آموزش باز کردن فایل دیتابیس آماده از پوشه Assets در اندروید با Kotlin

class Database(private val context: Context) {

    companion object {
        const val DATABASE_NAME = "master_db.sqlite"
    }


    fun openDatabase(): SQLiteDatabase {
        val dbFile = context.getDatabasePath(DATABASE_NAME)

        if (!dbFile.exists()) {
            try {
                val checkDatabase = context
                    .openOrCreateDatabase(DATABASE_NAME, Context.MODE_PRIVATE, null)

                checkDatabase?.close()
                copyDatabase()
            } catch (e: IOException) {
                throw RuntimeException("Error creating source database", e)
            }
        }

        return SQLiteDatabase
            .openDatabase(
                dbFile.path,
                null,
                SQLiteDatabase.OPEN_READWRITE
            )
    }

    private fun copyDatabase() {
        context.assets
            .open(DATABASE_NAME)
            .copyTo(
                out = FileOutputStream(context.getDatabasePath(DATABASE_NAME)),
                bufferSize = 8 * 1024
            )
    }
}

val db = Database(context).openDatabase()