# onConfigurationChanged

> A callback to detect the device configuration changes when the application is running.

## Definition

* **Type:** Event
* **Namespace:** [UnityEngine.Android](/engine/6000.7/script-reference/unityengine/android.md)
* **Assembly:** UnityEngine.AndroidJNIModule

```csharp
public static event Action<AndroidConfiguration> onConfigurationChanged
```

### Remarks

Unity invokes this callback for the configuration changes related to the following aspects.

* Orientation

* Keyboard visibility

* Dark theme

* Screen layout

* Screen size

For more information on the configuration changes, refer to the [Android developer documentation](https://developer.android.com/guide/topics/resources/runtime-changes).

### Examples

```csharp
using UnityEngine;
using UnityEngine.Android;

public class MyApplication : MonoBehaviour
{
    AndroidConfiguration m_PrevConfig;

    public void Start()
    {
        m_PrevConfig = new AndroidConfiguration(AndroidApplication.currentConfiguration);
        AndroidApplication.onConfigurationChanged += OnConfigurationChanged;
    }

    public void OnDisable()
    {
        AndroidApplication.onConfigurationChanged -= OnConfigurationChanged;
    }

    private void OnConfigurationChanged(AndroidConfiguration newConfig)
    {
        if (m_PrevConfig.orientation != newConfig.orientation ||
            m_PrevConfig.screenLayoutSize != newConfig.screenLayoutSize)
        {
            ApplyUIChanges(newConfig.orientation, newConfig.screenLayoutSize);
        }

        if (m_PrevConfig.uiModeNight != newConfig.uiModeNight)
        {
            ApplyUINightMode(newConfig.uiModeNight);
        }

        if (m_PrevConfig.screenHeightDp != newConfig.screenHeightDp ||
            m_PrevConfig.screenWidthDp != newConfig.screenWidthDp)
        {
            ApplyScreenSizeChanges();
        }

        m_PrevConfig.CopyFrom(newConfig);
    }

    private void ApplyUIChanges(AndroidOrientation orientation, AndroidScreenLayoutSize layoutSize)
    {

    }

    private void ApplyUINightMode(AndroidUIModeNight nightMode)
    {

    }

    private void ApplyScreenSizeChanges()
    {

    }
}
```