Added in [API level 18](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

# ViewTreeObserver.OnWindowAttachListener

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` public static interface ViewTreeObserver.OnWindowAttachListener `   
` `

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| android.view.ViewTreeObserver.OnWindowAttachListener |

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Interface definition for a callback to be invoked when the view hierarchy is attached to and detached from its window.

## Summary

| ### Public methods ||
|---|---|
| ` abstract void` | ` https://developer.android.com/reference/android/view/ViewTreeObserver.OnWindowAttachListener#onWindowAttached()() ` Callback method to be invoked when the view hierarchy is attached to a window |
| ` abstract void` | ` https://developer.android.com/reference/android/view/ViewTreeObserver.OnWindowAttachListener#onWindowDetached()() ` Callback method to be invoked when the view hierarchy is detached from a window |

## Public methods

### onWindowAttached

Added in [API level 18](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public abstract void onWindowAttached ()
```

Callback method to be invoked when the view hierarchy is attached to a window

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### onWindowDetached

Added in [API level 18](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)

```
public abstract void onWindowDetached ()
```

Callback method to be invoked when the view hierarchy is detached from a window

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