Android Kotlin将微调器值传递给可变列表 [英] Android Kotlin pass spinner values to mutable list

问题描述

我有一个带有微调器的应用程序，其中包含多个项目. 我创建了所有这些

I have an application with a spinner that contains several items. I created it and all that

谁能给我一个例子，说明如何将这些值传递给我拥有的列表?使用mutableList吗?

Could anyone give me an example of how I can pass these values to a list I have? Using a mutableList?

欢呼

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<*>) {

        }
    }

推荐答案

我相信您可以这样做. 1.制作一个或多个自定义适配器 2.创建第一个包含字符串值的列表 3.创建一个包含选定值的可变列表 4.首次加载微调器时，它将从第一个适配器和列表中加载值 5.当用户选择项目时，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负载值(我不确定最后一个是否需要通知对适配器的更改)

I believe you can do like this. 1. Make custom adapter or adapters 2. Make first list which hold string values 3. Make mutable list which holds selected values 4. when spinner loaded first time it load values from first adapter and list 5. when user select item it clear first adapter then notify changes then set new adapter load values from mutable list ( I am not sure last will require to notify changes to adapter)

//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


            }

        }

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