将回收者视图中显示的选中复选框的项目保存在列表中 [英] Save items of checked checkboxes displayed in recycler view in a list

问题描述

我设法在带有 checkboxes 的 recycler view 中显示存储在房间数据库中的项目，我想将选中的项目存储在列表中，以存储选中的项目列表中的项目我在复选框上使用 setOnClickListener，就像适配器中的下面代码一样，但是当我单击以显示列表时应用程序会停止，或者即使列表成功显示有时也会在我单击时停止项目的复选框(有关信息，当我删除侦听器时，列表显示良好，我可以单击 checkboxes 并且一切正常，但问题是当我添加侦听器以存储选中的项目时).

I manage to display the items stored in a room database in a recycler view with checkboxes and i want to store the checked items in a list, to store the checked items on a list I use setOnClickListener on the checkbox like the code below in adapter but the application stop when i click to display the list or even if the list displayed with success sometimes it stops when i click on the checkbox of an item (for information when i remove the listener the list is displayed well and I can click on the checkboxes and everything works well but the problem is when i add the listener to store the checked items).

    class Adapter (val selectedFluxs : MutableList<Flux>)  : RecyclerView.Adapter<Adapter.VH>(
) {
    class VH(itemView: View) : RecyclerView.ViewHolder(itemView){
        lateinit var feed : Flux
    }
    var allFluxs : List<Flux> = listOf()
    

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): VH {
        val v = LayoutInflater
            .from(parent.getContext())
            .inflate(R.layout.item_layout, parent, false)
        val holder = VH( v )

        v.check.setOnClickListener( ) {
           // it as CheckBox
            if( v.check.isChecked ){
                selectedFluxs.add ( holder.feed )
            }else{
                selectedFluxs.remove( holder.feed )
            }
        }
        return holder
    }

    override fun getItemCount(): Int {
        return allFluxs.size
    }
    fun setFlux( allFlux : List<Flux> ) {
        this.allFluxs = allFlux
        notifyDataSetChanged()
    }
    override fun onBindViewHolder(holder: VH, position: Int) {
        holder.itemView.apply {
            Source.text = allFluxs[position].source
            Tag.text = allFluxs[position].tag
            Url.text = allFluxs[position].adr
           
            check.isChecked =
                holder.feed in selectedFluxs
        }
    }
}







 

推荐答案

我发帖一分钟就解决了问题，其实问题是我没有初始化变量:lateinit var feed: Flux 在 onBindViewHolder 方法中使用: holder.feed = allFluxs[position] .我做到了，并且有效.

I solved the problem a minute after posting the question, in fact the problem is that I did not initialize the variable : lateinit var feed: Flux of the Holder with : holder.feed = allFluxs[position] in the onBindViewHolder method . i did that and it works .

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