因此,我正在学习kotlin,现在我需要编写一个ArrayAdapter,但是在尝试执行此操作时出现了一些错误:
convertView = vi.inflate(resource, null)
Kotlin 告诉我
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。
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
}
}
最佳答案
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 View :
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
}
关于android - ArrayAdapter使用Kotlin android,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/41923557/