用于 ListView 的 Kotlin setOnClickListener

Question

我有以下代码：

class BookListActivity : AppCompatActivity()
{

    var array = arrayOf("Item 1", "Item 2", "Item 3", "Item 4", "Item 5", "Item 6", "Item 7", "Item 8", "Item 9", "Item 10", "Item 11")

    override fun onCreate(savedInstanceState: Bundle?)
    {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.book_list)

        val adapter = ArrayAdapter(this, R.layout.book_list_item, R.id.book_title, array)
        val listView : ListView = findViewById(R.id.book_list)
        listView.adapter = adapter    
    }
}

我需要为 listView 上的每个元素添加一个点击侦听器。

我尝试了以下但不起作用：

listView.setOnItemClickListener
{
    val intent = Intent(this, BookDetailActivity::class.java)
    startActivity(intent)
}

另外我需要知道我点击了什么 ListView 元素。我怎样才能做到这一点？

Answer 1

您必须处理AdapterView.OnItemClickListener 的所有参数

你的听众应该是这样的：

listView.setOnItemClickListener { parent, view, position, id -> 
    val element = adapter.getItemAtPosition(position) // The item that was clicked
    val intent = Intent(this, BookDetailActivity::class.java)
    startActivity(intent)
}

Answer 2

尝试将此解决方案用于列表视图项目单击侦听器。

listView.setOnItemClickListener = AdapterView.OnItemClickListener {parent,view, position, id ->
          // Get the selected item text from ListView
          val selectedItem = parent.getItemAtPosition(position) as String

          val intent = Intent(this, BookDetailActivity::class.java)
          startActivity(intent)
    }