{"id":301311,"date":"2020-04-05T15:00:15","date_gmt":"2020-04-05T15:00:15","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=301311"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=301311","title":{"rendered":"Prosto: \u0443\u0431\u0438\u0440\u0430\u0435\u043c \u0431\u043e\u0439\u043b\u0435\u0440\u043f\u043b\u0435\u0439\u0442 \u043f\u0440\u0438 \u0440\u0430\u0431\u043e\u0442\u0435 \u0441 RecyclerView"},"content":{"rendered":"\n
\n

\u0414\u043b\u044f \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u044f \u0441\u043f\u0438\u0441\u043a\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u043c\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c RecyclerView<\/code> (\u2013 \u0421\u043f\u0430\u0441\u0438\u0431\u043e, \u043a\u044d\u043f!). \u041e\u043d \u043c\u043d\u043e\u0433\u043e \u0447\u0435\u0433\u043e \u0443\u043c\u0435\u0435\u0442 \u0438\u0437 \u043a\u043e\u0440\u043e\u0431\u043a\u0438 \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 \u0432\u0441\u0435\u043c \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0435 \u0431\u043b\u0430\u0431\u043b\u0430\u0431\u043b\u0430. \u041d\u043e \u0438 \u0431\u043e\u043b\u0438 \u0441 \u043d\u0438\u043c \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e. \u041d\u0438\u043a\u0442\u043e \u043d\u0435 \u043b\u044e\u0431\u0438\u0442 \u043f\u0438\u0441\u0430\u0442\u044c \u043e\u0434\u0438\u043d \u0438 \u0442\u043e\u0442 \u0436\u0435 boilerplate-\u043a\u043e\u0434. \u0418 \u044f \u0432\u043e\u0442 \u043d\u0435 \u043e\u0441\u043e\u0431\u043e…<\/p>\n

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<\/a> <\/p>\n

\u041a\u0440\u0430\u0442\u043a\u0430\u044f \u0438\u0441\u0442\u043e\u0440\u0438\u044f \u0441\u044e\u0436\u0435\u0442\u0430 "\u041d\u0435\u043c\u043d\u043e\u0433\u043e \u0443\u043c\u0435\u043d\u044c\u0448\u0438\u0442\u044c \u043a\u043e\u0434\u0430":
<\/p>\n

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\u0414\u043b\u044f \u043f\u0440\u0438\u043c\u0435\u0440\u0430 \u0441\u043e\u0437\u0434\u0430\u043d \u043f\u0440\u043e\u0441\u0442\u043e\u0439 data class Person(): \u0441 \u0438\u043c\u0435\u043d\u0435\u043c, \u0444\u0430\u043c\u0438\u043b\u0438\u0435\u0439, \u044d\u043b. \u043f\u043e\u0447\u0442\u043e\u0439 \u0438 \u043d\u0430\u043b\u0438\u0447\u0438\u0435\u043c \u0441\u043e\u0431\u0430\u043a\u0438. <\/em><\/p>\n

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\u0427\u0442\u043e\u0431\u044b \u0432\u044b\u0432\u0435\u0441\u0442\u0438 \u043d\u0430 \u044d\u043a\u0440\u0430\u043d \u0441\u043f\u0438\u0441\u043e\u043a \u043b\u044e\u0434\u0435\u0439, \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0441\u043e\u0437\u0434\u0430\u0442\u044c RecyclerView.Adapter<\/code> \u0438 RecyclerView.ViewHolder<\/code>, \u0431\u043e\u043b\u044c\u0448\u0430\u044f \u0447\u0430\u0441\u0442\u044c \u043a\u043e\u0434\u0430 \u043a\u043e\u0442\u043e\u0440\u044b\u0445 +- \u043e\u0434\u0438\u043d\u0430\u043a\u043e\u0432\u0430\u044f. <\/p>\n

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\u0415\u0441\u043b\u0438 \u0443 \u0432\u0430\u0441 \u043e\u0434\u0438\u043d Adapter<\/code> \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u0440\u0430\u0437\u043d\u044b\u0445 ViewHolder<\/code>-\u043e\u0432, \u044d\u0442\u0430 \u0438\u0441\u0442\u043e\u0440\u0438\u044f \u043d\u0435 \u0434\u043b\u044f \u0432\u0430\u0441. \u0412 \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u0435 \u0436\u0435, \u043d\u0430\u0432\u0435\u0440\u043d\u043e\u0435, \u0441\u043b\u0443\u0447\u0430\u0435\u0432 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u043e\u0434\u0438\u043d ViewHolder<\/code>, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043f\u0440\u043e\u0441\u0442\u043e \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0430\u0435\u0442 \u043e\u0434\u043d\u043e\u0442\u0438\u043f\u043d\u044b\u0435 \u0434\u0430\u043d\u043d\u044b\u0435.
\u0414\u043b\u044f \u0442\u0430\u043a\u0438\u0445 \u0441\u043b\u0443\u0447\u0430\u0435\u0432 \u044f \u0441\u0434\u0435\u043b\u0430\u043b \u0431\u0430\u0437\u043e\u0432\u044b\u0439 Adapter<\/code> \u0438 ViewHolder<\/code>, \u0447\u0442\u043e\u0431\u044b \u0438\u0437\u0431\u0430\u0432\u0438\u0442\u044c\u0441\u044f \u043e\u0442 \u0440\u0443\u0442\u0438\u043d\u044b. <\/p>\n

<\/p>\n

\u041e\u0431\u044b\u0447\u043d\u0430\u044f \u0436\u0438\u0437\u043d\u044c \u0441 RecyclerView.Adapter<RecyclerView.ViewHolder><\/h2>\n

<\/p>\n

Adapter \u043a\u043b\u0430\u0441\u0441\u0438\u0447\u0435\u0441\u043a\u0438\u0439. \u041f\u0435\u0440\u0435\u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0431\u0430\u0437\u043e\u0432\u044b\u0445 \u043c\u0435\u0442\u043e\u0434\u043e\u0432, \u043d\u0438\u0447\u0435\u0433\u043e \u043d\u043e\u0432\u043e\u0433\u043e.<\/b><\/p>\n
\n
class ClassicAdapter : RecyclerView.Adapter<ClassicHolder>() {      private val viewModel = PersonItemViewModel()      private val data: List<Person>         get() = viewModel.data      fun setData(persons: List<Person>) {         viewModel.data = persons         notifyDataSetChanged()     }      override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ClassicHolder =         ClassicHolder.create(parent)      override fun getItemCount(): Int = data.size      override fun onBindViewHolder(holder: ClassicHolder, position: Int) {         holder.bind(viewModel, position)     } }<\/code><\/pre>\n<\/div>\n<\/div>\n
  <\/p>\n
ViewHolder \u0443 \u043c\u0435\u043d\u044f \u043d\u0430 MVVM.<\/b><\/p>\n
\n
class ClassicHolder(private val binding: ItemPersonBinding) : RecyclerView.ViewHolder(binding.root) {     fun bind(viewModel: PersonItemViewModel, position: Int) {         binding.setVariable(BR.viewModel, viewModel)         binding.setVariable(BR.position, position)         binding.executePendingBindings()     }      companion object {         fun create(parent: ViewGroup): ClassicHolder {             val inflater = LayoutInflater.from(parent.context)             val binding: ItemPersonBinding =                 DataBindingUtil.inflate(inflater, R.layout.item_person, parent, false)             return ClassicHolder(binding)         }     } }<\/code><\/pre>\n<\/div>\n<\/div>\n
  <\/p>\n
\u0412 item_person.xml \u0443\u043a\u0430\u0437\u044b\u0432\u0430\u0435\u043c \u0432\u0441\u0435 \u043d\u0443\u0436\u043d\u044b\u0435 binding-\u0438: ViewModel \u0441 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0438 Position — \u043f\u043e\u0437\u0438\u0446\u0438\u044f \u044d\u043b\u0435\u043c\u0435\u043d\u0442\u0430 \u0432 RecyclerView.<\/b><\/p>\n
\n
<?xml version="1.0" encoding="utf-8"?> <layout>     <data>         <variable             name="position"             type="Integer" \/>          <variable             name="viewModel"             type="plus.yeti.prostoadapter.ui.main.PersonItemViewModel" \/>     <\/data>      <androidx.constraintlayout.widget.ConstraintLayout>          <TextView             android:text="@{viewModel.getName(position)}"             ... \/>          <TextView             android:text="@{viewModel.getEmail(position)}"             ...\/>          <ImageView             app:visible="@{viewModel.hasDog(position)}"              ...\/>      <\/androidx.constraintlayout.widget.ConstraintLayout> <\/layout><\/code><\/pre>\n<\/div>\n<\/div>\n
  <\/p>\n
PersonItemViewModel \u0434\u043b\u044f \u043f\u043e\u043b\u043d\u043e\u0442\u044b \u043a\u0430\u0440\u0442\u0438\u043d\u044b.<\/b><\/p>\n
\n
class PersonItemViewModel : ProstoViewModel<Person>() {     override var data: List<Person> = emptyList()      fun getName(position: Int) = data[position].lastName + ", " + data[position].firstName     fun getEmail(position: Int) = data[position].email     fun hasDog(position: Int): Boolean = data[position].hasDog }<\/code><\/pre>\n<\/div>\n<\/div>\n
  <\/p>\n
\u0421\u043e\u0437\u0434\u0430\u043d\u0438\u0435 ProstoAdapter<\/code> \u0438 ProstoHolder<\/code><\/h2>\n
  <\/p>\n
\u0418\u0442\u0430\u043a, \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0438\u043c Adapter<\/code> \u0438 ViewHolder<\/code> \u043d\u0430 \u0434\u0436\u0435\u043d\u0435\u0440\u0438\u043a\u0438, \u0438 \u0432\u0441\u0451 \u0440\u0443\u0442\u0438\u043d\u043d\u043e\u0435 \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u0438\u043c \u0432\u043e\u0432\u043d\u0443\u0442\u0440\u044c.<\/p>\n
  <\/p>\n
\u0414\u043b\u044f \u043d\u0430\u0447\u0430\u043b\u0430 \u0441\u0434\u0435\u043b\u0430\u0435\u043c \u0431\u0430\u0437\u043e\u0432\u0443\u044e ProstoViewModel<\/code>. \u0412\u043e\u043e\u0431\u0449\u0435, \u043c\u043e\u0436\u043d\u043e \u043e\u0431\u043e\u0439\u0442\u0438\u0441\u044c \u0438 \u0431\u0435\u0437 \u044d\u0442\u043e\u0439 ProstoViewModel<\/code>, \u043d\u043e, \u0447\u0442\u043e\u0431\u044b \u0432 \u0438\u0442\u043e\u0433\u0435 \u043f\u043e\u043b\u0443\u0447\u0438\u043b\u043e\u0441\u044c \u0441\u043e\u0432\u0441\u0435\u043c \u043a\u0440\u0430\u0441\u0438\u0432\u043e, \u0434\u043e\u0431\u0430\u0432\u0438\u043c \u0438 \u0435\u0451. \u042d\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u0442 \u043d\u0430\u043c \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0442\u044c \u0434\u0430\u043d\u043d\u044b\u0435 \u0432\u043e ViewModel<\/code> \u0431\u0435\u0437 \u043f\u043e\u0441\u0440\u0435\u0434\u043d\u0438\u043a\u0430-\u0430\u0434\u0430\u043f\u0442\u0435\u0440\u0430:<\/p>\n
  <\/p>\n
abstract class ProstoViewModel<T>: ViewModel() {     abstract var data: List<T> }<\/code><\/pre>\n
  <\/p>\n
ProstoHolder<\/code><\/p>\n
  <\/p>\n
open class ProstoHolder<TBinding : ViewDataBinding>(val binding: TBinding) : RecyclerView.ViewHolder(binding.root) {     open fun <TData, TViewModel : ProstoViewModel<TData>> bind(viewModel: TViewModel, position: Int) {         binding.setVariable(BR.viewModel, viewModel)         binding.setVariable(BR.position, position)         binding.executePendingBindings()     }      companion object {         fun <TBinding : ViewDataBinding> create(parent: ViewGroup, layoutId: Int): ProstoHolder<TBinding> {             val inflater = LayoutInflater.from(parent.context)             val binding: TBinding = DataBindingUtil.inflate(inflater, layoutId, parent, false)             return ProstoHolder(binding)         }     } }<\/code><\/pre>\n
  <\/p>\n
\u0438, \u043d\u0430\u043a\u043e\u043d\u0435\u0446, ProstoAdapter<\/code>:<\/p>\n
  <\/p>\n
abstract class ProstoAdapter<TBinding : ViewDataBinding, TData> : RecyclerView.Adapter<ProstoHolder<TBinding>>() {      abstract val viewModel: ProstoViewModel<TData>     abstract val layoutId: Int      private var dataSize: Int = 0      open fun setData(data: List<TData>) {         this.dataSize = data.size         viewModel.data = data         notifyDataSetChanged()     }      open var onBind: ((ProstoHolder<TBinding>) -> Unit)? = null      override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ProstoHolder<TBinding> =         ProstoHolder.create(parent, layoutId)      override fun getItemCount(): Int = dataSize      override fun onBindViewHolder(holder: ProstoHolder<TBinding>, position: Int) {         holder.bind(viewModel, position)         onBind?.invoke(holder)     } }<\/code><\/pre>\n
  <\/p>\n
\u041d\u043e\u0432\u0430\u044f \u0436\u0438\u0437\u043d\u044c<\/h2>\n
  <\/p>\n
\u0414\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u044d\u043a\u0437\u0435\u043c\u043f\u043b\u044f\u0440\u0430 \u043d\u0430\u0448\u0435\u0433\u043e Adapter<\/code>-a \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e \u0443\u043a\u0430\u0437\u0430\u0442\u044c ViewModel<\/code> c \u0434\u0430\u043d\u043d\u044b\u043c\u0438, item’s layout id<\/code> \u0441 \u0435\u0433\u043e \u0442\u0438\u043f\u043e\u043c Binding-\u043a\u043b\u0430\u0441\u0441\u0430, \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0447\u0435\u0441\u043a\u0438 \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 layout<\/code>-\u0430, \u043d\u0443 \u0438 \u0442\u0438\u043f \u0434\u0430\u043d\u043d\u044b\u0445 \u0434\u043b\u044f \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u044f \u043e\u0434\u043d\u043e\u0433\u043e item-\u0430.
  \u0422\u0430\u043a\u0436\u0435 \u0434\u043b\u044f \u0441\u043e\u0437\u0434\u0430\u043d\u0438\u044f \u0430\u0434\u0430\u043f\u0442\u0435\u0440\u0430 \u043d\u0435\u0442 \u043d\u0435\u043e\u0431\u0445\u043e\u0434\u0438\u043c\u043e\u0441\u0442\u0438 \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0442\u044c \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0439 \u043a\u043b\u0430\u0441\u0441, \u043d\u043e \u044d\u0442\u043e \u043f\u043e \u0436\u0435\u043b\u0430\u043d\u0438\u044e \ud83d\ude42<\/p>\n
  <\/p>\n
class MainFragment : Fragment() {     private val adapter =         object : ProstoAdapter<ItemPersonBinding, Person>() {             override val viewModel = PersonItemViewModel()             override val layoutId = R.layout.item_person         }      override fun onActivityCreated(savedInstanceState: Bundle?) {         super.onActivityCreated(savedInstanceState)         mainRecyclerView.adapter = adapter     }      fun setNewPersonList(persons: List<Person>){         adapter.setData(personList)     } }<\/code><\/pre>\n
  <\/p>\n
\u0418\u0442\u043e\u0433\u043e 4 \u0441\u0442\u0440\u043e\u043a\u0438.<\/p>\n
  <\/p>\n
\u041f\u0440\u043e\u0435\u043a\u0442 https:\/\/github.com\/klukwist\/Prosto<\/a><\/p>\n
  <\/p>\n
\u0412 \u043f\u043b\u0430\u043d\u0430\u0445 \u0440\u0430\u0441\u0448\u0438\u0440\u0438\u0442\u044c \u0434\u043e \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u043c\u0438 ViewHolder-\u0430\u043c\u0438.
  \u0412\u0441\u0435\u043c \u0431\u043e\u043b\u044c\u0448\u0435 \u0430\u0432\u0442\u043e\u043c\u0430\u0442\u0438\u0437\u0430\u0446\u0438\u0438 \ud83d\ude42<\/p>\n<\/div>\n
 \u0441\u0441\u044b\u043b\u043a\u0430 \u043d\u0430 \u043e\u0440\u0438\u0433\u0438\u043d\u0430\u043b \u0441\u0442\u0430\u0442\u044c\u0438  https:\/\/habr.com\/ru\/post\/495762\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\n
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\u0414\u043b\u044f \u043e\u0442\u043e\u0431\u0440\u0430\u0436\u0435\u043d\u0438\u044f \u0441\u043f\u0438\u0441\u043a\u0430 \u0434\u0430\u043d\u043d\u044b\u0445 \u043c\u044b \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c RecyclerView<\/code> (\u2013 \u0421\u043f\u0430\u0441\u0438\u0431\u043e, \u043a\u044d\u043f!). \u041e\u043d \u043c\u043d\u043e\u0433\u043e \u0447\u0435\u0433\u043e \u0443\u043c\u0435\u0435\u0442 \u0438\u0437 \u043a\u043e\u0440\u043e\u0431\u043a\u0438 \u0438 \u0434\u0440\u0443\u0433\u0438\u0435 \u0432\u0441\u0435\u043c \u0438\u0437\u0432\u0435\u0441\u0442\u043d\u044b\u0435 \u0431\u043b\u0430\u0431\u043b\u0430\u0431\u043b\u0430. \u041d\u043e \u0438 \u0431\u043e\u043b\u0438 \u0441 \u043d\u0438\u043c \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0442\u043e\u0447\u043d\u043e. \u041d\u0438\u043a\u0442\u043e \u043d\u0435 \u043b\u044e\u0431\u0438\u0442 \u043f\u0438\u0441\u0430\u0442\u044c \u043e\u0434\u0438\u043d \u0438 \u0442\u043e\u0442 \u0436\u0435 boilerplate-\u043a\u043e\u0434. \u0418 \u044f \u0432\u043e\u0442 \u043d\u0435 \u043e\u0441\u043e\u0431\u043e…<\/p>\n
  <\/p>\n
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