Question

我必须使用Kotlin将ListView的单击项复制到剪贴板管理器。

我尝试过

listView.setOnItemClickListener { parent, view, position, id ->
            val item = listView.selectedItem as String?
            myClip = ClipData.newPlainText("text", item)
            myClipboard?.primaryClip = myClip }

但是它说：

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ListView.setOnItemClickListener(android.widget.AdapterView$OnItemClickListener)' on a null object reference

我使用的ListView

var values = ArrayList<String>()
val adapter = ArrayAdapter(this, R.layout.listview_text_color, values)
listView?.adapter = adapter
adapter.notifyDataSetChanged()

Answer 1

也许您的listview为空。请改用listview?.setOnItemClickListener

Answer 2

解

我没有使用listView布局，而是使用了alertDialog.setAdapter（）。这是代码

     alertDialogList.setAdapter(adapter, DialogInterface.OnClickListener { _, which ->
            val item = adapter.getItem(which) //this is my code to copy clicked items on clipboard
            myClip = ClipData.newPlainText("text", item)
            myClipboard?.primaryClip = myClip
})

Kotlin-将ListView的单击项复制到剪贴板

2 个答案: