Kotlin Kotlin Android Development 3

Question 1

What is `WorkManager` used for in Android?

Accepted Answer

Scheduling deferrable background work that should survive app restarts

Answer

`WorkManager` is the recommended API for deferrable, guaranteed background work that persists across app restarts and system reboots.

Question 2

What does the `@Dao` annotation mark in Room?

Accepted Answer

A Data Access Object interface that defines database queries

Answer

`@Dao` marks an interface or abstract class containing Room database operations defined with annotations like `@Query`, `@Insert`, and `@Delete`.

Question 3

What annotation marks a class as a Room database entity?

Accepted Answer

@Entity

Answer

`@Entity` marks a Kotlin class as a Room database table, with each property representing a column.

Question 4

What is DataStore in Android Jetpack?

Accepted Answer

A data storage solution that replaces SharedPreferences using Flow

Answer

Jetpack DataStore is a modern alternative to SharedPreferences that stores key-value or typed data asynchronously using Kotlin Flow.

Question 5

What does `rememberCoroutineScope` provide in Jetpack Compose?

Accepted Answer

A CoroutineScope tied to the composition that allows launching coroutines from non-suspend UI event handlers

Answer

`rememberCoroutineScope` returns a `CoroutineScope` bound to the composition point, enabling coroutine launches in response to UI events outside `LaunchedEffect`.

Kotlin Practice Test

Kotlin Practice Test

Kotlin Kotlin Android Development 3