I want my Notification Badge to only read/count the new inputs and not everything. For Kotlin

Steps: If there are 4 RecyclerView layouts in the notification fragment, the Notification Badge will read a count of 4. When I click the Notification navigation btn, the count clears. If I input a new recyclerView the counter reads 5, instead of resetting to 1.

I want the notification badge to only count the new Notifications that come in.

Also once the app closes and reopens the notification badge, re-counts the old Notifications and the new ones together.

Once the app loads
Clicking notification Btn

package supgro.com.Controller.Service

class MainActivity (): AppCompatActivity() {

private lateinit var firebaseUser: FirebaseUser
var post: MutableList<Post>? = null
var noti: MutableList<Notification>? = null




/* This selectedFragment was used to test when the buttons were clicked they would go to that fragment/activity
 selectedFragment = HomeFragment()
 internal var selectedFragment: Fragment? = null*/

private val count: Int = 1

private val onNavigationItemSelectedListener = BottomNavigationView.OnNavigationItemSelectedListener { item ->
        when (item.itemId) {
            R.id.nav_home -> {
                //passing in moveToFragment function

                moveToFragment(HomeFragment())
                return@OnNavigationItemSelectedListener true

            }
            R.id.nav_search -> {
                moveToFragment(SearchFragment())
                return@OnNavigationItemSelectedListener true



            }
            R.id.nav_add -> {
                moveToFragment(PostSelectionFragment())
                //item.isChecked = false
            //startActivity(Intent(this@MainActivity, AddPostActivity::class.java))
                return@OnNavigationItemSelectedListener true

            }
            R.id.nav_notifications -> {
                if (moveToFragment( NotificationsFragment()) != null){
                    badgeClear(R.id.nav_notifications).apply {
                        isDestroyed

                      //  new_notifications_icon.visibility = View.VISIBLE
                    }

                }
                return@OnNavigationItemSelectedListener true


            }
            R.id.nav_profile -> {

                 moveToFragment(ProfileFragment())
                return@OnNavigationItemSelectedListener true

              /*  if (item.isEnabled){
                    item.isVisible = false
                }*/


            }
        }
   /* if (selectedFragment != null){
        supportFragmentManager.beginTransaction().replace(R.id.fragment_container, selectedFragment!!).commit()
    }*/

false

}

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

    firebaseUser = FirebaseAuth.getInstance().currentUser!!


    //bottom_nav_view is the name of the bottom navigation bar

val navView: BottomNavigationView = findViewById(R.id.bottom_nav_view)

navView.setOnNavigationItemSelectedListener (onNavigationItemSelectedListener)

    //this selects the first fragment activity to be loaded

    navView.getOrCreateBadge(R.id.nav_notifications).apply{
        val notiRef = FirebaseDatabase.getInstance().reference.child("Notifications")





        notiRef.addValueEventListener(object: ValueEventListener {
            override fun onDataChange(p0: DataSnapshot) {
                if (p0.exists()) {
                  number = p0.childrenCount.toInt()
                    isVisible = true
                   // noti!!.clear()


                }/*else if (p0.childrenCount <= 5){

                    number = p0.childrenCount.toInt()
                }*/




                }



            override fun onCancelled(p0: DatabaseError) {
                TODO("Not yet implemented")
            }

        })


    }

   // navView.removeBadge(R.id.nav_notifications)

    moveToFragment(HomeFragment())



}

private fun moveToFragment(fragment: Fragment){

val fragmentTrans = supportFragmentManager.beginTransaction()
fragmentTrans.replace(R.id.fragment_container, fragment)
fragmentTrans.commit()

}

private fun badgeClear(id: Int){
    val navView: BottomNavigationView = findViewById(R.id.bottom_nav_view)

    val badgeDrawable = navView.getOrCreateBadge(id)
    if (badgeDrawable != null){
        badgeDrawable.isVisible = false
        badgeDrawable.clearNumber()
    }
}

}