How to populate Android Room database table on first run?

Question

In SQLiteOpenHelper there is a onCreate(SQLiteDatabase ...) method which i used to populate database tables with some initial data.

Answer 1

I was struggling with this topic too and this solution worked for me:

// build.gradle

    def room_version = "2.2.5"

    // Room
    implementation "androidx.room:room-runtime:$room_version"
    kapt "androidx.room:room-compiler:$room_version"
    implementation "androidx.room:room-ktx:$room_version"

In your App class:

// virtually create the db
        val db = Room.databaseBuilder(
            appContext, AppDatabase::class.java,
            Res.getString(R.string.dbname)
        ).createFromAsset(Res.getString(R.string.source_db_name)).build()

        // first call to db really creates the db on filesystem
        db.query("SELECT * FROM " + Room.MASTER_TABLE_NAME, null)