ConcatAdapterを深掘る

Transcript

1. Լ઒ܟ߂ !BOESPIJ
   
   $PODBU"EBQUFSΛਂ۷Δ
   QPUBUPUJQT
   

   View Slide

2. w Լ઒ܟ߂
   w ᷂;0;0ςΫϊϩδʔζॴଐ
   w !BOESPIJ
   w ϙϦϓςϧεʢݹ୅ڕʣ
   ࣗݾ঺հ
   

   View Slide

3. ΞδΣϯμ
   w $PODBU"EBQUFSͱ͸ʁ
   w $PODBU"EBQUFSͷϢʔεέʔε
   w $PODBU"EBQUFSͷ໾ׂ
   w 7JFX5ZQFͱ4UBCMF*%ʹ͍ͭͯ
   w $PODBU"EBQUFS͕ߦ͍ͬͯΔ੍ޚ
   w ·ͱΊ
   

   View Slide

4. $PODBU"EBQUFSͱ͸ʁ
   l"O3FDZDMFS7JFX"EBQUFSJNQMFNFOUBUJPOUIBUQSFTFOUTUIFDPOUFOUTPGNVMUJQMFBEBQUFSTJOTFRVFODFz
   "OESPJE%FWFMPQFST3FGFSFODF
   ˞3FDZDMFS7JFXϥΠϒϥϦWFSҎ্͕ඞཁͰ͢
   val headerAdapter = HeaderAdapter()
   val itemAdapter = ItemAdapter()
   val concatAdapter = ConcatAdapter(headerAdapter, itemAdapter)
   binding.recyclerView.adapter = concatAdapter
   

   View Slide

5. $PODBU"EBQUFSͱ͸ʁ
   RecyclerView
   ConcatAdapter HeaderAdapter
   ItemAdapter
   γʔέϯγϟϧ
   

   View Slide

6. $PODBU"EBQUFSͱ͸ʁ
   RecyclerView
   ConcatAdapter
   HeaderAdapter
   ItemAdapter
   γʔέϯγϟϧ
   

   View Slide

7. $PODBU"EBQUFSͷϢʔεέʔε
   )FBEFS
   *UFN"
   *UFN#
   'PPUFS
   *UFN#
   *UFN"
   *UFN"
   *UFN"
   *UFN#
   ୯Ұͷ"EBQUFS
   w ͍Ζ͍Ζͳ7JFX5ZQFΛఆٛ
   w ͍Ζ͍Ζͳ7JFX)PMEFSͷੜ੒ͱEBUBͷCJOEJOH
   w ෳࡶͳϦετΞΠςϜͷΧ΢ϯτ
   $PODBU"EBQUFS
   w ࢠ"EBQUFSͷ࣮૷࣍ୈͰ͸7JFX5ZQFͷఆٛෆཁ
   w ґଘ͢Δ7JFX)PMEFS͸छྨ
   w γϯϓϧͳϦετΞΠςϜͷΧ΢ϯτ
   

   View Slide

8. $PODBU"EBQUFSͷ໾ׂ
   w ௥Ճ͞Εͨ"EBQUFSͰOPUJGZϝιου͕ݺ͹ΕͨΒɺ3FDZDMFS7JFXʹ఻͑Δ
   લʹP⒎TFUΛܭࢉͯ͠OPUJGZ*UFN3BOHF$IBOHFE
   ΛݺͿ
   w $PODBU"EBQUFS$POpHΫϥεΛ༻͍ͯɺ7JFX5ZQFͱ4UBCMF*%ʹؔ͢Δ
   "EBQUFSؒͷ੍ޚΛߦ͏
   

   View Slide

9. 3FDZDMFS7JF͆ʹ఻͑ΔલʹPGGTFUΛܭࢉ͢Δ
   @Override
   public void onItemRangeChanged(@NonNull NestedAdapterWrapper nestedAdapterWrapper,
   int positionStart, int itemCount) {
   final int offset = countItemsBefore(nestedAdapterWrapper);
   mConcatAdapter.notifyItemRangeChanged(
   positionStart + offset,
   itemCount
   );
   }
   

   View Slide

10. 7JFX5ZQFͷ੍ޚʹ͍ͭͯ
    w 5SVF$PODBU"EBQUFS಺ͷ"EBQUFSؒͰ7JFX5ZQFΛڞ༗͠ͳ͍
    w 'BMTFશͯͷ"EBQUFS͕ಉ͡7JFX5ZQFͳΒಉ͡7JFX)PMEFSΛࢀর͢Δ
    ʢ(MPCBM7JFX5ZQF1PPMΛڞ༗͢Δʣ
    public final boolean isolateViewTypes
    

    View Slide

11. 4UBCMF*%ͷ੍ޚʹ͍ͭͯ
    w *40-"5&%@45"#-&@*%4
    w શͯͷ"EBQUFS͕4UBCMF*%Λ࣋ͭ͜ͱΛڧ੍͠ɺ"EBQUFSؒͰ*%ϓʔϧΛ෼཭͢Δ
    w /0@45"#-&@*%4
    w "EBQUFS͕4UBCMF*%Λ஌ΒͤΔ͜ͱΛཁٻ͠ͳ͍ʢσϑΥϧτʣ
    w 4)"3&%@45"#-&@*%4
    w શͯͷ"EBQUFS͕4UBCMF*%Λ࣋ͭ͜ͱΛڧ੍͠ɺ"EBQUFSؒͰ*%ϓʔϧΛڞ༗͢Δ
    public final ConcatAdapter.Config.StableIdMode stableIdMode
    

    View Slide

12. $PODBU"EBQUFS͕ߦ͍ͬͯΔ੍ޚ
    public ConcatAdapter(
    @NonNull Config config,
    @NonNull List extends Adapter extends ViewHolder>> adapters) {
    mController = new ConcatAdapterController(this, config);
    for (Adapter extends ViewHolder> adapter : adapters) {
    addAdapter(adapter);
    }
    super.setHasStableIds(mController.hasStableIds());
    }
    public boolean hasStableIds() {
    return mStableIdMode != NO_STABLE_IDS;
    }
    

    View Slide

13. $PODBU"EBQUFS͕ߦ͍ͬͯΔ੍ޚ
    ConcatAdapterController(ConcatAdapter concatAdapter, ConcatAdapter.Config config) {
    mConcatAdapter = concatAdapter;
    // setup view type handling
    if (config.isolateViewTypes) {
    mViewTypeStorage = new ViewTypeStorage.IsolatedViewTypeStorage();
    } else {
    mViewTypeStorage = new ViewTypeStorage.SharedIdRangeViewTypeStorage();
    }
    // setup stable id handling
    mStableIdMode = config.stableIdMode;
    if (config.stableIdMode == NO_STABLE_IDS) {
    mStableIdStorage = new StableIdStorage.NoStableIdStorage();
    } else if (config.stableIdMode == ISOLATED_STABLE_IDS) {
    mStableIdStorage = new StableIdStorage.IsolatedStableIdStorage();
    } else if (config.stableIdMode == SHARED_STABLE_IDS) {
    mStableIdStorage = new StableIdStorage.SharedPoolStableIdStorage();
    } else {
    throw new IllegalArgumentException("unknown stable id mode");
    }
    }
    

    View Slide

14. ͞Βʹਂງͬͨ಺༰͸
    %SPJE,BJHJʹͯʁ
    

    View Slide

15. ·ͱΊ
    w $PODBU"EBQUFSΛ࢖͏͜ͱͰɺෳ਺ͷ"EBQUFSΛ3FDZDMFS7JFXʹηοτͰ
    ͖Δ
    w "EBQUFSؒͷ7JFX5ZQF΍4UBCMF*%ͷ੍ޚΛɺ$PODBU"EBQUFSͷ಺෦Ͱ͍͍
    ײ͡ʹ΍ͬͯ͘ΕΔ
    w Ͳ͏΍͍͍ͬͯײ͡ʹͯ͠Δͷ͔Λௐ΂ͯΈΔͱ໘നͦ͏
    

    View Slide

16. ࢀߟυΩϡϝϯτ
    w IUUQTNFEJVNDPNBOESPJEEFWFMPQFSTNFSHFBEBQUFSTTFRVFOUJBMMZ
    XJUINFSHFBEBQUFSEB
    w IUUQTEFWFMPQFSBOESPJEDPNSFGFSFODFBOESPJEYSFDZDMFSWJFX
    XJEHFU$PODBU"EBQUFS
    w IUUQTEFWFMPQFSBOESPJEDPNSFGFSFODFBOESPJEYSFDZDMFSWJFX
    XJEHFU$PODBU"EBQUFS$POpH
    w IUUQTEFWFMPQFSBOESPJEDPNSFGFSFODFBOESPJEYSFDZDMFSWJFX
    XJEHFU$PODBU"EBQUFS$POpH4UBCMF*E.PEF
    

    View Slide

17. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

    View Slide