Google Flutter Google Flutter Animations 2

Question 1

Which Flutter widget interpolates its properties (color, size, padding) automatically over a given duration when they change?

Accepted Answer

AnimatedContainer

Answer

AnimatedContainer automatically animates changes to its decoration, size, alignment, and padding over the specified duration without requiring a controller.

Question 2

What class would you extend to create a custom implicitly animated widget in Flutter?

Accepted Answer

ImplicitlyAnimatedWidget

Answer

Extending ImplicitlyAnimatedWidget gives you the built-in animation controller and tween machinery needed to animate between old and new property values.

Question 3

Which widget is the correct choice to animate a value to a new target without managing a controller yourself?

Accepted Answer

TweenAnimationBuilder

Answer

TweenAnimationBuilder drives an animation from a tween toward a target value and calls its builder on each frame, with no controller management required.

Question 4

When using AnimatedSwitcher, what determines how the old and new child widgets transition?

Accepted Answer

The transitionBuilder parameter

Answer

AnimatedSwitcher's transitionBuilder callback wraps each child with a transition widget (e.g., FadeTransition), controlling how old and new children animate in and out.

Question 5

How does Flutter's Hero animation work between two routes?

Accepted Answer

It shares a tagged widget and flies it between the source and destination screens

Answer

Hero matches widgets with the same tag across routes and animates the shared element from its position on the source page to its position on the destination page.

Google Flutter Practice Test

Google Flutter Practice Test

Google Flutter Google Flutter Animations 2