Kotlin Fundamentals: Activity and Fragment lifecycles quiz

1. Which of the following is not an activity lifecycle state?

   Started

   Waiting

   Created

   Destroyed

2. Which lifecycle method is called to make an activity visible?

   onPause()

   onVisible()

   onStart()

   onDestroy()

3. Which lifecycle method is called to give an activity focus?

   onResume()

   onVisible()

   onStart()

   onFocus()

4. Your app contains a physics simulation that requires heavy computation to display onscreen. Then the user gets a phone call. Which of the following is true?

   During the phone call, you should continue computing the positions of objects in the physics simulation.

   During the phone call, you should stop computing the positions of objects in the physics simulation.

5. Which lifecycle method should you override to pause the simulation when the app is not on the screen?

   onDestroy()

   onPause()

   onStop()

   onSaveInstanceState()

6. To make a class lifecycle-aware through the Jetpack lifecycle library, which interface should the class implement?

   Lifecycle

   LifecycleOwner

   Lifecycle.Event

   LifecycleObserver

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