IApplicationLifecycleHandler 5.4.2 API

```
public interface IApplicationLifecycleHandler

                    
```
Implementations of the application lifecycle handler added via IApplicationService.addApplicationLifecycleHandler will be notified throughout the application lifecycle. This should be used over the Android-provided ActivityLifecycleCallbacks, it provides an abstraction more specific to the OneSignal SDK

Method Summary

Modifier and Type	Method	Description
`abstract Unit`	`onFocus(Boolean firedOnSubscribe)`	Called when the application is brought into the foreground.
`abstract Unit`	`onUnfocused()`	Called when the application has been brought out of the foreground, to the background.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Method Detail
  - onFocus
```
 abstract Unit onFocus(Boolean firedOnSubscribe)
```
    Called when the application is brought into the foreground. This callback can be fired immediately on subscribing to the IApplicationService (when the IApplicationService itself is started too late to capture the application's early lifecycle events), or through natural application lifecycle callbacks.
    
    Parameters:
    
    firedOnSubscribe - Method is fired from subscribing or from application lifecycle callbacks
  - onUnfocused
```
 abstract Unit onUnfocused()
```
    Called when the application has been brought out of the foreground, to the background.