SortedListAdapterCallback

Kotlin |Java

abstract class SortedListAdapterCallback<T2 : Any!> : SortedList.Callback<T2>

kotlin.Any
↳	androidx.recyclerview.widget.SortedList.Callback<T2>
	↳	androidx.recyclerview.widget.SortedListAdapterCallback

Summary

Public constructors
`<init>(adapter: RecyclerView.Adapter<RecyclerView.ViewHolder!>!)` Creates a `SortedList.Callback` that will forward data change events to the provided Adapter.

Public methods
open Unit	`onChanged(position: Int, count: Int)`
open Unit	`onChanged(position: Int, count: Int, payload: Any?)`
open Unit	`onInserted(position: Int, count: Int)`
open Unit	`onMoved(fromPosition: Int, toPosition: Int)`
open Unit	`onRemoved(position: Int, count: Int)`

From class Callback

`Boolean`	`areContentsTheSame(oldItem: T2, newItem: T2)` Called by the SortedList when it wants to check whether two items have the same data or not. SortedList uses this information to decide whether it should call `onChanged(int, int)` or not. SortedList uses this method to check equality instead of `Object#equals(Object)` so that you can change its behavior depending on your UI. For example, if you are using SortedList with a `RecyclerView.Adapter`, you should return whether the items' visual representations are the same or not.
`Boolean`	`areItemsTheSame(item1: T2, item2: T2)` Called by the SortedList to decide whether two objects represent the same Item or not. For example, if your items have unique ids, this method should check their equality.
`Int`	`compare(o1: T2, o2: T2)` Similar to `java.util.Comparator#compare(Object, Object)`, should compare two and return how they should be ordered.
`Any?`	`getChangePayload(item1: T2, item2: T2)` When `areItemsTheSame(T2, T2)` returns `true` for two items and `areContentsTheSame(T2, T2)` returns false for them, `Callback` calls this method to get a payload about the change. For example, if you are using `Callback` with `RecyclerView`, you can return the particular field that changed in the item and your `ItemAnimator` can use that information to run the correct animation. Default implementation returns `null`.

From class ListUpdateCallback

Unit

onInserted(position: Int, count: Int)

Called when count number of items are inserted at the given position.

Unit

onMoved(fromPosition: Int, toPosition: Int)

Called when an item changes its position in the list.

Unit

onRemoved(position: Int, count: Int)

Called when count number of items are removed from the given position.

SortedListAdapterCallback(adapter: RecyclerView.Adapter<RecyclerView.ViewHolder!>!)

Creates a SortedList.Callback that will forward data change events to the provided Adapter.

Parameters
`adapter`	RecyclerView.Adapter<RecyclerView.ViewHolder!>!: The Adapter instance which should receive events from the SortedList.

open fun onChanged(position: Int, count: Int): Unit

open fun onChanged(position: Int, count: Int, payload: Any?): Unit

open fun onInserted(position: Int, count: Int): Unit

open fun onMoved(fromPosition: Int, toPosition: Int): Unit

open fun onRemoved(position: Int, count: Int): Unit