How to update fragmentStateAdapter after a bottomSheet dismiss

Question

I have this fragmentStateAdapter which holds some of my Cards in order to swipe among them:

public class ScreenSlidePagerAdapter(activity: AppCompatActivity, var items: ArrayList<Helpers.Card>, private val saveToDb: Boolean) : FragmentStateAdapter(activity) {
override fun getItemCount(): Int = items.count()
var fragment:CardItemFragment?=null
override fun createFragment(position: Int): Fragment{
    fragment =CardItemFragment(position, saveToDb ,this) //.newInstance( items[position ].getSaveString())
    return fragment as CardItemFragment
}}

and the CardItemFragement is:

class CardItemFragment(val position:Int, val saveToDb: Boolean, val isCardMine: Boolean,val adapter: ScreenSlidePagerAdapter) : Fragment() {
    lateinit var cardView1: ConstraintLayout
    lateinit var crdNameTB1: TextView
    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    val v = inflater.inflate(R.layout.card_item, container, false)
    cardView1 = v.findViewById(R.id.cardView1)
    crdNameTB1= v.findViewById(R.id.crdNameTB1)
    return v
  }

Then I can update the Card inside the fragementStateAdapter like this:

 fun updateCard(): Bitmap? {
     crdNameTB1.text = .....
}

That's works fine and I can swipe among my Cards, but when I change the value of "name" attribute of my Card via a bottom sheet and when I dismiss the BottomSheet I use this code to refresh the fragmentSatateAdapter:

 MainActivity.galleryPagerAdapter?.fragment ?.updateCard()

I set MyActivity as companion object to reach it anywher.

When this code executed, I got the fragment not null object but the updateCard gives me null objects 1what is the problem and how can I overcome this and update the shown Card?

Answer 1

I have found the answer by overriding the following methods in order to make the Adapter run

override fun getItemId(position: Int): Long {return items[position].id}


override fun containsItem(itemId: Long): Boolean = items.any { it.id == itemId }

the answer post is here