Google Flutter Google Flutter Animations

Question 1

Which class in Flutter is the foundation for all animation objects and holds a value that changes over time?

Accepted Answer

Animation<double>

Answer

Animation<double> is the abstract base class that holds a value changing over time and notifies listeners of state changes.

Question 2

What is the primary purpose of an AnimationController in Flutter?

Accepted Answer

To control the playback, duration, and direction of an animation

Answer

AnimationController controls the animation's duration, playback direction (forward/reverse), and can start, stop, or repeat the animation.

Question 3

Which widget automatically rebuilds itself whenever an Animation's value changes?

Accepted Answer

AnimatedBuilder

Answer

AnimatedBuilder takes an Animation and a builder callback, rebuilding only the widget subtree inside builder whenever the animation ticks.

Question 4

What does a Tween<double>(begin: 0.0, end: 1.0).animate(controller) return?

Accepted Answer

An Animation<double>

Answer

Tween.animate() chains the tween to a parent animation and returns an Animation<double> whose value interpolates between begin and end.

Question 5

Which Curve constant produces an animation that overshoots the target and then settles back?

Accepted Answer

Curves.elasticOut

Answer

Curves.elasticOut creates a spring-like overshoot effect where the value exceeds the target before settling, simulating elastic snap.

Google Flutter Practice Test