Android Development Android Background Processing 2

Question 1

What is the purpose of CoroutineScope in Kotlin?

Accepted Answer

To define the lifecycle and context in which coroutines run

Answer

CoroutineScope defines a scope for launching coroutines, ensuring they are cancelled when the scope is cancelled (e.g., when a ViewModel is cleared).

Question 2

Which WorkManager class is used to chain multiple work tasks sequentially?

Accepted Answer

WorkContinuation

Answer

WorkContinuation allows you to create chains of WorkRequests that execute sequentially or in parallel using then() and combine() methods.

Question 3

What does the suspend keyword do to a Kotlin function?

Accepted Answer

Marks it as a suspending function that can be paused and resumed

Answer

The suspend keyword marks a function as a coroutine that can suspend its execution without blocking the calling thread.

Question 4

Which Android component replaced IntentService for background processing?

Accepted Answer

Both A and B

Answer

Both WorkManager and JobIntentService replaced IntentService, with WorkManager being preferred for most deferrable background work.

Question 5

What is the viewModelScope in Android?

Accepted Answer

A CoroutineScope tied to the ViewModel's lifecycle that cancels when the ViewModel is cleared

Answer

viewModelScope is an extension property on ViewModel that provides a CoroutineScope automatically cancelled when the ViewModel is destroyed.

Android Development Practice Test