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.

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

To stop the scrolling animation.

To block the main thread.

To delay UI updates.

To launch scroll actions asynchronously.

None

What does the stickyHeader function do in a LazyColumn?

Adds a shadow effect to list items.

Optimizes the performance of scrolling.

Prevents items from being recycled.

Displays a header that stays visible while its group scrolls.

None

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

To group items by a common selector for sticky headers.

To divide the list into smaller arrays.

To sort the items alphabetically.

To filter out certain list items.

None

Why is the ExperimentalFoundationApi annotation used when adding sticky headers?

To access experimental APIs in Compose.

To handle errors during scrolling.

To enable backward compatibility.

To improve performance.

None

What does the scrollToItem function do?

Scrolls the list horizontally.

Instantly scrolls to a specified item index.

Instantly scrolls to a specified pixel position.

Animates the scrolling to the top of the list.

None

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

padding()

paddingBottom()

verticalPadding

contentPadding

None

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

To adjust the text alignment within the header.

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

To make the header scroll horizontally.

To restrict the width of the header.

None

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

To adjust the text alignment.

To add space around the button.

To change the button color.

To change the button size.

None

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

ScrollState

Row

AnimatedVisibility

LazyListScope

None

10.

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

color

content

text

label

None

11.

What happens when the AnimatedVisibility composable is used?

It animates the showing and hiding of a component.

It hides a component permanently.

It changes the background color of a component.

It scrolls the list automatically.

None

12.

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

To calculate a state based on changes in another state.

To create a new list state.

To manage item clicks.

To optimize the rendering of images.

None

13.

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

scrollToItem()

animateScrollTo()

launchAsync()

launchScroll()

None

14.

What does the PaddingValues parameter do in a LazyColumn?

Adjusts the spacing between list items.

Adds padding to the content of the list.

Sets margins for the entire list.

Aligns list items to the center.

None

15.

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

getScrollPosition()

listState.firstVisibleItemIndex

scrollOffset()

getScrollState()

None