PagedList.Callback

Added in 2.0.0

Deprecated in 3.0.0

Kotlin |Java

android
```
abstract class PagedList.Callback
```

Callback signaling when content is loaded into the list.

Can be used to listen to items being paged in and out. These calls will be dispatched on the dispatcher defined by PagedList.Builder.setNotifyDispatcher, which is generally the main/UI thread.

Summary

Public constructors
`Callback()`	android

Public functions
`abstract Unit`	`onChanged(position: Int, count: Int)` Called when null padding items have been loaded to signal newly available data, or when data that hasn't been used in a while has been dropped, and swapped back to null.	android
`abstract Unit`	`onInserted(position: Int, count: Int)` Called when new items have been loaded at the end or beginning of the list.	android
`abstract Unit`	`onRemoved(position: Int, count: Int)` Called when items have been removed at the end or beginning of the list, and have not been replaced by padded nulls.	android

Public constructors

Callback

android

Added in 2.0.0

Deprecated in 3.0.0

Callback()

Public functions

onChanged

android

Added in 2.0.0

Deprecated in 3.0.0

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

Called when null padding items have been loaded to signal newly available data, or when data that hasn't been used in a while has been dropped, and swapped back to null.

Parameters
`position: Int`	Position of first newly loaded items, out of total number of items (including padded nulls).
`count: Int`	Number of items loaded.

onInserted

android

Added in 2.0.0

Deprecated in 3.0.0

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

Called when new items have been loaded at the end or beginning of the list.

Parameters
`position: Int`	Position of the first newly loaded item (in practice, either `0` or `size - 1`.
`count: Int`	Number of items loaded.

onRemoved

android

Added in 2.0.0

Deprecated in 3.0.0

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

Called when items have been removed at the end or beginning of the list, and have not been replaced by padded nulls.

Parameters
`position: Int`	Position of the first newly loaded item (in practice, either `0` or `size - 1`.
`count: Int`	Number of items loaded.