Lesson 7: Activity and fragment lifecycles

1. Your app contains a physics simulation that requires heavy computation to display. 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.

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

   onDestroy()

   onStop()

   onPause()

   onSaveInstanceState()

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

   Lifecycle

   LifecycleOwner

   Lifecycle.Event

   LifecycleObserver

4. Under which circumstances does the onCreate() method in your activity receive a Bundle with data in it (that is, the Bundle is not null)?

   The activity is restarted after the device is rotated.

   The activity is started from scratch.

   The activity is resumed after returning from the background.

   The device is rebooted.

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

   onPause()

   onVisible()

   onStart()

   onDestroy()

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

   onResume()

   onVisible()

   onStart()

   onFocus()

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