I have a recyclerview, and each item in the list has a popup menu allowing the user to duplicate or delete the item. My recyclerview also includes an itemTouch helper to rearrange the item order.
My problem is the following: when an item is duplicated or deleted, I want to notify the recyclerview's adapter (adapter.notifyItemRemoved(position:Int)). But the popup menu is defined in my viewholder. So can I notify the adapter?
In my fragment
myViewModel.aList.observe(viewLifecycleOwner) {
val myAdapter = MyAdapter(it, this)
// simpleCallback defined here. Removed for clarity.
val itemTouchHelper = ItemTouchHelper(simpleCallback)
itemTouchHelper.attachToRecyclerView(binding.myRecyclerView)
binding.myRecyclerView.apply {
layoutManager = LinearLayoutManager(activity)
adapter = theAdapter
}
}
}
My adapter
class myAdapter (
private val aList:List<myItem>,
private val clickListener: myClickListener,
): RecyclerView.Adapter<itemViewHolder>(), ItemTouchHelperAdapter {
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): itemViewHolder{
val from = LayoutInflater.from(parent.context)
val binding = myCellBinding.inflate(from, parent, false)
return itemViewHolder(parent.context, binding,clickListener)
}
override fun onBindViewHolder(holder: myViewHolder, position: Int) {
holder.bindItem(aList[position])
}
override fun getItemCount(): Int = aList.size
}
The viewHolder
class myViewHolder (
private val context: Context,
private val binding: myCellBinding,
private val clickListener: ItemClickListener
) : RecyclerView.ViewHolder(binding.root) {
fun bindItem(item: Item){
// other stuff, removed for clarity
popupMenu(item)
}
private fun popupMenu(item: Item){
val popupMenu = PopupMenu(context,binding.anOptionsMenuButton)
popupMenu.inflate(R.menu.a_menu)
popupMenu.setOnMenuItemClickListener {
when(it.itemId){
R.id.duplicateItemOption -> {
**// DUPLICATE THE ITEM
// HOW TO NOTIFY THE ADAPTER THAT AN ITEM HAS BEEN ADDED?**
true
}
R.id.deleteItemOption -> {
**// DELETETHE ITEM
// HOW TO NOTIFY THE ADAPTER THAT AN ITEM HAS BEEN REMOVED?**
true
}
else -> true
}
}
binding.anOptionsMenuButton.setOnClickListener{
try {
val popup = PopupMenu::class.java.getDeclaredField("mPopup")
popup.isAccessible = true
val menu = popup.get(popupMenu)
menu.javaClass
.getDeclaredMethod("setForceShowIcon", Boolean::class.java)
.invoke(menu, true)
}catch (e:Exception) {
e.printStackTrace()
}finally {
popupMenu.show()
}
true
}
}
}
How to notify the recyclerview adapter (in my fragment) that items have been removed/added when action is executed in the viewHolder popup menu (popupMenu.setOnMenuItemClickListener)? Thanks!
