Question

我有一个带有微调器的应用程序，其中包含多个项目。我创造了它和所有

有人能举例说明我如何将这些值传递给我的列表吗？使用mutableList？

干杯

class NewKitListActivity : AppCompatActivity() {

var spinnerArray = arrayOf("Dumbell", "Punching Bag", "Yoga Ball", "Skipping Rope")

 val kitMutableList = mutableListOf(spinnerArray)





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



    val spinner = newKitItemSpinner
    val spinnerArrayAdapter = ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, spinnerArray)
    //selected item will look like a spinner set from XML
    spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
    spinner.adapter = spinnerArrayAdapter

    spinner.onItemSelectedListener = object : OnItemSelectedListener {
        override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
            val selectedItem = parent.getItemAtPosition(position).toString()
            if (selectedItem == "Dumbell") {

               // mutableListAdapter.toMutableList()
                //mutableList.adapter = mutableListAdapter


            }
        } // to close the onItemSelected

        override fun onNothingSelected(parent: AdapterView<*>) {

        }
    }

Answer 1

我相信你可以这样做。 1.制作自定义适配器或适配器 2.制作包含字符串值的第一个列表 3.制作包含所选值的可变列表 4.第一次加载微调器时，它从第一个适配器和列表加载值 5.当用户选择项目时，它清除第一个适配器，然后通知更改，然后从可变列表中设置新的适配器加载值（我不确定最后是否需要通知对适配器的更改）

//Mutable List for storing selected items

val selectedItems: MutableList<String>? = null 

 //Listen On select for spinner

        spinner.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {

            //Performing action onItemSelected and onNothing selected
            override fun onItemSelected(arg0: AdapterView<*>, arg1: View, position: Int, id: Long) {

               // Add selected item in Mutable List
               selectedItems.add(spinnerArray[position])

               // Clear Adapter
                spinner.adapter = null
                // Notify data set changed
                spinnerArrayAdapter.notifyDataSetChanged()
               // Set New Data adapter
               spinner.adapter = ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, selectedItems)


            }

            override fun onNothingSelected(arg0: AdapterView<*>) {
                // TODO: Auto-generated method stub


            }

        }

Answer 2

创建一个列表来存储selectedItems：

val selectedItems = mutableListOf<String>()

然后在选中项目时添加项目：

   override fun onItemSelected(arg0: AdapterView<*>, arg1: View, position: Int, id: Long) {

           selectedItems.add(spinnerArray[position])

   }

Android Koltin将微调器值传递给可变列表

2 个答案: