指定为非空的参数在 ArrayAdaper 中为空

Question

我已经为微调器扩展了 ArrayAdapter：

class OrderAdapter(context: Context, resource: Int, objects: List<Order>) : ArrayAdapter<Order>(context, resource, objects) {
        override fun getView(position: Int, convertView: View?, parent: ViewGroup): View? {
            val view = super.getView(position, convertView, parent)
            view?.let { view.find<TextView>(android.R.id.text1).text = getItem(position).name }
            return view
        }
        override fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View? {
            val view = super.getDropDownView(position, convertView, parent)
            view?.let {view.find<TextView>(android.R.id.text1).text = getItem(position).name }
            return view
        }
    }

我遇到异常：

java.lang.IllegalArgumentException: Parameter specified as non-null is null: method kotlin.jvm.internal.Intrinsics.checkParameterIsNotNull, parameter convertView
                                                                                          at com.github.blabla.endlesss.ui.adapter.OrderAdapter.getView(OrderAdapter.kt:0)

有什么解决办法吗？

Answer 1

请检查以下示例：

override fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View? {
    return getCustomView(position, convertView, parent)
}

override fun getView(position: Int, convertView: View?, parent: ViewGroup): View? {
    return getCustomView(position, convertView, parent)
}

fun getCustomView(position: Int, convertView: View?, parent: ViewGroup): View? {
    val rootView: View? = LayoutInflater.from(context).inflate(R.layout.my_custom_view, parent, false)
    return rootView
}

返回值应该可以为空。

Answer 2

这个问题是由增量编译引起的。从 Java.

转换后只需要重建项目

Answer 3

override fun getView(i: Int, view: View, parent: ViewGroup): View {

var itemView = LayoutInflater.from(context).inflate(R.layout.item_dashbord_data, parent, false)

        return itemView
    }

// 更改视图对象 (itemView) 的名称不同于 getView 第二个对象 (view)。所以将视图更改为 itemView 或其他名称

Answer 4

在我的例子中，我只需要添加“？”到 convertView 参数

override fun getDropDownView(position: Int, convertView: View?, parent: ViewGroup): View {

指定为非空的参数在 ArrayAdaper 中为空

Parameter specified as non-null is null in ArrayAdaper

android

kotlin