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README.md
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SAMPLES.md
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README.md

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Define data using Room entities

The following code snippet is used to serialize a TV Series object fetched using The Movie DB API found here: https://www.themoviedb.org/documentation/api

The SerializeName is used to link the variables with the proper field whenever we use a different variable name for the object.

@Entity(tableName = "popular") data class Popular( @PrimaryKey var id: Int? = null, @SerializedName("original_name") @Expose var originalName: String? = null, @SerializedName("name") @Expose var name: String? = null, @SerializedName("popularity") @Expose var popularity: Double? = null, @SerializedName("vote_count") @Expose var voteCount: Int? = null, @SerializedName("vote_average") @Expose var voteAverage: Double? = null, @SerializedName("first_air_date") @Expose var firstAirDate: String? = null, @SerializedName("poster_path") @Expose var posterPath: String? = null, @SerializedName("genre_ids") @Expose var genreIds: List<Int>? = null, @SerializedName("original_language") @Expose var originalLanguage: String? = null, @SerializedName("backdrop_path") @Expose var backdropPath: String? = null, @SerializedName("overview") @Expose var overview: String? = null, @SerializedName("origin_country") @Expose var originCountry: List<String>? = null )

Access Room database with data access object (DAO)

The code-snippet below is an example of how we can use the Room Library to create a simple Interface that will be implemented by the Room library to create routes to add, fetch, update and delete data from the SQLite Database.

@Dao interface SeriesDao { @Query("SELECT * FROM popular") fun getAllPopular() : List<Popular> @Query("SELECT * FROM top") fun getAllTop() : List<Top> @Insert fun insertPopular(vararg series: Popular) //If we try to insert the same data, the table will be replaced @Insert(onConflict = OnConflictStrategy.REPLACE) fun insertTop(vararg series : Top) @Delete fun delete(vararg series: Top) }

Create the Singleton Database Object (Room)

@Database(entities = arrayOf(Popular::class, Top::class), version = 1) abstract class SeriesDatabase : RoomDatabase() { abstract fun SeriesDao(): SeriesDao @Synchronized companion object { private var INSTANCE : SeriesDatabase? = null fun getInstance(context: Context) : SeriesDatabase?{ if(INSTANCE == null) { INSTANCE = Room.databaseBuilder( context, SeriesDatabase::class.java, "SeriesDb") .build() return INSTANCE } else { return INSTANCE } } } }
  • Observe and respond to changing data using LiveData
  • Use a Repository to handle data operations
  • Read and parse raw resources or asset files
  • Create persistent preference data from user input
  • Change the behavior of the app based on user preferences