Android
```kotlin
interface OnRegistrationChangedListener
```
Interface to be implemented by components that want to be notified when an [ViewRootForTest](/jetpack-compose/androidx.compose.ui/ui/interfaces/ViewRootForTest)
registers or unregisters at this registry.
## Functions
onRegistrationChanged
```kotlin
fun onRegistrationChanged(composeRoot: ViewRootForTest, registered: Boolean)
```