Surface and shape in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a rounded corner shape with 16.dp radius.

Android Kotlin

val shape = RoundedCornerShape([1])

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

A24.dp

B8.dp

C16.dp

D32.dp

Attempts:

3 left

💡 Hint

Common Mistakes

Using a plain number without dp causes errors.

Using too small or too large values changes the shape unexpectedly.

The RoundedCornerShape constructor takes a corner radius. Using 16.dp creates a shape with 16 density-independent pixels rounded corners.

2fill in blank

medium

Complete the code to set a background color and shape to a Box composable.

Android Kotlin

Box(modifier = Modifier.background(color = Color.Blue, shape = [1]))

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

ACutCornerShape(4.dp)

BRectangleShape

CRoundedCornerShape(8.dp)

DCircleShape

Attempts:

3 left

💡 Hint

Common Mistakes

Using RectangleShape will not round the corners.

Using RoundedCornerShape requires specifying the radius.

CircleShape creates a circular shape for the background of the Box.

3fill in blank

hard

Fix the error in the code to clip a composable with a rounded shape.

Android Kotlin

Modifier.[1](RoundedCornerShape(12.dp))

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

Aborder

Bclip

Cpadding

Dbackground

Attempts:

3 left

💡 Hint

Common Mistakes

Using background only sets color but does not clip.

Using padding or border does not clip the shape.

The clip modifier is used to apply a shape mask to a composable, clipping its content to that shape.

4fill in blank

hard

Fill both blanks to create a Box with a red background and a cut corner shape of 10.dp.

Android Kotlin

Box(modifier = Modifier.background(color = [1], shape = [2]))

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

AColor.Red

BColor.Green

CCutCornerShape(10.dp)

DRoundedCornerShape(10.dp)

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing rounded and cut corner shapes.

Using wrong color constants.

Using Color.Red sets the background color to red, and CutCornerShape(10.dp) creates a shape with cut corners of 10.dp size.

5fill in blank

hard

Fill all three blanks to create a Surface with a blue color, rounded corners of 20.dp, and elevation of 8.dp.

Android Kotlin

Surface(color = [1], shape = [2], elevation = [3]) {
    // content here
}

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

AColor.Blue

BRoundedCornerShape(20.dp)

C8.dp

DCutCornerShape(20.dp)

Attempts:

3 left

💡 Hint

Common Mistakes

Using cut corner shape instead of rounded.

Forgetting to add elevation or using wrong units.

The Surface composable uses Color.Blue for background color, RoundedCornerShape(20.dp) for smooth corners, and 8.dp for elevation to cast a shadow.