如何从 ViewModel 导航到 Fragment in Android Kotlin

Question

I have a view model I have added a click event listener. How do I navigate from that ViewModel into a Fragment

The ViewModel Code

class PromoAdapter(var promo: ArrayList<PromoModal>) :
    RecyclerView.Adapter<PromoAdapter.UserViewHolder>() {

    override fun onBindViewHolder(holder: UserViewHolder, position: Int) {
        holder.bind(promo[position])
        holder.promoRow.setOnClickListener() {
            // Navigate to Fragment with name UserFragment
           
        };
    }
}

User Fragment Code

class UserFragment : Fragment() {

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?,
    ): View? {
        val view: View = LayoutInflater.from(container!!.context)
            .inflate(R.layout.user_page_fragment, container, false)
   }
}

I have tried writing the following code still not working

Inside the ViewModel Click Event

val intent = Intent(itemView.context, UserFragment::class.java)
itemView.context?.startActivity(intent)

I cant find something working any help will be appreciated

Answer 1

It's better to move the click listener to a fragment

In Adapter:

class PromoAdapter(
    var promo: ArrayList<PromoModal>,
    val openFragment: (promoModal: PromoModal) -> Unit
  ) :
    RecyclerView.Adapter<PromoAdapter.UserViewHolder>() {

    override fun onBindViewHolder(holder: UserViewHolder, position: Int) {
        holder.bind(promo[position])

        val currentItem = promo.getOrNull(position) ?: return

        holder.promoRow.setOnClickListener {
            openFragment(currentItem)
           
        };
    }
}

In Fragment:

val mAdapter = PromoAdapter(
     promo = promoList,
     openFragment = { promoModal ->
          // Navigate to Fragment with name UserFragment 
     }
   )