBUF Ͱ#VOEMFʹ֨ೲ͠ɺ PO$SFBUF PO3FTUPSF*OTUBODF4UBUF Ͱ෮ݩ ᶄ TFU3FUBJO*OTUBODF USVF Λݺͼग़ͨ͠'SBHNFOU ʹσʔλΛ֨ೲ "DUJWJUZͷഁغͱͱ΋ʹফࣦ͢Δ͕ɺ
    ଟྔͰεςʔτϑϧͳσʔλΛอ࣋Ͱ͖Δ "DUJWJUZͷελοΫ͕ଘࡏ͢ΔݶΓ࢒Γଓ͚Δ͕ɺ
    γϦΞϧԽՄೳͳগྔͷσʔλͷΈอ࣋Ͱ͖Δ
51. ը໘ͷঢ়ଶอ࣋ͷख๏Λ
    Ͳ͏ޮՌతʹ࢖͍෼͚Δ͔ 51
52. 52 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ ڈ೥·ͰͷϑϦϧ Կ΋͔΋PO4BWF*OTUBODF4UBUF Ͱอ࣋
    
53. 53 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ UBSHFU4EL7FSTJPOΛʹҾ্͖͛Δͱʜ ʢ˞5SBOTBDUJPO5PP-BSHF&YDFQUJPOʣ
54. 54 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ ͜Ε͔ΒͷϑϦϧ
    ΋ͱ͍ϥΫϚ ϙϦγʔΛ࣋ͬͯঢ়ଶอ࣋ͷख๏Λ࢖͍෼͚Δ
55. 55 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ ෮ݩՄೳ ෮ݩෆೳ ݕࡧ݁Ռ ৽ண঎඼Ұཡ
    ʢλΠϜϥΠϯʣ ग़඼தͷೖྗ಺༰ ͓஌Βͤ ৄࡉݕࡧͷ৚݅ ฤूதͷϓϩϑΟʔϧ PO4BWF*OTUBODF4UBUF Ͱ
    อ࣋ TFU3FUBJO*OTUBODF USVF Λ
    ݺͼग़ͨ͠'SBHNFOUͰอ࣋
56. 56 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ ෮ݩՄೳ ෮ݩෆೳ PO4BWF*OTUBODF4UBUF Ͱ
    อ࣋ TFU3FUBJO*OTUBODF USVF Λ
    ݺͼग़ͨ͠'SBHNFOUͰอ࣋ w
    ՝୊ᶃ
    
    ௿͍ίετͰޮ཰తʹ'SBHNFOUΛ࢖༻͢Δ ঢ়ଶอ࣋ͷํ๏ʹҠߦ͍ͨ͠
    w
    ՝୊ᶄ
    
    ͭͷը໘Ͱण໋͕ҟͳΔͭͷঢ়ଶอ࣋ͷ ख๏Λ༻͍ͨ࣌ͷ੔߹ੑΛ୲อ͍ͨ͠
57. 57 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ ՝୊ᶃ
    
    ௿͍ίετͰޮ཰తʹ'SBHNFOUΛ࢖༻͢Δ
    ঢ়ଶอ࣋ͷํ๏ʹҠߦ͍ͨ͠ ͜Ε·Ͱ͸΄΅શͯͷը໘Ͱ
    GSBOLJFTBSEP*DFQJDL
    Λ࢖༻
    IUUQTHJUIVCDPNGSBOLJFTBSEPJDFQJDL class ExampleActivity: AppCompatActivity() { @JvmField @State var foo: Foo? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) Icepick.restoreInstanceState(this, savedInstanceState) } override fun onSaveInstanceState(outState: Bundle) { super.onSaveInstanceState(outState) Icepick.saveInstanceState(this, outState) } }
58. 58 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ OBLBNVVV3FUBJOFS
    IUUQTHJUIVCDPNOBLBNVVVSFUBJOFS
59. 59 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ ՝୊ᶃ
    
    ௿͍ίετͰޮ཰తʹ'SBHNFOUΛ࢖༻͢Δ
    ঢ়ଶอ࣋ͷํ๏ʹҠߦ͍ͨ͠ class ExampleActivity: AppCompatActivity() { @JvmField @Retain var foo: Foo? = null override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) Retainer.bind(this) } } "OOPUBUJPO1SPDFTTPSͰ*DFQJDLͷΑ͏ʹ
    ϑΟʔϧυͷอ࣋Λߦ͑ΔϥΠϒϥϦΛ࡞੒
60. 60 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ 7JFX.PEFM
    "SDIJUFDUVSF
    $PNQPOFOUT ՝୊ᶄ
    
    ͭͷը໘Ͱण໋͕ҟͳΔͭͷঢ়ଶอ࣋ͷɹ ख๏Λ༻͍ͨ࣌ͷ੔߹ੑΛ୲อ͍ͨ͠ w
    "DUJWJUZ
    
    'SBHNFOU͔Β6*ʹؔΘΒͳ͍ϩδοΫ ΛҾ͖ണ͕͠ɺςελϏϦςΟΛ୲อͰ͖Δͷ͕ར఺
    w
    PO4BWF*OTUBODF4UBUF
    Ͱͷอ࣋ɾ෮ݩͷ੹೚΋ Ͱ͖ΔݶΓ7JFX.PEFMʹԡ͜͠Έ͍ͨʜ
61. ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ 61 TBWFE*OTUBODF4UBUFΛੜ੒࣌ʹ౉ͤΔ
    7JFX.PEFM
    
    'BDUPSZΛ࡞੒ ˞
    IUUQTQSPBOESPJEEFWDPNDVTUPNJ[JOHUIFOFXWJFXNPEFMDGCBDGD
    ࢀߟ abstract class StateAwareViewModel(app: Application) : AndroidViewModel(app) { abstract fun saveInstanceState(outState: Bundle) abstract fun restoreInstanceState(state: Bundle?) } class StateAwareViewModelFactory( private val application: Application, private val savedInstanceState: Bundle? ) : ViewModelProvider.NewInstanceFactory() { override fun <T : ViewModel> create(modelClass: Class<T>): T { return if (StateAwareViewModel::class.java.isAssignableFrom(modelClass)) { return modelClass.getConstructor(Application::class.java) .newInstance(application) .also { (it as StateAwareViewModel) .restoreInstanceState(savedInstanceState) } } else super.create(modelClass) } }
62. 62 ը໘ͷঢ়ଶอ࣋ͷख๏ΛͲ͏ޮՌతʹ࢖͍෼͚Δ͔ ՝୊ᶄ
    
    ͭͷը໘Ͱण໋͕ҟͳΔͭͷঢ়ଶอ࣋ͷɹ ख๏Λ༻͍ͨ࣌ͷ੔߹ੑΛ୲อ͍ͨ͠ TBWFE*OTUBODF4UBUF͔Βద੾ʹঢ়ଶ͕෮ݩͤ͞Δ͔ 7JFX.PEFMଆͷςετͰ୲อͰ͖Δ
    w
    7JFX.PEFM
    
    TBWFE*OTUBODF4UBUFͱ΋อ࣋͞Ε͍ͯΔέʔε
    w
    TBWFE*OTUBODF4UBUFͷΈ͕อ࣋͞Ε͍ͯΔέʔε TBWFE*OTUBODF4UBUFΛੜ੒࣌ʹ౉ͤΔ
    7JFX.PEFM
    
    'BDUPSZΛ࡞੒
63. ·ͱΊ 63
64. 64 ·ͱΊ w
    GJUT4ZTUFN8JOEPXT
    
    8JOEPX*OTFUTΛ׆༻͠ɺ γεςϜ6*ͷ഑ஔʹӨڹ͞Εͳ͍ϨΠΞ΢τΛ૊Ή
    w
    ը໘ͷঢ়ଶอ࣋ͷख๏ΛޮՌతʹ࢖͍෼͚ͯߏ੒ͷɹ มߋʹڧ͍ը໘Λߏங͢Δ ʰ΢Οϯυ΢αΠζͷมߋʹڧ͍ݎ࿚ͳը໘ʱͰ
    ΑΓ"OESPJEΒ͍͠ߴ඼࣭ͳΞϓϦΛ ଟ࠼ͳը໘αΠζɺϚϧν΢Οϯυ΢͸"OESPJEͷಛ৭ʜ
65. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ɻ