Android Kotlin按钮+警报对话框+列表

Question

所以我有这个代码

var firstKitList = mutableListOf<String>("test", "potato", "another item")

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

    val mainKitList = kitListView
    val mainListViewAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, firstKitList)
    mainKitList.adapter = mainListViewAdapter

    newKitListBtn.setOnClickListener {
        // Handler code here.
        val intent = Intent(this, NewKitListActivity::class.java)
        startActivity(intent);
    }
}

对于这种布局.当我点击按钮,为我显示一个警告对话框时,如何添加一个名称(好像我正在创建一个要添加到该列表中的项目),然后转到下一个活动？(此部分已经创建,您可以在代码中看到)

非常感谢

Answer 1

我创建了一个用editText保存警告对话框的函数.单击保存名称时,将存储在multableList中并重定向到新活动.

修改代码

var firstKitList = mutableListOf<String>("test", "potato", "another item")
// Mutable List for holding names
val nameList = mutableListOf<String>()

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

    val mainKitList = kitListView
    val mainListViewAdapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, firstKitList)
    mainKitList.adapter = mainListViewAdapter

    newKitListBtn.setOnClickListener {
        // Show Alert Dialog
        showNewNameDialog()              
    }
}

警报对话框功能

fun showNewNameDialog() {
        val dialogBuilder = AlertDialog.Builder(this)
        val inflater = this.layoutInflater
        val dialogView = inflater.inflate(R.layout.custom_dialog, null)
        dialogBuilder.setView(dialogView)

        val editText = dialogView.findViewById<EditText>(R.id.editTextName) 

        dialogBuilder.setTitle("Custom dialog")
        dialogBuilder.setMessage("Enter Name Below")
        dialogBuilder.setPositiveButton("Save", { dialog, whichButton ->
            //do something with edt.getText().toString();

           // Add Name in list
            nameList.add(editText.text.toString())
            // Handler code here.
            val intent = Intent(this, NewKitListActivity::class.java)
            startActivity(intent);
        })

        dialogBuilder.setNegativeButton("Cancel", { dialog, whichButton ->
            //pass
        })
        val b = dialogBuilder.create()
        b.show()
    }

自定义对话框布局:custom_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp"
    android:orientation="vertical">

    <EditText
        android:id="@+id/editTextName"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="text" />

</LinearLayout>