有没有办法从长按 ListViewItem 获取类项（使用自定义适配器）

Question

我已经： 一类

class Cars (Val Name String, Val Type String, Val Year String)

可变列表

var listeCars : MutableList<Cars>? = null

带有编辑和删除菜单项的菜单 带有自定义适配器的列表视图 此列表视图已注册为上下文菜单

registerForContextMenu(listView)

override fun onContextItemSelected(item: MenuItem): Boolean {
        val info = item.menuInfo as AdapterContextMenuInfo
        val carx = listeConsultations!![info.position]

// 最后一行不起作用，即使我使用它来代替

val carx = listView.adapter.getItem(info.position) as Car

// 因为我想检索 Car 类项来用它做一些这样的操作，

        return when {
            item.itemId == R.id.menuDelete -> {
                deleteCar(carx)
                true
            }
            item.itemId == R.id.menuEdit -> {
                updateCar(carx)
                true
            }
            else -> super.onContextItemSelected(item)
        }
    }

private fun updateCar(carx: Car?) {
    val builder = AlertDialog.Builder(applicationContext)
    builder.setTitle("Edit Car")
    val inflater = LayoutInflater.from(applicationContext)
    val view = inflater.inflate(R.layout.edit_car,null)
// .....
}

private fun updateCar(carx: Car?) {
// .....
}

Answer 1

override fun onContextItemSelected(item: MenuItem): Boolean {

   when(item){

      is Cars -> {

          //item is Cars Type in this brace
      }
   }

 ...
}

希望这会有所帮助。