# UiModeManager.ContrastChangeListener

Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)

# ContrastChangeListener

*** ** * ** ***

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

```
interface ContrastChangeListener
```

|------------------------------------------------------------------------------------------------------------------------------------------------------|
| [android.app.UiModeManager.ContrastChangeListener](https://developer.android.com/reference/kotlin/android/app/UiModeManager.ContrastChangeListener#) |

Listener for the UI contrast. To listen for changes to the UI contrast on the device, implement this interface and register it with the system by calling[addContrastChangeListener](https://developer.android.com/reference/kotlin/android/app/UiModeManager#addContrastChangeListener(java.util.concurrent.Executor,%20android.app.UiModeManager.ContrastChangeListener)).

## Summary

|                                                                                                                                                                                          Public methods                                                                                                                                                                                          ||
|--------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| abstract[Unit](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) | [onContrastChanged](https://developer.android.com/reference/kotlin/android/app/UiModeManager.ContrastChangeListener#onContrastChanged(kotlin.Float))`(`contrast:` `[Float](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-float/index.html)`)` Called when the color contrast enabled state changes. |

## Public methods

### onContrastChanged

Added in[API level 34](https://developer.android.com/guide/topics/manifest/uses-sdk-element.html#ApiLevels)  

```
abstract fun onContrastChanged(contrast: Float): Unit
```

Called when the color contrast enabled state changes.

|                                                                                                                            Parameters                                                                                                                             ||
|------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| `contrast` | [Float](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-float/index.html):The color contrast as in[getContrast](https://developer.android.com/reference/kotlin/android/app/UiModeManager#getContrast())Value is between -1.0f and 1.0f inclusive |