Android pre-populated database (update methods)

MyDatabaseHelper.kt

package com.example.example

// ...
import android.content.SharedPreferences

class ActsDbHelper(val context: Context) : SQLiteOpenHelper(context, DATABASE_NAME, null, DATABASE_VERSION) {

    private val preferences: SharedPreferences = context.getSharedPreferences(
            "${context.packageName}.database_versions",
            Context.MODE_PRIVATE
    )

    private fun installedDatabaseIsOutdated(): Boolean {
        return preferences.getInt(DATABASE_NAME, 0) < DATABASE_VERSION
    }

    private fun writeDatabaseVersionInPreferences() {
        preferences.edit().apply {
            putInt(DATABASE_NAME, DATABASE_VERSION)
            apply()
        }
    }

    private fun installDatabaseFromAssets() {
        // ...
    }

    override fun onCreate(db: SQLiteDatabase?) {
        // Nothing to do
    }

    override fun onUpgrade(db: SQLiteDatabase?, oldVersion: Int, newVersion: Int) {
        // Nothing to do
    }

    companion object {
        // ...
    }

}