これがエラーになるのは何でですか？(´･ω･`)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val db = ((MainActivity::_helper as DatabaseHelper).writableDatabase)
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val db = ((MainActivity::_helper as DatabaseHelper).writableDatabase)
}
