OnAppObserver.kt

class OnAppObserver : LifecycleObserver {

    companion object {
        var APP_STATUS: AppStatus = AppStatus.NOTEXECUTE
    }

    enum class AppStatus {
        NOTEXECUTE,
        BACKGROUND,
        FOREGROUND
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_START)
    fun onStart() {
        APP_STATUS = AppStatus.FOREGROUND
    }

    @OnLifecycleEvent(Lifecycle.Event.ON_STOP)
    fun onStop() {
        APP_STATUS = AppStatus.BACKGROUND
    }

}