recyclerview-selection

at potatotips #50

Transcript

1. CONFIDENTIAL © DMM.com !LHNZTIJO QPUPUJQT 4VQQPSU
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7. © DMM.com X ͲΜͳػೳʁ
8. © DMM.com X ࢖͍ํ
9. © DMM.com X લ४උ data class Book( val id: Long, val title: String, val subTitle: String ) ͜ͷ
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10. © DMM.com X લ४උ 3FDZDMFS7JFXɺ7JFX)PMEFSɺ"EBQUFS͸Ұ୴௨ৗ௨Γ
 ͨͩɺTUBCMF*EΛ࢖͏Α͏ʹ͢Δ class BookAdapter( context: Context, private val bookList: List<Book> ) : RecyclerView.Adapter<BookViewHolder>() { init { setHasStableIds(true) } : override fun getItemId(position: Int): Long = bookList[position].id : }
11. © DMM.com X લ४උ 3FDZDMFS7JFXɺ7JFX)PMEFSɺ"EBQUFS͸Ұ୴௨ৗ௨Γ
 ͨͩɺTUBCMF*EΛ࢖͏Α͏ʹ͢Δ class BookAdapter( context: Context, private val bookList: List<Book> ) : RecyclerView.Adapter<BookViewHolder>() { init { setHasStableIds(true) } : override fun getItemId(position: Int): Long = bookList[position].id : }
12. © DMM.com X 4FMFDUJPO5SBDLFSΠϯελϯεΛ࡞Δ selectionTracker = SelectionTracker.Builder<Long>( "my-selection-id", binding.recyclerView, StableIdKeyProvider(binding.recyclerView), BookIdDetailsLookup(binding.recyclerView), StorageStrategy.createLongStorage()) .withOnItemActivatedListener { item, e -> Log.e("MainActivity", item.toString()) return@withOnItemActivatedListener true } .build()
13. © DMM.com X 4FMFDUJPO5SBDLFSΠϯελϯεΛ࡞Δ selectionTracker = SelectionTracker.Builder<Long>( "my-selection-id", binding.recyclerView, StableIdKeyProvider(binding.recyclerView), BookIdDetailsLookup(binding.recyclerView), StorageStrategy.createLongStorage()) .withOnItemActivatedListener { item, e -> Log.e("MainActivity", item.toString()) return@withOnItemActivatedListener true } .build() ୈҰҾ਺ɻϢχʔΫͳจࣈྻΛɻ
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14. © DMM.com X 4FMFDUJPO5SBDLFSΠϯελϯεΛ࡞Δ selectionTracker = SelectionTracker.Builder<Long>( "my-selection-id", binding.recyclerView, StableIdKeyProvider(binding.recyclerView), BookIdDetailsLookup(binding.recyclerView), StorageStrategy.createLongStorage()) .withOnItemActivatedListener { item, e -> Log.e("MainActivity", item.toString()) return@withOnItemActivatedListener true } .build() ୈೋҾ਺ɻ
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15. © DMM.com X 4FMFDUJPO5SBDLFSΠϯελϯεΛ࡞Δ selectionTracker = SelectionTracker.Builder<Long>( "my-selection-id", binding.recyclerView, StableIdKeyProvider(binding.recyclerView), BookIdDetailsLookup(binding.recyclerView), StorageStrategy.createLongStorage()) .withOnItemActivatedListener { item, e -> Log.e("MainActivity", item.toString()) return@withOnItemActivatedListener true } .build() ୈࡾҾ਺ɻબ୒தͷΞΠςϜͱબ୒தͷLFZͷରԠΛղܾ͢ Δ*E,FZ1SPWJEFSΛࢦఆ͢Δɻࠓճͩͱ͋ΔTUBCMF*E CPPLJE ʹ͍ͨͯ͠ͲΕ͕ର৅ͷ#PPL͔ͷؔ܎Λղܾ͢Δɻ
16. © DMM.com X 4FMFDUJPO5SBDLFSΠϯελϯεΛ࡞Δ selectionTracker = SelectionTracker.Builder<Long>( "my-selection-id", binding.recyclerView, StableIdKeyProvider(binding.recyclerView), BookIdDetailsLookup(binding.recyclerView), StorageStrategy.createLongStorage()) .withOnItemActivatedListener { item, e -> Log.e("MainActivity", item.toString()) return@withOnItemActivatedListener true } .build() ୈ࢛Ҿ਺ɻ.PUJPO&WFOU
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17. © DMM.com X 4FMFDUJPO5SBDLFSΠϯελϯεΛ࡞Δ selectionTracker = SelectionTracker.Builder<Long>( "my-selection-id", binding.recyclerView, StableIdKeyProvider(binding.recyclerView), BookIdDetailsLookup(binding.recyclerView), StorageStrategy.createLongStorage()) .withOnItemActivatedListener { item, e -> Log.e("MainActivity", item.toString()) return@withOnItemActivatedListener true } .build() ୈޒҾ਺ɻ
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18. © DMM.com X 4FMFDUJPO5SBDLFSΠϯελϯεΛ࡞Δ selectionTracker = SelectionTracker.Builder<Long>( "my-selection-id", binding.recyclerView, StableIdKeyProvider(binding.recyclerView), BookIdDetailsLookup(binding.recyclerView), StorageStrategy.createLongStorage()) .withOnItemActivatedListener { item, e -> Log.e("MainActivity", item.toString()) return@withOnItemActivatedListener true } .build() ඞཁͩͬͨΒϦεφʔొ࿥ɻ
19. © DMM.com X #PPL*E%FUBJMT-PPLVQΛ࡞Δ class BookIdDetailsLookup( private val recyclerView: RecyclerView ) : ItemDetailsLookup<Long>() { override fun getItemDetails(e: MotionEvent): ItemDetails<Long>? = recyclerView.findChildViewUnder( e.x, e.y )?.let { (recyclerView.getChildViewHolder(it) as? BookViewHolder)?.getItemIdDetails() } } ୈࡾҾ਺ͩͬͨ#PPL*E%FUBJMT-PPLVQͷ࣮૷ɻ
    λονΠϕϯτͷ࠲ඪ͔Βɺ֘౰ͷΞΠςϜΛฦ͚ͩ͢ ͷγϯϓϧͳ࣮૷ɻ
20. © DMM.com X ͜͜·Ͱ࣮૷ͨ͠΋ͷΛݟͯΈΔ
21. © DMM.com X 7JFXʹબ୒ঢ়ଶ͔Ͳ͏͔Λ൓ө͢Δ class BookAdapter( context: Context, private val bookList: List<Book> ) : RecyclerView.Adapter<BookViewHolder>() { ɿ override fun onBindViewHolder( holder: BookViewHolder, position: Int ) { val item = bookList[position] holder.bind( selectionChecker?.isSelected(item.id) ?: false, position, bookList[position] ) } } TFMFDUPSΛηοτ͓͍ͯͯ͠4FMFDUJPO5SBDLFSJT4FMFDUFEͷ݁ՌΛ 7JFXTFU"DUJWBUFEͰηοτ͢Δɻ
22. © DMM.com X 7JFXʹબ୒ঢ়ଶ͔Ͳ͏͔Λ൓ө͢Δ class BookAdapter( context: Context, private val bookList: List<Book> ) : RecyclerView.Adapter<BookViewHolder>() { ɿ override fun onBindViewHolder( holder: BookViewHolder, position: Int ) { val item = bookList[position] holder.bind( selectionChecker?.isSelected(item.id) ?: false, position, bookList[position] ) } } TFMFDUPSΛηοτ͓͍ͯͯ͠4FMFDUJPO5SBDLFSJT4FMFDUFEͷ݁ՌΛ 7JFXTFU"DUJWBUFEͰηοτ͢Δɻ
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