ArrayAdapter使用Kotlin android

ArrayAdapter use Kotlin android

所以我正在学习kotlin，现在我需要编写一个ArrayAdapter，但是尝试执行此操作时出现了一些错误：

1	convertView = vi.inflate(resource, null)

kotlin告诉我

Val cannot be reassigned

在站点kotline中，我将java类转换为kotlin类，并尝试在此站点中进行操作。为什么会出现错误，我该如何解决？这是完整的代码。

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open class MyAdapter(context: Context, resource: Int, list: ArrayList<MyItems>) :
ArrayAdapter<MyItems>(context, resource, list) {

var resource: Int
var list: ArrayList<MyItems>
var vi: LayoutInflater

init {
this.resource = resource
this.list = list
this.vi = context.getSystemService(Context.LAYOUT_INFLATER_SERVICE) as LayoutInflater
}

override fun getView(position: Int, convertView: View?, parent: ViewGroup): View? {
var holder: ViewHolder

if(convertView == null){
convertView = vi.inflate(resource, null) //error in this line
holder = ViewHolder()

holder.image = convertView.findViewById(R.id.myImage) as ImageView?

convertView.tag(holder) //error in this line

} else {
holder = convertView.tag as ViewHolder
}

return convertView
}

internal class ViewHolder {
var image: ImageView? = null
}

}

无法重新分配参数变量，您将需要创建一个局部变量来保存返回的视图：

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override fun getView(position: Int, convertView: View?, parent: ViewGroup): View? {
var holder: ViewHolder
var retView: View

if(convertView == null){
retView = vi.inflate(resource, null)
holder = ViewHolder()

holder.image = retView.findViewById(R.id.myImage) as ImageView?

retView.tag = holder

} else {
holder = convertView.tag as ViewHolder
retView = convertView
}

return retView
}