Android Week 13

What is the approach Jetpack Compose uses for handling UI and gestures?

A declarative, modular, and coroutine-frinedly approach using modifiers

What is used instead of XML event listeners in Compose?

Gesture detectors and modifiers like pointerInput

What does Modifier.pointerInput do?

Defines custom gesture detectors inside a coroutine scope

What does Modifier.clickable detect?

Click (tap) gestures

What does modifier.draggable detect?

Drag gestures

What does Modifier.scrollable handle?

Scroller interactions

What is Modifier.swipeable used for?

Complex swipe gestures (e.g., bottom sheets, toggles

What key does pointerInput usually take?

Unit or a state key

Name gesture detection APIs used inside pointerInput

awaitPointerEventScope{}, detectTapGestures, detectDragGestures

What does detectTapGestures support?

onTap, onLongPress, and onDoubleTap

What API is used for detecting drag gestures?

detectDragGestures

How do you update drag position in Compose?

Use Offset, remember, and update offset.value inside detectDragGestures

which modifiers handle vertical and horizontal scrolls?

verticalScroll(rememberScrollState()) and horizontalScroll(rememberScrollState())

What is used for efficent scrolling lists in compose?

LazyColumn or LazyRow

What gesture detector handles pinch, zoom, rotate, and pan?

detectTransformGestures

What are transform gestures useful for?

Image zooming, maps, photo editors

What does swipeable require?

A state (rememberSwipeableState), anchors, thresholds, and orientation

Name UI features that use swipeable

Bottom sheets, swipe-to-dismiss, toggle switches

What functions help with nesting gestures?

awaitFirstDown, awaitTouchSlopOrCancellation, consumeAllChanges()

Which modifier helps with nested scroll behaviors?

nestedScroll() and NestedScrollConnection

How do you animate gestures in Compose?

Use Animatable, coroutine launch, and snapTo() inside gesture detectors