# ViewTreeObserver.OnScrollChangedListener

Added in[API level 3](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

# OnScrollChangedListener

*** ** * ** ***

Kotlin\|[Java](https://developer.android.com/reference/android/view/ViewTreeObserver.OnScrollChangedListener "View this page in Java")  

```
interface OnScrollChangedListener
```

|----------------------------------------------------------------------------------------------------------------------------------------------------------------|
| [android.view.ViewTreeObserver.OnScrollChangedListener](https://developer.android.com/reference/kotlin/android/view/ViewTreeObserver.OnScrollChangedListener#) |

Interface definition for a callback to be invoked when something in the view tree has been scrolled.

## Summary

|                                                                                                                                                    Public methods                                                                                                                                                    ||
|--------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| abstract[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onScrollChanged](https://developer.android.com/reference/kotlin/android/view/ViewTreeObserver.OnScrollChangedListener#onScrollChanged())`()` Callback method to be invoked when something in the view tree has been scrolled. |

## Public methods

### onScrollChanged

Added in[API level 3](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
abstract fun onScrollChanged(): Unit
```

Callback method to be invoked when something in the view tree has been scrolled.