listview自定义适配器

class FruitAdapter(activity: Activity ,val id:Int,data:List<Fruit>):ArrayAdapter<Fruit>(activity,id,data){
    inner class ViewHolder(val fruitImage:ImageView,val fruitName:TextView)
    override fun getView(position: Int, convertView: View?, parent: ViewGroup): View {

        val view :View
        val viewHolder:ViewHolder
        if (convertView==null){
            view= LayoutInflater.from(context).inflate(id, parent, false)
            val imageView:ImageView=view.findViewById(R.id.imageView)
            val textView:TextView=view.findViewById(R.id.textView)
            viewHolder=ViewHolder(imageView,textView)
            view.tag=viewHolder
        }else{
            view=convertView
            viewHolder=view.tag as ViewHolder
        }

        val item = getItem(position) //获取当前item实例

        if (item!=null){
            viewHolder.fruitImage .setImageResource(item.imageid)
            viewHolder.fruitName.text = item.name
        }

        return view
    }

}