Recyclerview 项目在删除时立即删除并重新出现android

Question

我正在尝试从回收站视图中删除一个列表。 问题是当我删除项目时， 它会从列表中删除，但会立即重新出现。 （删除方法有效，所以该项目被删除但仍保留在列表中）

适配器

 inner class AllSongsViewHolder(val binding: RcvLytAllSongsBinding) : RecyclerView.ViewHolder(
    binding.root
){
  init {
    binding.icDelete.setOnClickListener {
    onDeleteItemClickListener?.let { click -> click(song, bindingAdapterPosition)}
  }
 }
}

fun removeSongFromList(songList: List<Songs>, position: Int){
    this.songs = songList
    songList.toMutableList().removeAt(position)
    notifyItemRemoved(position)
    notifyItemRangeChanged(position, songList.size)
}

片段

..........
private var allSongs: List<Songs>? = null

//THIS IS THE VIEWMODEL FOR GETTING ALL ITEMS STORING IN ADAPTER
mainViewModel.mediaItems.observe(viewLifecycleOwner){ result ->
        when(result.status){
        Status.SUCCESS -> {      
        result.data?.let { songs ->
        allSongsAdapter.songs = sortedBy as List<Songs>
        allSongs = song 
  }

allSongsAdapter.setOnDeleteItemClickListener { songx, position -> 
//delete
val contentResolver: ContentResolver = requireContext().contentResolver
songx.songUri?.let { it1 -> contentResolver.delete(it1, null, null) }
Toast.makeText(context, position.toString(), Toast.LENGTH_LONG).show()
//remove song from list
allSongsAdapter.removeSongFromList(allSongsAdapter.songs, position)

我试图从适配器本身做它，没有工作。

Answer 1

好吧，事实上，项目并没有从“原始”数组中删除

songList.toMutableList().removeAt(position)

toMutableList() 正在返回新的可变数组，您将在其中删除 position 的项目，但永远不要将此可变修改后的数组分配给值，“原始”songList 仍然有这个项目。考虑removeSongFromList body 的这个 sn-p：

val newList = songList.toMutableList()
newList.removeAt(position)
this.songs = newList
notifyItemRemoved(position)

这里也不需要notifyItemRangeChanged，没有任何变化，只删除了一项