使用RecycleView的多视图-Kotlin（Android）-无法切换ViewWholder

Question

我想创建一个recyclerview，当它在列表中看到LIQUID作为pid时，它将使用具有自己布局的ViewWholder2。否则，它将使用具有自己布局的viewholder1。

问题是我创建的recyclerview只显示一个ViewWholder。如果位置0 pid为液体，则viewholder为ViewHolder2，即使对于列表上的后续项，pid不再为液体。简而言之，位置0上的pid值将指示整个列表的查看器。

我还在揣摩RecolyerView的曲折，还没有完全理解。

类MyOrderCart（var MyOrder：MutableList,var MyMutableList：MutableList）：RecyclerView.Adapter（）{

inner class ViewHolder1(itemView: View) : RecyclerView.ViewHolder(itemView) {

    fun bindView1(mycartlist: MyOrderList){
        itemView.nameView.text = mycartlist.name
        itemView.sizeView.text = "Size: ${mycartlist.size}"

        var iprice = mycartlist.price
        itemView.priceView.text = "Price: $iprice"
        var icount = mycartlist.count
        itemView.countView.text = "Count: $icount"
        var itotal = mycartlist.itemtotal
        itemView.itemtotalView.text = "Subtotal: $itotal"

        var image_checkout = itemView.findViewById(R.id.image_checkout) as ImageView
        var checkout_deletebutton = itemView.findViewById(R.id.checkout_deletebutton) as ImageButton
        var checkout_editcount = itemView.findViewById(R.id.checkout_editcount) as ImageButton
        var mytime = System.currentTimeMillis()

        try {
            Glide.with(image_checkout.getContext()).load(mycarthtml" target="_blank">list.imageUrl)
                .signature(ObjectKey(mytime)).into(image_checkout)
                .clearOnDetach()
        } finally {
            image_checkout.setImageResource(R.drawable.noimage)
        }
    }
}
inner class ViewHolder2(itemView: View) : RecyclerView.ViewHolder(itemView) {
    fun bindView2(mycartlist: MyOrderList){
        itemView.checkout_inside_textview.text = mycartlist.pid
    }
}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
    var myorderviewtype = myOrder.get(viewType)
        return when (myorderviewtype.pid) {
            "LIQUOR" -> {
                ViewHolder2(
                    LayoutInflater.from(parent.context)
                        .inflate(R.layout.insidecheckout_label, parent, false)
                )
            }
            "NOODLES" -> {
                ViewHolder2(
                    LayoutInflater.from(parent.context)
                        .inflate(R.layout.insidecheckout_label, parent, false)
                )
            }
            else -> {
                ViewHolder1(
                    LayoutInflater.from(parent.context)
                        .inflate(R.layout.layout_insidecheckout, parent, false)
                )
            }
        }
}

override fun onBindViewHolder(viewHolder: RecyclerView.ViewHolder, position: Int) {
    val gsonRaw = GsonBuilder().create()
    var pos = viewHolder.getAdapterPosition()
    var mycartlist: MyOrderList = myOrder.get(position)
    when (viewHolder) {
        is ViewHolder2 -> {
            val liquorviewHolder = viewHolder as ViewHolder2
            liquorviewHolder.bindView2(mycartlist)
        }
        is ViewHolder1 -> {
            val liquorviewHolder = viewHolder as ViewHolder1
            liquorviewHolder.bindView1(mycartlist)
        }
    }

}

Answer 1

在适配器类中，需要重写GetItemViewType方法。像这样：

override fun getItemViewType(position: Int): Int {
    // return view type according to position
    // get your pid using position
    // return 0 for "LIQUOR", 1 for "NOODLES" and 2 for anything else
    // you have to return an integer value only, according to the method signature
}

然后，在OnCreateViewWholder方法中，使用类型为int的viewType参数来膨胀所需的视图：

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {

    return when (viewType) {
        0 -> {
            ViewHolder2(
                LayoutInflater.from(parent.context)
                    .inflate(R.layout.insidecheckout_label, parent, false)
            )
        }
        1 -> {
            ViewHolder2(
                LayoutInflater.from(parent.context)
                    .inflate(R.layout.insidecheckout_label, parent, false)
            )
        }
        else -> {
            ViewHolder1(
                LayoutInflater.from(parent.context)
                    .inflate(R.layout.layout_insidecheckout, parent, false)
            )
        }
    }

}