Android Development Android Data Storage

Question 1

Which Android Jetpack library provides an abstraction layer over SQLite for local data persistence?

Accepted Answer

Room

Answer

Room is a persistence library that provides compile-time verification of SQL queries and abstracts SQLite database access.

Question 2

What annotation marks a class as a Room database entity?

Accepted Answer

@Entity

Answer

The @Entity annotation marks a Kotlin or Java class as a Room database table, with each field mapping to a column.

Question 3

Which Room annotation is used to define data access methods?

Accepted Answer

@Dao

Answer

@Dao marks an interface or abstract class as a Data Access Object, which contains methods for interacting with the database.

Question 4

What is the purpose of SharedPreferences in Android?

Accepted Answer

To store small amounts of primitive key-value data persistently

Answer

SharedPreferences provides a mechanism for storing and retrieving small amounts of primitive data as key-value pairs that persist across app sessions.

Question 5

Which Jetpack component is the recommended replacement for SharedPreferences?

Accepted Answer

DataStore

Answer

Jetpack DataStore is the recommended replacement for SharedPreferences, offering asynchronous, consistent, and transactional data storage.

Android Development Practice Test

Android Development Practice Test

Android Development Android Data Storage