Transition animations in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to start a new activity with a fade transition animation.

Android Kotlin

val intent = Intent(this, SecondActivity::class.java)
startActivity(intent)
overridePendingTransition([1], android.R.anim.fade_out)

Drag options to blanks, or click blank then click option'

Aandroid.R.anim.fade_in

Bandroid.R.anim.slide_in_left

Candroid.R.anim.zoom_in

Dandroid.R.anim.slide_out_right

Attempts:

3 left

💡 Hint

Common Mistakes

Using the exit animation resource as the enter animation.

Choosing slide or zoom animations instead of fade.

Use android.R.anim.fade_in to apply a fade-in animation when starting the new activity.

2fill in blank

medium

Complete the code to apply a slide-in-left animation when finishing the current activity.

Android Kotlin

finish()
overridePendingTransition([1], android.R.anim.slide_out_right)

Drag options to blanks, or click blank then click option'

Aandroid.R.anim.fade_in

Bandroid.R.anim.slide_in_left

Candroid.R.anim.zoom_in

Dandroid.R.anim.fade_out

Attempts:

3 left

💡 Hint

Common Mistakes

Using fade animations instead of slide animations.

Mixing up enter and exit animations.

Use android.R.anim.slide_in_left to slide the new activity in from the left when finishing.

3fill in blank

hard

Fix the error in the code to correctly apply a zoom animation when starting a new activity.

Android Kotlin

val intent = Intent(this, DetailActivity::class.java)
startActivity(intent)
overridePendingTransition([1], android.R.anim.zoom_out)

Drag options to blanks, or click blank then click option'

Aandroid.R.anim.fade_out

Bandroid.R.anim.fade_in

Candroid.R.anim.slide_in_left

Dandroid.R.anim.zoom_in

Attempts:

3 left

💡 Hint

Common Mistakes

Using zoom_out as the enter animation instead of zoom_in.

Using fade or slide animations instead of zoom.

The enter animation should be android.R.anim.zoom_in to zoom in the new activity.

4fill in blank

hard

Fill both blanks to create a custom transition animation when starting an activity.

Android Kotlin

val intent = Intent(this, NextActivity::class.java)
startActivity(intent)
overridePendingTransition([1], [2])

Drag options to blanks, or click blank then click option'

AR.anim.slide_in_right

Bandroid.R.anim.fade_out

CR.anim.slide_out_left

Dandroid.R.anim.fade_in

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up enter and exit animations.

Using system animations instead of custom ones.

Use R.anim.slide_in_right for the enter animation and R.anim.slide_out_left for the exit animation to slide the new activity in from the right and the current activity out to the left.

5fill in blank

hard

Fill all three blanks to create a transition animation with fade in, fade out, and slide out right effects.

Android Kotlin

val intent = Intent(this, FinalActivity::class.java)
startActivity(intent)
overridePendingTransition([1], [2])
finish()
overridePendingTransition([3], android.R.anim.slide_out_right)

Drag options to blanks, or click blank then click option'

Aandroid.R.anim.fade_in

Bandroid.R.anim.fade_out

Candroid.R.anim.slide_in_left

Dandroid.R.anim.zoom_in

Attempts:

3 left

💡 Hint

Common Mistakes

Using the same animation for enter and exit.

Confusing the order of animations.

First, use fade_in and fade_out when starting the activity. Then, when finishing, use slide_in_left and slide_out_right for the exit transition.

Practice

1. What is the main purpose of using overridePendingTransition in Android Kotlin apps?

easy

A. To apply custom animations when transitioning between activities

B. To change the app's theme dynamically

C. To start a new activity without animation

D. To stop all running animations in the app

Solution

1. Step 1: Understand the role of overridePendingTransition

   This method is called right after starting a new activity to specify the enter and exit animations.

2. Step 2: Identify its effect on activity transitions

   It customizes how the new activity appears and how the old one disappears, improving user experience.

3. Final Answer:

   To apply custom animations when transitioning between activities -> Option A

4. Quick Check:

   overridePendingTransition = custom animations [OK]

Hint: Remember: overridePendingTransition controls activity switch animations [OK]

Common Mistakes:

• Thinking it changes app theme
• Assuming it disables animations
• Confusing it with stopping animations

2. Which of the following is the correct syntax to apply a transition animation after starting a new activity in Kotlin?

easy

A. startActivity(intent)
overridePendingTransition(R.anim.slide_in, R.anim.slide_out)

B. overridePendingTransition(R.anim.slide_in, R.anim.slide_out)
startActivity(intent)

C. startActivity(intent)
setTransition(R.anim.slide_in, R.anim.slide_out)

D. startActivity(intent)
overrideTransition(R.anim.slide_in, R.anim.slide_out)

Solution

1. Step 1: Recall the correct order of method calls

   You must call startActivity(intent) first, then overridePendingTransition immediately after.

2. Step 2: Verify method names and parameters

   The method is overridePendingTransition, taking two animation resource IDs for enter and exit animations.

3. Final Answer:

   startActivity(intent) overridePendingTransition(R.anim.slide_in, R.anim.slide_out) -> Option A

4. Quick Check:

   startActivity then overridePendingTransition [OK]

Hint: Call overridePendingTransition right after startActivity [OK]

Common Mistakes:

• Calling overridePendingTransition before startActivity
• Using wrong method names like setTransition
• Passing incorrect parameters

3. Given the following code snippet in an Android Kotlin app, what animation effect will the user see when transitioning to SecondActivity?

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

medium

A. No animation will occur because fade_in and fade_out are invalid

B. SecondActivity slides in from the right, current activity slides out to the left

C. SecondActivity zooms in while current activity zooms out

D. SecondActivity fades in while the current activity fades out

Solution

1. Step 1: Understand the animation resource names

   Animations named fade_in and fade_out typically cause views to gradually appear or disappear by changing opacity.

2. Step 2: Apply to activity transition

   The new activity will fade in, and the old activity will fade out, creating a smooth crossfade effect.

3. Final Answer:

   SecondActivity fades in while the current activity fades out -> Option D

4. Quick Check:

   fade_in + fade_out = crossfade effect [OK]

Hint: fade_in/out means smooth appearing/disappearing [OK]

Common Mistakes:

• Assuming slide or zoom animations without checking names
• Thinking no animation occurs if unsure about resource validity
• Confusing fade with zoom or slide

4. Identify the error in the following Kotlin code snippet that tries to apply a transition animation:

startActivity(Intent(this, NextActivity::class.java))
overridePendingTransition(R.anim.slide_in_left)

medium

A. Animation resource IDs must be strings, not integers

B. Incorrect method name; should be setPendingTransition

C. Missing second animation resource parameter in overridePendingTransition

D. startActivity should be called after overridePendingTransition

Solution

1. Step 1: Check the method signature of overridePendingTransition

   This method requires two parameters: one for the enter animation and one for the exit animation.

2. Step 2: Identify the missing parameter

   The code only provides one animation resource, causing a compile-time error.

3. Final Answer:

   Missing second animation resource parameter in overridePendingTransition -> Option C

4. Quick Check:

   overridePendingTransition needs two animations [OK]

Hint: overridePendingTransition always needs two animation IDs [OK]

Common Mistakes:

• Providing only one animation resource
• Using wrong method names
• Calling overridePendingTransition before startActivity

5. You want to create a smooth slide transition when moving from MainActivity to DetailActivity. You have two animation XML files: slide_in_right.xml and slide_out_left.xml in res/anim/. Which code snippet correctly applies these animations during the activity transition?

hard

A. overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left)
startActivity(Intent(this, DetailActivity::class.java))

B. startActivity(Intent(this, DetailActivity::class.java))
overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left)

C. startActivity(Intent(this, DetailActivity::class.java))
overridePendingTransition(R.anim.slide_out_left, R.anim.slide_in_right)

D. startActivity(Intent(this, DetailActivity::class.java))
overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right)

Solution

1. Step 1: Confirm the order of method calls

   You must call startActivity first, then overridePendingTransition immediately after.

2. Step 2: Match animations to correct enter and exit roles

   slide_in_right is the enter animation for the new activity, and slide_out_left is the exit animation for the current activity.

3. Final Answer:

   startActivity(Intent(this, DetailActivity::class.java)) overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left) -> Option B

4. Quick Check:

   startActivity then overridePendingTransition with correct animations [OK]

Hint: Enter animation first, exit animation second after startActivity [OK]

Common Mistakes:

• Swapping enter and exit animations
• Calling overridePendingTransition before startActivity
• Using wrong animation resource names