AnimatedBuilder in Flutter - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an AnimatedBuilder that listens to the animation.

Flutter

AnimatedBuilder(
  animation: [1],
  builder: (context, child) {
    return Container();
  },
)

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

AanimationController

Bcontext

Cchild

DsetState

Attempts:

3 left

💡 Hint

Common Mistakes

Using context or child instead of the animation object.

Leaving the animation property empty.

The animation property must be set to the animation object, usually an AnimationController.

2fill in blank

medium

Complete the builder function to return a Transform widget that rotates based on the animation value.

Flutter

AnimatedBuilder(
  animation: animationController,
  builder: (context, child) {
    return Transform.rotate(
      angle: [1],
      child: child,
    );
  },
  child: Icon(Icons.refresh),
)

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

AanimationController.value

BanimationController

Cchild

Dcontext

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the whole animationController instead of its value.

Using context or child as the angle.

The angle property needs a double value from the animation, which is accessed by animationController.value.

3fill in blank

hard

Fix the error in the AnimatedBuilder code by completing the missing property to optimize rebuilds.

Flutter

AnimatedBuilder(
  animation: animationController,
  builder: (context, [1]) {
    return Transform.scale(
      scale: animationController.value,
      child: [2],
    );
  },
  child: Container(color: Colors.blue, width: 100, height: 100),
)

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

Achild

Banimation

Ccontext

DsetState

Attempts:

3 left

💡 Hint

Common Mistakes

Using context instead of child as the second parameter.

Not using the child parameter inside the builder.

The builder function receives context and child. Using the child parameter avoids rebuilding the child widget unnecessarily.

4fill in blank

hard

Fill both blanks to create an AnimatedBuilder that changes opacity based on the animation value.

Flutter

AnimatedBuilder(
  animation: [1],
  builder: (context, child) {
    return Opacity(
      opacity: [2],
      child: child,
    );
  },
  child: Text('Fade'),
)

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

AanimationController

BanimationController.value

Ccontext

Dchild

Attempts:

3 left

💡 Hint

Common Mistakes

Using context or child as animation or opacity values.

Not using the animation controller's value for opacity.

The animation property should be the animation controller, and the opacity uses the controller's current value.

5fill in blank

hard

Fill all three blanks to build an AnimatedBuilder that moves a widget horizontally using a translation transform.

Flutter

AnimatedBuilder(
  animation: [1],
  builder: (context, child) {
    return Transform.translate(
      offset: Offset([2], 0),
      child: [3],
    );
  },
  child: Icon(Icons.directions_run),
)

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

AanimationController

BanimationController.value * 100

Cchild

Dcontext

Attempts:

3 left

💡 Hint

Common Mistakes

Using context instead of child inside the builder.

Not multiplying the animation value for visible movement.

Passing the wrong object as animation.

The animation property is the controller, the horizontal offset is the controller's value multiplied by 100 for visible movement, and the child widget is passed to avoid rebuilding.