ArrayAdapter use Kotlin android
27,199
Parameter variable cannot be re-assigned, you will need to create a local variable to hold your returned 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
}
Author by
g71132
Updated on June 22, 2020Comments
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g71132 almost 4 years
SoI'm learning kotlin and now I need to write an ArrayAdapter, but I've some error when trying to do this:
convertView = vi.inflate(resource, null)
kotlin is telling me
Val cannot be reassigned
In the site kotline I convert java class to kotlin class and try to do like in this site. Why is there an error and how can I fix this? Here is the whole code.
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 } }