Transition animations in Android Kotlin - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ ui_behavior

intermediate

What is the output of this transition animation code?

Consider this Kotlin code snippet for an Android app that starts a new activity with a fade animation. What will the user see when the new activity starts?

Android Kotlin

val intent = Intent(this, SecondActivity::class.java)
startActivity(intent)
overridePendingTransition(android.R.anim.fade_in, android.R.anim.fade_out)

A The new activity zooms in while the old activity zooms out.

B The new activity slides in from the right while the old activity slides out to the left.

C No animation occurs; the new activity appears instantly.

D The new activity fades in smoothly while the old activity fades out.

💡 Hint

Look at the animation resource IDs used in overridePendingTransition.

The android.R.anim.fade_in and fade_out resources create a smooth fade transition between activities.

❓ lifecycle

intermediate

When does the transition animation start in the activity lifecycle?

In Android, at which point in the activity lifecycle does the transition animation triggered by overridePendingTransition() begin?

A Immediately after startActivity() is called, before onCreate() of the new activity.

B After the new activity's onResume() method completes.

C During the new activity's onCreate() method execution.

D After the new activity's onStart() method but before onResume().

💡 Hint

Think about when the system switches the UI to the new activity.

The transition animation starts immediately after startActivity() is called, before the new activity's onCreate() method.

🔧 Debug

advanced

Why does this transition animation not work as expected?

This code is intended to slide the new activity in from the right, but the animation does not run. What is the problem?

Android Kotlin

val intent = Intent(this, NextActivity::class.java)
startActivity(intent)
overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left)

A overridePendingTransition must be called before startActivity.

B The animation resource files slide_in_right and slide_out_left are missing or incorrectly defined.

C The intent is missing flags to enable animation.

D The activity theme disables animations by default.

💡 Hint

Check if the animation resource files exist and are valid XML.

If the animation XML files are missing or invalid, the animation will not run and the transition will be instant.

❓ navigation

advanced

How to apply a shared element transition between two activities?

You want to animate an image smoothly from one activity to another using a shared element transition. Which code snippet correctly starts the new activity with this transition?

A

val options = ActivityOptionsCompat.makeSceneTransitionAnimation(this, imageView, "imageTransition")
startActivity(intent, options.toBundle())

B

startActivity(intent)
overridePendingTransition(R.anim.shared_enter, R.anim.shared_exit)

C

startActivity(intent)
window.setEnterTransition(TransitionInflater.from(this).inflateTransition(R.transition.shared_element))

D

val options = ActivityOptions.makeCustomAnimation(this, R.anim.shared_enter, R.anim.shared_exit)
startActivity(intent, options.toBundle())

💡 Hint

Shared element transitions require passing the shared view and a transition name.

ActivityOptionsCompat.makeSceneTransitionAnimation with the shared view and transition name enables the shared element animation.

🧠 Conceptual

expert

What is the effect of calling overridePendingTransition(0, 0)?

In an Android app, what happens if you call overridePendingTransition(0, 0) immediately after startActivity()?

A The app crashes because 0 is not a valid animation resource.

B The system uses default slide animations for the transition.

C No animation plays; the new activity appears instantly without any transition effect.

D The previous activity fades out but the new activity does not fade in.

💡 Hint

0 means no animation resource is specified.

Passing 0 for both enter and exit animations disables the transition animations, so the switch is instant.