Room Persistence Library with Live Data and Kotlin Coroutines

Live session record on Youtube: https://www.youtube.com/watch?v=hXNmS8-t3Is
Github sample project: https://github.com/guenodz/room-livedata-coroutines

Transcript

1. Dr. Mohamed Guendouz Android GDE | Assistant Professor @guenodz Room Persistence Library with Live Data and Kotlin Coroutines
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5. What is Data Persistence ? • Data Persistence means saving/storing data for later use. • Data can be files (photos,audio/video), user settings, structured data (SQL tables). • Android provides different solutions for each case.
6. Data Persistence in Android 1. SharedPreferences: for storing basic data (user settings, game score). 2. Local Files: for saving raw data files (Audio/Video, Photos, Text files). 3. SQLite Databases: for saving structured data in SQL tables (posts, events).
7. SQLite for Android • Pros: ◦ Native support ◦ SQL ◦ ... • Cons: ◦ A lot of boilerplate code ◦ Hard TDD ◦ ... •
8. Room • Room definition: “The Room persistence library provides an abstraction layer over SQLite to allow fluent database access while harnessing the full power of SQLite.” • Room is an advanced ORM (Object Relational Mapping) library for Android, part of the Architecture Components.
9. Adding Room to your project In build.gradle (app level) def room_version = "2.2.5" implementation "androidx.room:room-runtime:$room_version" annotationProcessor "androidx.room:room-compiler:$room_version" //ViewModel & LiveData implementation "android.arch.lifecycle:extensions:1.1.1" annotationProcessor "android.arch.lifecycle:compiler:1.1.1"
10. Room Components 10
11. @Entity • An entity class represents a table, it maps its columns into class attributes. • One entity class for each table within the database.
12. @DAO (Data Access Object) • A DAO class contains CRUD operations for a particular table. • No implementation needed.
13. @Database • A database class represents the actual Room database. • Includes database entities. • Provides DAO implementations. • Main access point
14. Sample project https://github.com/guenodz/room-livedata-coroutines
15. Dr. Mohamed Guendouz Android GDE | Assistant Professor @guenodz Thank You!