AAD AAD Jetpack Libraries & Modern Android Development

Question 1

What is the primary purpose of ViewModel in Android Jetpack?

Accepted Answer

Store and manage UI-related data that survives configuration changes

Answer

ViewModel is designed to store and manage UI-related data in a lifecycle-conscious way so that data survives configuration changes like screen rotations.

Question 2

Which Jetpack component is used to schedule deferrable, guaranteed background work?

Accepted Answer

WorkManager

Answer

WorkManager is the Jetpack library for scheduling deferrable, constraint-aware background tasks that are guaranteed to run even if the app exits or the device restarts.

Question 3

What type does LiveData emit that makes it lifecycle-aware?

Accepted Answer

It only delivers updates to observers in an active lifecycle state

Answer

LiveData is lifecycle-aware and only notifies observers that are in an active lifecycle state (STARTED or RESUMED), preventing crashes and memory leaks.

Question 4

In Jetpack Navigation, what is a NavGraph?

Accepted Answer

An XML resource that defines destinations and actions for in-app navigation

Answer

A NavGraph is an XML resource file that centralizes all navigation destinations (Fragments, Activities) and the actions connecting them in one place.

Question 5

What annotation marks a method as a database query in a Room DAO?

Accepted Answer

@Query

Answer

@Query is the Room annotation used on DAO methods to define custom SQL SELECT (or other) statements to retrieve data from the database.

(AAD) Associate Android Developer Certification Practice Test

(AAD) Associate Android Developer Certification Practice Test

AAD AAD Jetpack Libraries & Modern Android Development