Android Data Storage Flashcards
6 cards from real Android Development practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 Android Data Storage flashcards as text
Which Android Jetpack library provides an abstraction layer over SQLite for local data persistence?
Answer: Room
Room is a persistence library that provides compile-time verification of SQL queries and abstracts SQLite database access.
What annotation marks a class as a Room database entity?
Answer: @Entity
The @Entity annotation marks a Kotlin or Java class as a Room database table, with each field mapping to a column.
Which Room annotation is used to define data access methods?
Answer: @Dao
@Dao marks an interface or abstract class as a Data Access Object, which contains methods for interacting with the database.
What is the purpose of SharedPreferences in Android?
Answer: To store small amounts of primitive key-value data persistently
SharedPreferences provides a mechanism for storing and retrieving small amounts of primitive data as key-value pairs that persist across app sessions.
Which Jetpack component is the recommended replacement for SharedPreferences?
Answer: DataStore
Jetpack DataStore is the recommended replacement for SharedPreferences, offering asynchronous, consistent, and transactional data storage.
What does WAL mode stand for in SQLite?
Answer: Write-Ahead Logging
WAL (Write-Ahead Logging) mode in SQLite allows concurrent reads and writes, improving performance in multi-threaded apps.