# FragmentManager.OnBackStackChangedListener

Added in[API level 11](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Deprecated in[API level 28](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  
Summary:[Methods](https://developer.android.com/reference/android/app/FragmentManager.OnBackStackChangedListener#pubmethods)  

# FragmentManager.OnBackStackChangedListener

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[Kotlin](https://developer.android.com/reference/kotlin/android/app/FragmentManager.OnBackStackChangedListener "View this page in Kotlin")\|Java

`
public
static


interface
FragmentManager.OnBackStackChangedListener
`  
`


`

|--------------------------------------------------------|
| android.app.FragmentManager.OnBackStackChangedListener |

|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Known indirect subclasses [FragmentBreadCrumbs](https://developer.android.com/reference/android/app/FragmentBreadCrumbs) |------------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------| | [FragmentBreadCrumbs](https://developer.android.com/reference/android/app/FragmentBreadCrumbs) | *This class was deprecated in API level 21. This widget is no longer supported.* | |

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**This interface was deprecated in API level 28.**   
Use the[Support Library](https://developer.android.com/tools/extras/support-library)[FragmentManager.OnBackStackChangedListener](https://developer.android.com/reference/androidx/fragment/app/FragmentManager.OnBackStackChangedListener.html)

Interface to watch for changes to the back stack.

## Summary

|                                                                                                     ### Public methods                                                                                                     ||
|------------------|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` abstract void` | ` `[onBackStackChanged](https://developer.android.com/reference/android/app/FragmentManager.OnBackStackChangedListener#onBackStackChanged())`() ` Called whenever the contents of the back stack change. |

## Public methods

### onBackStackChanged

Added in[API level 11](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)  

```
public abstract void onBackStackChanged ()
```

Called whenever the contents of the back stack change.

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