AdapterDataObserver

Kotlin |Java

abstract class AdapterDataObserver

kotlin.Any
↳	androidx.recyclerview.widget.RecyclerView.AdapterDataObserver

Observer base class for watching changes to an Adapter. See Adapter#registerAdapterDataObserver(AdapterDataObserver).

Summary

Public constructors
`<init>()` Observer base class for watching changes to an `Adapter`.

Public methods
open Unit	`onChanged()`
open Unit	`onItemRangeChanged(positionStart: Int, itemCount: Int)`
open Unit	`onItemRangeChanged(positionStart: Int, itemCount: Int, @Nullable payload: Any?)`
open Unit	`onItemRangeInserted(positionStart: Int, itemCount: Int)`
open Unit	`onItemRangeMoved(fromPosition: Int, toPosition: Int, itemCount: Int)`
open Unit	`onItemRangeRemoved(positionStart: Int, itemCount: Int)`
open Unit	`onStateRestorationPolicyChanged()` Called when the `Adapter.StateRestorationPolicy` of the `Adapter` changed.

Public constructors

<init>

AdapterDataObserver()

Observer base class for watching changes to an Adapter. See Adapter#registerAdapterDataObserver(AdapterDataObserver).

Public methods

onChanged

open fun onChanged(): Unit

onItemRangeChanged

open fun onItemRangeChanged(
    positionStart: Int, 
    itemCount: Int
): Unit

onItemRangeChanged

open fun onItemRangeChanged(
    positionStart: Int, 
    itemCount: Int, 
    @Nullable payload: Any?
): Unit

onItemRangeInserted

open fun onItemRangeInserted(
    positionStart: Int, 
    itemCount: Int
): Unit

onItemRangeMoved

open fun onItemRangeMoved(
    fromPosition: Int, 
    toPosition: Int, 
    itemCount: Int
): Unit

onItemRangeRemoved

open fun onItemRangeRemoved(
    positionStart: Int, 
    itemCount: Int
): Unit

onStateRestorationPolicyChanged

open fun onStateRestorationPolicyChanged(): Unit

Called when the Adapter.StateRestorationPolicy of the Adapter changed. When this method is called, the Adapter might be ready to restore its state if it has not already been restored.

See Also