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 stickyHeader function do in a LazyColumn?

Optimizes the performance of scrolling.

Prevents items from being recycled.

Displays a header that stays visible while its group scrolls.

Adds a shadow effect to list items.

None

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

getScrollPosition()

scrollOffset()

getScrollState()

listState.firstVisibleItemIndex

None

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

To delay UI updates.

To launch scroll actions asynchronously.

To block the main thread.

To stop the scrolling animation.

None

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 manage item clicks.

To optimize the rendering of images.

None

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

content

text

color

label

None

What happens when the AnimatedVisibility composable is used?

It scrolls the list automatically.

It hides a component permanently.

It animates the showing and hiding of a component.

It changes the background color of a component.

None

Why is the ExperimentalFoundationApi annotation used when adding sticky headers?

To improve performance.

To enable backward compatibility.

To access experimental APIs in Compose.

To handle errors during scrolling.

None

What does the scrollToItem function do?

Instantly scrolls to a specified pixel position.

Animates the scrolling to the top of the list.

Instantly scrolls to a specified item index.

Scrolls the list horizontally.

None

What does the PaddingValues parameter do in a LazyColumn?

Adds padding to the content of the list.

Sets margins for the entire list.

Aligns list items to the center.

Adjusts the spacing between list items.

None

10.

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

To make the header scroll horizontally.

To adjust the text alignment within the header.

To restrict the width of the header.

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

None

11.

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

verticalPadding

contentPadding

paddingBottom()

padding()

None

12.

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

animateScrollTo()

launchScroll()

launchAsync()

scrollToItem()

None

13.

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

Row

AnimatedVisibility

LazyListScope

ScrollState

None

14.

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

To change the button color.

To change the button size.

To add space around the button.

To adjust the text alignment.

None

15.

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

To filter out certain list items.

To divide the list into smaller arrays.

To sort the items alphabetically.

To group items by a common selector for sticky headers.

None