{"id":455056,"date":"2025-04-07T21:00:08","date_gmt":"2025-04-07T21:00:08","guid":{"rendered":"http:\/\/savepearlharbor.com\/?p=455056"},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-29T21:00:00","slug":"","status":"publish","type":"post","link":"https:\/\/savepearlharbor.com\/?p=455056","title":{"rendered":"\u041f\u043e\u0447\u0435\u043c\u0443 \u043d\u0435\u043b\u044c\u0437\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c RecyclerView \u0432 NestedScrollView \u0438 \u043a\u0430\u043a \u044d\u0442\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c?<\/span>"},"content":{"rendered":"
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\u0427\u0442\u043e\u0431\u044b \u043e\u0442\u0432\u0435\u0442\u0438\u0442\u044c \u043d\u0430\u00a0\u044d\u0442\u043e\u0442 \u0432\u043e\u043f\u0440\u043e\u0441, \u0441\u043d\u0430\u0447\u0430\u043b\u0430 \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u043d\u044f\u0442\u044c \u043a\u0430\u043a\u00a0\u0440\u0430\u0431\u043e\u0442\u0430\u0435\u0442 RecyclerView. \u0423\u00a0Recycler \u0435\u0441\u0442\u044c ViewHolder’\u044b, \u0447\u0430\u0441\u0442\u044c \u0438\u0437\u00a0\u043d\u0438\u0445 \u0432\u0438\u0434\u043d\u044b, \u0430\u00a0\u0434\u0440\u0443\u0433\u0438\u0435 \u0434\u0432\u0430 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044c \u043d\u0435\u00a0\u0432\u0438\u0434\u0438\u0442. \u041e\u0434\u0438\u043d \u0440\u0430\u0441\u043f\u043e\u043b\u043e\u0436\u0435\u043d \u0441\u0432\u0435\u0440\u0445\u0443, \u0432\u0442\u043e\u0440\u043e\u0439 \u0441\u043d\u0438\u0437\u0443. \u041f\u0440\u0438\u00a0\u043f\u0440\u043e\u043a\u0440\u0443\u0442\u043a\u0438 \u0441\u043f\u0438\u0441\u043a\u0430, \u0441\u0442\u0430\u0440\u044b\u0435 ViewHolder’\u044b \u043c\u0435\u043d\u044f\u044e\u0442\u0441\u044f \u043d\u0430\u00a0\u043d\u043e\u0432\u044b\u0435, \u043f\u043e\u0442\u043e\u043c\u0443 \u0447\u0442\u043e\u00a0\u0432\u00a0\u0430\u0434\u0430\u043f\u0442\u0435\u0440\u0435 \u0441\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0435\u0442 onBindViewHolder.<\/p>\n

\u041f\u043e\u043f\u0440\u043e\u0431\u0443\u0435\u043c \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u044d\u043a\u0440\u0430\u043d \u0441\u043e \u0441\u043f\u0438\u0441\u043a\u043e\u043c \u0446\u0438\u0444\u0440.<\/p>\n

<?xml version=\"1.0\" encoding=\"utf-8\"?> <androidx.constraintlayout.widget.ConstraintLayout      xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"     xmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"     android:layout_width=\"match_parent\"     android:layout_height=\"match_parent\">      <androidx.recyclerview.widget.RecyclerView         android:id=\"@+id\/recyclerView\"         android:layout_width=\"match_parent\"         android:layout_height=\"match_parent\"         app:layoutManager=\"androidx.recyclerview.widget.LinearLayoutManager\" \/>  <\/androidx.constraintlayout.widget.ConstraintLayout><\/code><\/pre>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?> <FrameLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"     android:layout_width=\"match_parent\"     android:layout_height=\"wrap_content\">      <TextView         android:id=\"@+id\/tvName\"         android:layout_width=\"match_parent\"         android:layout_height=\"wrap_content\"         android:padding=\"10dp\"         android:layout_gravity=\"center_horizontal\"\/>      <View         android:layout_width=\"match_parent\"         android:layout_height=\"1dp\"         android:background=\"@color\/gray\"\/>  <\/FrameLayout><\/code><\/pre>\n
\u0422\u0430\u043a\u0436\u0435 \u043d\u0443\u0436\u043d\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c \u0430\u0434\u0430\u043f\u0442\u0435\u0440.<\/p>\n
class CustomAdapter() : RecyclerView.Adapter<CustomAdapter.CustomViewHolder>() {     private var data: List<Int> = listOf()       inner class CustomViewHolder(private val binding: ItemRvBinding) :         RecyclerView.ViewHolder(binding.root) {         fun onBind(value: Int) {             binding.tvName.text = value.toString()         }     }      override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): CustomViewHolder {         return CustomViewHolder(             ItemRvBinding.inflate(                 LayoutInflater.from(parent.context),                 parent,                 false             )         )     }      override fun getItemCount(): Int {         return data.size     }      override fun onBindViewHolder(holder: CustomViewHolder, position: Int) {         holder.onBind(data[position])     }      fun setList(list: List<Int>) {         data = list         notifyDataSetChanged()     } }<\/code><\/pre>\n
setList \u043d\u0435\u043b\u044c\u0437\u044f \u0442\u0430\u043a \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c, \u044f \u043d\u0430\u043f\u0438\u0441\u0430\u043b \u043d\u0435\u00a0\u043e\u043f\u0442\u0438\u043c\u0430\u043b\u044c\u043d\u044b\u0439 \u0441\u043f\u043e\u0441\u043e\u0431 \u0434\u043b\u044f\u00a0\u043f\u0440\u043e\u0441\u0442\u043e\u0442\u044b \u043f\u043e\u043d\u0438\u043c\u0430\u044f. \u0412\u00a0\u043d\u0430\u0441\u0442\u043e\u044f\u0449\u0438\u0445 \u043f\u0440\u043e\u0435\u043a\u0442\u0430\u0445 \u043d\u0443\u0436\u043d\u043e \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c\u0441\u044f DiffUtil.<\/p>\n
class MainActivity : AppCompatActivity() {     private lateinit var binding: ActivityMainBinding      override fun onCreate(savedInstanceState: Bundle?) {         super.onCreate(savedInstanceState)         binding = ActivityMainBinding.inflate(layoutInflater)         setContentView(binding.root)          val adapter = CustomAdapter()         binding.recyclerView.adapter = adapter          binding.recyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {             override fun onScrollStateChanged(recyclerView: RecyclerView, newState: Int) {                 Log.d(                     \"COUNT_VISIBLE_ITEM\",                     binding.recyclerView.layoutManager?.childCount.toString()                 )                 super.onScrollStateChanged(recyclerView, newState)             }              override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {                 super.onScrolled(recyclerView, dx, dy)             }         })          val list = mutableListOf<Int>()         for (i in 1..1000) {             list.add(i)         }          adapter.setList(list)     } }<\/code><\/pre>\n
\u041d\u0430\u00a0recyclerView \u044f \u043f\u043e\u0441\u0442\u0430\u0432\u0438\u043b addOnScrollListener, \u0447\u0442\u043e\u0431\u044b \u043e\u043d \u0432\u044b\u0432\u043e\u0434\u0438\u043b \u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e ViewHolder’\u043e\u0432 \u043f\u0440\u0438\u00a0\u043a\u0430\u0436\u0434\u043e\u0439 \u043f\u0440\u043e\u043a\u0440\u0443\u0442\u043a\u0435.<\/p>\n
\u0417\u0430\u043f\u0443\u0441\u043a\u0430\u0435\u043c \u043f\u0440\u043e\u0435\u043a\u0442, \u0438 \u0441\u043c\u043e\u0442\u0440\u0438\u043c \u043b\u043e\u0433\u0438. \u0427\u0438\u0441\u043b\u043e ViewHolder’\u043e\u0432 \u0432\u0430\u0440\u044c\u0438\u0440\u0443\u0435\u0442\u0441\u044f \u043e\u0442 22\u00a0\u0434\u043e 23.<\/p>\n
\u0422\u0435\u043f\u0435\u0440\u044c \u043a\u00a0\u043d\u0430\u043c \u043f\u0440\u0438\u0445\u043e\u0434\u0438\u0442 \u0434\u0438\u0437\u0430\u0439\u043d\u0435\u0440, \u0438 \u0433\u043e\u0432\u043e\u0440\u0438\u0442, \u0447\u0442\u043e\u00a0\u0441\u0432\u0435\u0440\u0445\u0443 \u043d\u0430\u043c \u043d\u0443\u0436\u043d\u0430 \u043f\u043b\u0430\u0448\u043a\u0430, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0441\u043a\u0440\u043e\u043b\u0438\u0442\u044c\u0441\u044f.<\/p>\n
<\/figure>\n
<?xml version=\"1.0\" encoding=\"utf-8\"?> <androidx.constraintlayout.widget.ConstraintLayout      xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"     xmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"     android:layout_width=\"match_parent\"     android:layout_height=\"match_parent\">      <androidx.core.widget.NestedScrollView         android:layout_width=\"match_parent\"         android:layout_height=\"match_parent\"         android:orientation=\"vertical\">           <LinearLayout             android:layout_width=\"match_parent\"             android:layout_height=\"match_parent\"             android:orientation=\"vertical\">              <ImageView                 android:layout_width=\"200dp\"                 android:layout_height=\"200dp\"                 android:layout_gravity=\"center_horizontal\"                 android:layout_marginTop=\"8dp\"                 android:src=\"@drawable\/ic_github\" \/>              <TextView                 android:layout_width=\"match_parent\"                 android:layout_height=\"wrap_content\"                 android:layout_marginTop=\"8dp\"                 android:gravity=\"center_horizontal\"                 android:text=\"@string\/name\"                 android:textColor=\"@color\/black\"                 android:textSize=\"20sp\"                 android:textStyle=\"bold\" \/>              <androidx.recyclerview.widget.RecyclerView                 android:id=\"@+id\/recyclerView\"                 android:layout_width=\"match_parent\"                 android:layout_height=\"match_parent\"                 android:layout_marginTop=\"16dp\"                 app:layoutManager=\"androidx.recyclerview.widget.LinearLayoutManager\" \/>           <\/LinearLayout>     <\/androidx.core.widget.NestedScrollView> <\/androidx.constraintlayout.widget.ConstraintLayout><\/code><\/pre>\n
\u041f\u043e\u043b\u0443\u0447\u0430\u0435\u0442\u0441\u044f \u0447\u0442\u043e\u2011\u0442\u043e \u0432\u043e\u0442 \u0442\u0430\u043a\u043e\u0435. \u041d\u043e\u00a0\u0437\u0430\u0439\u0434\u044f \u0432\u00a0\u043b\u043e\u0433\u0438, \u043c\u043e\u0436\u043d\u043e \u0443\u0432\u0438\u0434\u0435\u0442\u044c \u0443\u0436\u0430\u0441\u0430\u044e\u0449\u0443\u044e \u043d\u0430\u0434\u043f\u0438\u0441\u044c.
COUNT_VISIBLE_ITEM habr_tests D 1000\u00a0<\/p>\n
\u0422\u0430\u043a \u043a\u0430\u043a\u00a0RecyclerView \u043d\u0430\u0445\u043e\u0434\u0438\u0442\u044c\u0441\u044f \u0432\u00a0NestedScrollView, \u0435\u0433\u043e \u0440\u0430\u0437\u043c\u0435\u0440 \u043f\u043e\u00a0\u0432\u0435\u0440\u0442\u0438\u043a\u0430\u043b\u0438 \u0440\u0430\u0441\u0442\u044f\u0433\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u043d\u0430\u00a0\u0432\u0435\u0441\u044c \u044d\u043a\u0440\u0430\u043d. \u0418\u0437\u2011\u0437\u0430 \u044d\u0442\u043e\u0433\u043e \u043e\u0442\u0440\u0438\u0441\u043e\u0432\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u0441\u0440\u0430\u0437\u0443 \u0432\u0441\u0435 ViewHolder’\u044b, \u0438 \u0442\u0435\u043b\u0435\u0444\u043e\u043d\u0443 \u043d\u0430\u043a\u043b\u0430\u0434\u043d\u043e \u0432\u0441\u0435 \u044d\u0442\u043e \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u0442\u044c. \u041c\u043e\u0436\u043d\u043e \u0443\u0432\u0438\u0434\u0435\u0442\u044c \u043b\u0430\u0433\u0438, \u0435\u0441\u043b\u0438\u00a0\u043b\u0438\u0441\u0442\u0430\u0442\u044c \u0442\u0430\u043a\u043e\u0439 \u0441\u043f\u0438\u0441\u043e\u043a. \u0422\u0430\u043a \u0434\u0435\u043b\u0430\u0442\u044c \u043d\u0435\u043b\u044c\u0437\u044f. \u041d\u043e\u00a0\u043a\u0430\u043a\u00a0\u044d\u0442\u043e \u0438\u0441\u043f\u0440\u0430\u0432\u0438\u0442\u044c?<\/p>\n
\u0415\u0441\u0442\u044c \u0434\u0432\u0430 \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430, \u043a\u0430\u043a\u00a0\u043c\u043e\u0436\u043d\u043e \u0441\u0434\u0435\u043b\u0430\u0442\u044c. <\/p>\n