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

Inflate XML layouts

Answer

Handle network requests directly

Answer

Replace the Activity class

Question 2

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

Accepted Answer

WorkManager

Answer

LiveData

Answer

Room

Answer

Navigation

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

It uses callbacks registered manually

Answer

It always delivers updates regardless of lifecycle

Answer

It emits data only once on subscription

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 graph database for storing navigation history

Answer

A Kotlin class that manages the back stack manually

Answer

A UI component that renders breadcrumbs

Question 5

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

Accepted Answer

@Query

Answer

@Select

Answer

@Find

Answer

@Fetch

Question 6

Which class in Jetpack's Data Binding library is automatically generated for each layout file?

Accepted Answer

A Binding class named after the layout file in PascalCase + 'Binding'

Answer

BindingAdapter

Answer

ViewHolder

Answer

DataBinder