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.

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

content

text

label

color

None

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

To change the button size.

To add space around the button.

To adjust the text alignment.

To change the button color.

None

What does the scrollToItem function do?

Scrolls the list horizontally.

Instantly scrolls to a specified pixel position.

Instantly scrolls to a specified item index.

Animates the scrolling to the top of the list.

None

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

To delay UI updates.

To block the main thread.

To stop the scrolling animation.

To launch scroll actions asynchronously.

None

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

scrollOffset()

getScrollState()

getScrollPosition()

listState.firstVisibleItemIndex

None

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

scrollToItem()

animateScrollTo()

launchScroll()

launchAsync()

None

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

padding()

contentPadding

paddingBottom()

verticalPadding

None

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

LazyListScope

ScrollState

Row

AnimatedVisibility

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

10.

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

11.

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 group items by a common selector for sticky headers.

To filter out certain list items.

None

12.

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

To create a new list state.

To manage item clicks.

To optimize the rendering of images.

To calculate a state based on changes in another state.

None

13.

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

14.

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

15.

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