![This work is licensed under the Apache 2.0 License
@Dao
interface VideoDao {
@Query("select * from databasevideo")
fun getVideos(): LiveData<List<DatabaseVideo>>
@Insert(onConflict = OnConflictStrategy.REPLACE)
fun insertAll( videos: List<DatabaseVideo>)
}
@Database(entities = [DatabaseVideo::class], version = 1)
abstract class VideosDatabase: RoomDatabase() {
abstract val videoDao: VideoDao
}
private lateinit var INSTANCE: VideosDatabase
fun getDatabase(context: Context): VideosDatabase {
synchronized(VideosDatabase::class.java) {
if (!::INSTANCE.isInitialized) {
INSTANCE = Room.databaseBuilder(context.applicationContext,
VideosDatabase::class.java,
"videos").build()
}
}
return INSTANCE
}
Room.kt](https://image.slidesharecdn.com/session4slides-211012021152/85/Android-Study-Jam-2021-Session-4-slides-13-320.jpg)
Android Study Jam 2021 Session 4 slides
- 1. This work is licensed under the Apache 2.0 License Android Study Jams Prior Programming Experience Track: Session 4
- 2. This work is licensed under the Apache 2.0 License Prior Programming Experience Track: Session 4 Android Study Jams
- 3. This work is licensed under the Apache 2.0 License Learning Objectives ० Learn about Repository Layer to manage Data ० Using WorkManager for scheduled tasks ० Design your app using Material Design ० Test your app
- 4. This work is licensed under the Apache 2.0 License A little about me
- 5. This work is licensed under the Apache 2.0 License Concept Overview What is the Repository Layer?
- 6. This work is licensed under the Apache 2.0 License Repository Modules handle data operations.
- 7. This work is licensed under the Apache 2.0 License Repository Components ● Model (Database) ● Remote Data (Network) ● Provides API for accessing both
- 8. This work is licensed under the Apache 2.0 License Why Repository ● Separation of Concerns ● Activity/Fragment are glue ● UI driven by data ● Testable and Consistent
- 9. This work is licensed under the Apache 2.0 License Repository cont... ● DI vs Service Lookup ● View Models and Streams ● ORMs
- 10. This work is licensed under the Apache 2.0 License Databases ● Caches ● Room Library - ORM ● Database Refresh Strategy ● Observables
- 11. This work is licensed under the Apache 2.0 License Room ● @Entity @ColumnInfo ● @Dao ● @Insert, @Delete, and @Update ● @Query
- 12. This work is licensed under the Apache 2.0 License Don’t forget to test!
- 13. This work is licensed under the Apache 2.0 License @Dao interface VideoDao { @Query("select * from databasevideo") fun getVideos(): LiveData<List<DatabaseVideo>> @Insert(onConflict = OnConflictStrategy.REPLACE) fun insertAll( videos: List<DatabaseVideo>) } @Database(entities = [DatabaseVideo::class], version = 1) abstract class VideosDatabase: RoomDatabase() { abstract val videoDao: VideoDao } private lateinit var INSTANCE: VideosDatabase fun getDatabase(context: Context): VideosDatabase { synchronized(VideosDatabase::class.java) { if (!::INSTANCE.isInitialized) { INSTANCE = Room.databaseBuilder(context.applicationContext, VideosDatabase::class.java, "videos").build() } } return INSTANCE } Room.kt
- 14. This work is licensed under the Apache 2.0 License @Entity data class DatabaseVideo constructor( @PrimaryKey val url: String, val updated: String, val title: String, val description: String, val thumbnail: String) /** * Map DatabaseVideos to domain entities */ fun List<DatabaseVideo>.asDomainModel(): List<DevByteVideo> { return map { DevByteVideo( url = it.url, title = it.title, description = it.description, updated = it.updated, thumbnail = it.thumbnail) } } DatabaseEntities.kt
- 15. This work is licensed under the Apache 2.0 License Network ● REST Services ● Retrofit Library - for API Calls ● Moshi - for JSON to Model ● Observables
- 16. This work is licensed under the Apache 2.0 License interface DevbyteService { @GET("devbytes") suspend fun getPlaylist(): NetworkVideoContainer } object DevByteNetwork { // Configure retrofit to parse JSON and use coroutines private val retrofit = Retrofit.Builder() .baseUrl("https://android-kotlin-fun-mars-server.appspot.com/") .addConverterFactory(MoshiConverterFactory.create()) .build() val devbytes = retrofit.create(DevbyteService::class.java) } Service.kt
- 17. This work is licensed under the Apache 2.0 License @JsonClass(generateAdapter = true) data class NetworkVideoContainer(val videos: List<NetworkVideo>) @JsonClass(generateAdapter = true) data class NetworkVideo( val title: String, val description: String, val url: String, val updated: String, val thumbnail: String, val closedCaptions: String?) fun NetworkVideoContainer.asDomainModel(): List<DevByteVideo> {} fun NetworkVideoContainer.asDatabaseModel(): List<DatabaseVideo> {} DTO.kt
- 18. This work is licensed under the Apache 2.0 License Work Manager
- 19. This work is licensed under the Apache 2.0 License Work Manager ● For scheduling repeating tasks ● Define constraints ● Retry ● Chaining ● Threading
- 20. This work is licensed under the Apache 2.0 License Material Design
- 21. This work is licensed under the Apache 2.0 License Testing
- 22. This work is licensed under the Apache 2.0 License Testing
- 23. This work is licensed under the Apache 2.0 License Demos
- 24. This work is licensed under the Apache 2.0 License Learn More
- 25. This work is licensed under the Apache 2.0 License Want to learn more? ● Official Android Developers Site: https://developer.android.com/ ● Android Samples on GitHub ● Official Android Developers Blog (for announcements) ● Android Developers Medium Blog (for more technical articles) ● Android Developers YouTube channel ● Follow @AndroidDev on Twitter ● Subscribe to the Android Developer Newsletter ● Kotlin Vocabulary series ● Official Kotlin language site Version 1.0