Compose Sticky Headers Quiz

In this quiz, you will test your understanding of implementing lazy lists with sticky headers and scroll detection in Jetpack Compose. The questions focus on concepts such as using LazyColumn and LazyRow for efficient list rendering, grouping data with the groupBy() method, implementing sticky headers for grouped data, and detecting scroll positions to trigger UI actions. This quiz also covers the usage of important Compose functions and modifiers like scrollToItem(), AnimatedVisibility, rememberLazyListState, and more.

What does the PaddingValues parameter do in a LazyColumn?

Aligns list items to the center.

Sets margins for the entire list.

Adds padding to the content of the list.

Adjusts the spacing between list items.

None

What happens when the AnimatedVisibility composable is used?

It animates the showing and hiding of a component.

It changes the background color of a component.

It scrolls the list automatically.

It hides a component permanently.

None

What does the stickyHeader function do in a LazyColumn?

Displays a header that stays visible while its group scrolls.

Adds a shadow effect to list items.

Prevents items from being recycled.

Optimizes the performance of scrolling.

None

What modifier is used to add bottom padding to the LazyColumn?

contentPadding

padding()

paddingBottom()

verticalPadding

None

What does the scrollToItem function do?

Instantly scrolls to a specified item index.

Scrolls the list horizontally.

Animates the scrolling to the top of the list.

Instantly scrolls to a specified pixel position.

None

Which parameter is used to specify the text displayed in a sticky header?

content

color

text

label

None

Why is the padding() modifier used for the scroll-to-top button?

To change the button color.

To add space around the button.

To adjust the text alignment.

To change the button size.

None

What is the primary purpose of using the groupBy() function in the LazyColumn?

To divide the list into smaller arrays.

To sort the items alphabetically.

To filter out certain list items.

To group items by a common selector for sticky headers.

None

Which function is used to launch the scroll-to-top action in a coroutine?

scrollToItem()

animateScrollTo()

launchScroll()

launchAsync()

None

10.

Why is the ExperimentalFoundationApi annotation used when adding sticky headers?

To handle errors during scrolling.

To enable backward compatibility.

To improve performance.

To access experimental APIs in Compose.

None

11.

How is the coroutineScope used when handling scroll actions in this tutorial?

To launch scroll actions asynchronously.

To delay UI updates.

To stop the scrolling animation.

To block the main thread.

None

12.

Which function is used to detect the scroll position of a LazyColumn?

getScrollState()

listState.firstVisibleItemIndex

getScrollPosition()

scrollOffset()

None

13.

What is the purpose of the derivedStateOf function in this context?

To create a new list state.

To calculate a state based on changes in another state.

To optimize the rendering of images.

To manage item clicks.

None

14.

Which element is responsible for adjusting the visibility of the scroll button?

ScrollState

AnimatedVisibility

Row

LazyListScope

None

15.

What is the function of the fillMaxWidth() modifier in the sticky header?

To make the header scroll horizontally.

To restrict the width of the header.

To make the header occupy the full width of the screen.

To adjust the text alignment within the header.

None