Recycler View 和 DialogFragment 苦苦挣扎（Kotlin）

Question

您好，我正在使用 recyclerView 滑动并调用 Dialog 片段

这个想法是，当我关闭对话框片段时，原始回到原来的地方 但问题是它会在对话框打开后返回。

所以我不知道如何在 dialogFragment 中调用 notifyItemChanged，或者实现 dialogFragment.setOnDismissListener，因为当我重写时，我不知道如何将适配器传递给函数以调用 notifyItemChanged i

这是我的代码

类 Fragmento : Fragment(), RecyclerAdapter.ClickListener { // TODO：重命名和更改参数类型

private lateinit var adapter :RecyclerAdapter
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    arguments?.let {

    }
}

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?,
                          savedInstanceState: Bundle?): View? {
    // Inflate the layout for this fragment
    val view =inflater.inflate(R.layout.fragment_fragmento, container,false)

    initRecyclerView(view)
    return view

}

private fun initRecyclerView(view: View) {
    val recyclerView = view.findViewById<RecyclerView>(R.id.recyclerView)
    recyclerView.layoutManager=LinearLayoutManager(activity)
    adapter = RecyclerAdapter()
    recyclerView.adapter=adapter
    val itemSwipe=object:ItemTouchHelper.SimpleCallback(0,ItemTouchHelper.LEFT){
        override fun onMove(
             recyclerView: RecyclerView,
            viewHolder: RecyclerView.ViewHolder,
            target: RecyclerView.ViewHolder
        ): Boolean {
        return false
        }

        override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
            showDialog(viewHolder as RecyclerAdapter.ViewHolder)
            var dialog = DialogFragment()
            dialog.show(childFragmentManager,"dialog")
            adapter.notifyItemChanged(viewHolder.adapterPosition)
        }

    }
    val swap =ItemTouchHelper(itemSwipe)
    swap.attachToRecyclerView(recyclerView)

}

private fun showDialog(viewHolder: RecyclerAdapter.ViewHolder){
    val builder= AlertDialog.Builder(activity)
    builder.setTitle("DeleteItem")


}


companion object {
    /**
     * Use this factory method to create a new instance of
     * this fragment using the provided parameters.
     *
     */
    // TODO: Rename and change types and number of parameters
    @JvmStatic
    fun newInstance() =
            Fragmento().apply {
                arguments = Bundle().apply {

                }
            }
}

}

对于 DialogFragment

类 DialogFragment：DialogFragment(){

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
  
    var rootView: View = inflater.inflate(R.layout.dialog_fragment_noticias, container, false)
    return rootView
}

override fun onDismiss(dialog: DialogInterface) {
    super.onDismiss(dialog)

}

}

Answer 1

如果我明白这里的问题是您想在没有 setOnDismissListener 的情况下关闭对话框时调用 notifyItemChanged()。

如果你想这样做，你可以简单地在你的 DialogFragment 上添加一个回调并在你的 recyclerView 中使用它。

class DialogFragment(dismiss: () -> Unit): DialogFragment(){

override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
  
    var rootView: View = inflater.inflate(R.layout.dialog_fragment_noticias, container, false)
    return rootView
}

override fun onDismiss(dialog: DialogInterface) {
    super.onDismiss(dialog)
    dismiss()
}
}

当您创建 DialogFragment 时，您可以使用回调：

override fun onSwiped(viewHolder: RecyclerView.ViewHolder, direction: Int) {
            showDialog(viewHolder as RecyclerAdapter.ViewHolder)
            var dialog = DialogFragment() {
               //here you are notified when the dialog is dismiss
               adapter.notifyItemChanged(viewHolder.adapterPosition)
            }
            dialog.show(childFragmentManager,"dialog")
            adapter.notifyItemChanged(viewHolder.adapterPosition)
        }