我需要在另一个文本视图中更新微调器文本

Question

我在适配器中有一个微调器，用于获取食物的数量。现在，我想获取微调器文本并将其与价格相乘以获得总价格。我该怎么做？

 override fun onBindViewHolder(holder: View_Holder, position: Int) {
    val data = list[position]
    holder.spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
        override fun onNothingSelected(parent: AdapterView<*>?) {
            holder.spinner.setSelection(1)
        }

        override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
            val text:Int = parent?.getItemAtPosition(position) as Int
            holder.spinner.setSelection(text)
        }

    }
    holder.name.text = data.itemName
    holder.price.text = holder.spinner.onItemSelectedListener.toString()

这是我使用 spinner 的 createviewholder 函数。

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): View_Holder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.single_item, parent, false)
        res_name.text = "Ordering From "+list[0].itemRes
        val adapter = ArrayAdapter.createFromResource(
            context,
            R.array.quantity,
            android.R.layout.simple_spinner_item
        )
        val spinner = view.findViewById<Spinner>(R.id.spinner)
        adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
        spinner.adapter = adapter

                return View_Holder(view)
    }

Answer 1

参考下面的代码会有帮助

override fun onItemSelected(arg0:AdapterView<*>, arg1:View, position: Int, id:Long) {
    val text:String = arg0?.getItemAtPosition(position).toString()
    //you should update view from here 
    holder.name.text = data.itemName
    holder.price.text = "₹ " + data.itemPrice + "/-"
}