SignInStateChangeListener (AWS SDK for Android - AWS Authentication Core 2.7.5 API)

```
public interface SignInStateChangeListener
```
Implement this interface to receive callbacks when the user's sign-in state changes from signed-in to not signed-in or vice versa.

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`void`	`onUserSignedIn()` Invoked when the user completes sign-in.
`void`	`onUserSignedOut()` Invoked when the user signs out.

Interface SignInStateChangeListener