Jetpack Compose

Question 1

What is jetpack compose

Answer 1

A modern toolkit for building native UI on Android using declarative syntax

Question 2

What is a composable function

Answer 2

A function that describes UI and can be recomposed efficiently when data changes

Question 3

What is state in jetpack compose

Answer 3

Data that can change and trigger recomposition of UI

Question 4

What is remember in jetpack compose

Answer 4

A function to create state that persists across recompositions within a composable

Question 5

How do you handle navigation in jetpack compose

Answer 5

Using the navigation component to manage different screens and their transitions

Question 6

What is LazyColumn

Answer 6

A composable for efficiently displaying large lists of items vertically

Question 7

What is a modifier in jetpack compose

Answer 7

A way to change the appearance or behaviour of a composable

Question 8

What’s the difference between @Composable with @Preview

Answer 8

@Composable is used to define a composable function, while @Preview is used to display a preview of a composable in android studio layout editor

Question 9

What are state composables and stateless composables

Answer 9

State composables hold state and can be recomposed when the data changes
Stateless composables don’t hold state and are recomposed when their inputs change

Question 10

Explain how to handle user interactions with composables

Answer 10

Use modifiers like clickable, onLongClick or gesture detection APIs

Question 11

How do you create custom composables

Answer 11

Define functions annotated with @Composable that describe the UI and logic

Question 12

What are slot APIs in Jetpack Compose

Answer 12

Allow customization of composable layouts by providing content within them

Question 13

Explain how to achieve theming consistency across your app

Answer 13

Use MaterialTheme to provide a theme throughout the app hierarchy

Question 14

How do you handle accessibility in Jetpack Compose

Answer 14

Use semantic properties like contentDescription and follow accessibility best practices

Question 15

What are animation APIs in jetpack compose

Answer 15

Use AnimatedVisibility or transition to animate composable appearances or changes

Question 16

Explain how to perform data fetching and asynchronous operations in jetpack compose

Answer 16

Use LaunchedEffect or rememberCoroutineScope to launch coroutines within composables

Question 17

How do you handle state hoisting in jetpack compose

Answer 17

Lift state to a common ancestor composable to avoid unnecessary recompositions

Question 18

What is the difference between Surface and Box composables

Answer 18

Surface provides a material design background, while Box is a generic container for other composables

Question 19

Explain how to implement navigation drawers in jetpack compose

Answer 19

Use the NavigationDrawer composable and handle navigation actions

Question 20

How do you integrate bottom navigation with jetpack compose

Answer 20

Use the BottomNavigation composable and navigat to different destinations based on selections

Question 21

What are Modifier.fillMaxSize and Modifier.wrapContentSize used for

Answer 21

FillMaxSize makes a composable fill it’s parents size, while wrapContentSize sizes the composable based on its content

Question 22

Explain how to create custom modifiers in jetpack compose

Answer 22

Define functions that return new modifiers by combining existing ones or adding custom logic

Question 23

How do you test composables in jetpack compose

Answer 23

Use the composeUiTest library to write unit and integration tests for composables

Question 24

What are LazyColumnFor and LazyRowFor composables used for

Answer 24

Efficiently display large lists of items with access to their index

Question 25

Explain how to handle errors and loading states in jetpack compose

Answer 25

Use composables like Box and If to conditionally display loading or error states based on data availability

Question 26

How do you measure and optimize the performance of your jetpack compose UIs

Answer 26

Use tools like Android Studio Profiler and identify bottlenecks in recomposition

Question 27

What are the benefits of using previews in jetpack compose

Answer 27

Allow for quick visual inspection of composable UIs during development

Question 28

Explain the concept of concurrency and lifecycle awareness in jetpack compose

Answer 28

Use coroutines and LaunchedEffect to manage background tasks and ensure composables handle lifecycle events appropriately