Kotlin - Unable to update RecyclerView from fragment-CodePudding

I have a fragment (FragmentAdd) with a button which is supposed to update the RecyclerView of another fragment (FragmentHome). Why isn't the RecyclerView updated?

FragmentAdd:

saveBtn?.setOnClickListener{
    arrayList = getUpdatedList()
    val homeAdapter = HomeAdapter(FragmentHome(),arrayList)
    homeAdapter.updateRecyclerView(arrayList)
}

FragmentHome:

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
    val view = inflater.inflate(R.layout.fragment_home, container, false)
    recyclerView = view.findViewById(R.id.recyclerView)
    recyclerView!!.setHasFixedSize(true)
    recyclerView!!.layoutManager = LinearLayoutManager(context)
    recyclerView!!.adapter = HomeAdapter(this, transactList)

    return view
}

HomeAdapter:

fun updateRecyclerView(newList: ArrayList<Any>){
    itemsList.clear()
    itemsList.addAll(newList)
    this.notifyDataSetChanged()
}

I think the issue might be because I'm creating another object of HomeAdapter in FragmentAdd. If so, how should I make sure it references the original object.

CodePudding user response：

Issues seems to be the creation of multiple HomeAdapter instance.

You can create the single object using companion object

In FragmentAdd

companion object {var homeAdapter:HomeAdapter?=null}

Then FragmentAdd

homeAdapter = HomeAdapter(FragmentHome(),arrayList)
homeAdapter.updateRecyclerView(arrayList)

In FragmentHome

recyclerView!!.adapter=FragmentAdd.homeAdapter!!