[참고]네비게이션바 리스너에 this 넣을시 에러

메엔 엑티비티에 네비게이션뷰를 상속받지 않고 바로 람다식으로 리스너를 달면 됩니다

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

//        bottom_navigation.setOnNavigationItemReselectedListener(this)

        bottom_navigation.setOnNavigationItemSelectedListener { it ->
            when (it.itemId) {
                R.id.action_home -> {
                    val detailViewFragment = DetailViewFragment()
                    supportFragmentManager.beginTransaction().replace(R.id.main_content, detailViewFragment).commit()
                    true
                }
                R.id.action_search -> {
                    val gridFragment = GridFragment()
                    supportFragmentManager.beginTransaction().replace(R.id.main_content, gridFragment).commit()
                    true
                }
                R.id.action_photo -> {
                    true
                }
                R.id.action_favorite_alarm -> {
                    val alarmFragment = AlarmFragment()
                    supportFragmentManager.beginTransaction().replace(R.id.main_content, alarmFragment).commit()
                    true
                }
                R.id.action_account -> {
                    val userFragment = UserFragment()
                    supportFragmentManager.beginTransaction().replace(R.id.main_content, userFragment).commit()
                    true
                }
                else -> false
            }
        }
    }
}