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GDG Android - Android Adapter 어떻게 사용하는게 좋을까?
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TaeHwan
February 03, 2018
Programming
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GDG Android - Android Adapter 어떻게 사용하는게 좋을까?
2018/02/02 GDG Android Lightning Talk Announcement
TaeHwan
February 03, 2018
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Transcript
Adapter যڌѱ Ӕೞݶ જਸө? Taehwan
ViewModel ਊೞৈ ܻ࠙ೞӝ
ೞ݅ ৈӝࢲࠗఠ द — SeongUg Steve Jung(GDE) : Adapter, ־ҳջ
ք? — Data? View?
Adapter ۧѱ ҳࢿغযભ?
ۧѱ ࢎਊೞભ? class SimpleAdapter(private val context: Context, private val list:
ArrayList<String>) : RecyclerView.Adapter<SimpleAdapter.ViewHolder>() { override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): SimpleAdapter.ViewHolder { return ViewHolder(LayoutInflater.from(context).inflate(R.layout.item_text_sample, parent)) } override fun getItemCount() = list.size override fun onBindViewHolder(holder: SimpleAdapter.ViewHolder?, position: Int) { holder?.itemView?.run { tv_message.text = "Set TEXT" } } class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) }
N ѐ ViewHolderо ਃೞ class ViewHolderOne(itemView: View) : RecyclerView.ViewHolder(itemView) class
ViewHolderTwo(itemView: View) : RecyclerView.ViewHolder(itemView) class ViewHolderThree(itemView: View) : RecyclerView.ViewHolder(itemView)
N ѐ ViewHolderо ਃೞ class SimpleAdapter(private val context: Context, private
val list: ArrayList<String>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() { override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int): RecyclerView.ViewHolder { return when (viewType) { TYPE_ONE -> ViewHolderOne(LayoutInflater.from(context).inflate(R.layout.item_text_sample, parent)) } } override fun onBindViewHolder(holder: RecyclerView.ViewHolder?, position: Int) { when (holder) { is ViewHolderOne -> { holder.itemView?.run { tv_message.text = "ViewHolder One" } } } } override fun getItemViewType(position: Int): Int { return when (position) { else -> TYPE_ONE } } }
ViewHolder по ܻೞب۾ abstract class BaseViewHolder<in ITEM : Any>( val
context: Context, @LayoutRes layoutRes: Int, parent: ViewGroup?) : RecyclerView.ViewHolder(LayoutInflater.from(context).inflate(layoutRes, parent, false)) { fun onBindViewHolder(item: Any?) { try { onViewCreated(item as? ITEM?) } catch (e: Exception) { itemView.visibility = View.GONE } } abstract fun onViewCreated(item: ITEM?) }
BaseRecyclerAdapterীࢲب ਃۧѱ abstract class BaseRecyclerAdapter(val context: Context?) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
override fun onBindViewHolder(holder: RecyclerView.ViewHolder?, position: Int) { (holder as? BaseViewHolder<*>)?.onBindViewHolder(getItem(position)) } // ࢤۚ }
MVP ܻ࠙о оמೠо? थש Ӗী ٮܲ ܻ࠙ — ViewHolder :
Viewਸ Ӓܻח ೡ݅ — View : Viewী ೠ interface — Model : Modelী ೠ interface -> Adapter : ୡӝച ߂ View/Model interface ࢚ࣘਸ ҳഅ -> ৻ࠗ Presenterীࢲ пп interface ഐ
ܻ࠙о оמೠо? interface ImageViewAdapterContract { interface View { val onItemTouchListener:
OnItemTouchListener? fun reload() } interface Model { fun addItem(item: RecentPhotoItem?) fun getItem(position: Int): RecentPhotoItem fun clear() } }
ܻ࠙о оמೠо? class ImageAdapter(private val context: Context) : RecyclerView.Adapter<BaseViewHolder<RecentPhotoItem>>(), ImageViewAdapterContract.View,
ImageViewAdapterContract.Model { val itemList: ArrayList<RecentPhotoItem> = ArrayList() override fun onCreateViewHolder(parent: ViewGroup?, viewType: Int) = when (viewType) { VIEW_TYPE_ASYNC -> ImageAsyncViewHolder(context, parent, onItemTouchListener) } override fun onBindViewHolder(holder: BaseViewHolder<RecentPhotoItem>?, position: Int) { holder?.bindView(getItem(position), position) } override fun getItemViewType(position: Int) = getItem(position).viewType override fun addItem(item: RecentPhotoItem?) { item?.let { itemList.add(it) } } override fun getItem(position: Int) = itemList[position] override fun reload() { notifyDataSetChanged() } }
Ӓ۞ݶ ViewModel۽ ֈযо ࠁ
ViewModelਸ بੑ೧ࠅө? — ѱ ׳ۄח ࠗ࠙ হ݅ ViewModel۽ ҳࢿೞҊ र
— Adapterীࢲח onCreateViewHolder݅ ೞҊ र — BaseAdapter ݅ ੜ೧ࢲ ܻೞҊ र — Modelਸ ߹ب۽ ҙܻೠ -> Adapter ೡ ߹Ѣ হ
ViewModel ੌױ ٜ݅ interface BaseAdapterNavigator { fun getItemViewType(position: Int): Int
fun addItem(item: Any?, viewType: Int) fun clear() fun getItemCount(): Int }
ViewModel ੌױ ٜ݅ open class BaseAdapterViewModel(override val context: Context?) :
BaseAdapterNavigator { protected val itemList = mutableListOf<Pair<Any?, ViewHolderSealedData>>() override fun getItemViewType(position: Int): Int { val item = getPairItem(position) return when (item) { is ViewHolderInfo -> item.viewType else -> -1 } } override fun addItem(item: Any?, viewType: Int) { itemList.add(Pair(item, ViewHolderInfo(viewType))) } override fun clear() { itemList.clear() } override fun getItemCount() = itemList.size }
item ਬোೠ ࢎਊਸ ਤ೧ ViewType/ӝఋ ࠁܳ ਬোೞѱ о۰Ҋ, ইې sealed
class sealed class ViewHolderSealedData data class ViewHolderInfo( val viewType: Int) : ViewHolderSealedData()
Adapterীࢲ Model ܳ ܻ࠙ — Adapterীࢲ Model ܻ࠙ —
Adapterח ԇؘӝܳ ࢤࢿೞח ೡ ࠗ (onCreateViewHolder) — ViewHolderীࢲب BaseAdapterNavigatorਸ ా೧ࢲ Ӕ — ߡౡ ܼ द Navigator ܳ ా೧ Ӕ — ਃী ٮۄ Adapter ӝࠄ ViewModel ೧ࢲ ࢎਊ
Adapter ୡӝചח? private val adapter: BaseRecyclerAdapter by lazy { object
: BaseRecyclerAdapter(this, BaseAdapterViewModel(this)) { override fun onCreateViewHolder( parent: ViewGroup?, viewType: Int): RecyclerView.ViewHolder { // ࢤۚ } } }
؊ જ ߑध Adapter Ӕߨ? — Adapter ࢚ࣘ ҳഅਸ ୭ࣗച
दఃӝ ਤೣ — ViewModel ୡӝച݅ ೞৈ ࢎਊ оמ — ViewHolderীࢲח View ೡ݅ ೞب۾ ܻ -> ߈ࠂ ٬ਸ ӝ ਤೣ