应用程序崩溃，因为尚未在 android studio 中初始化后期 init 属性

问题描述

我有一个按钮，当我点击它时，它应该显示警报对话框，但是当我点击那个按钮时应用程序崩溃了我知道代码流是这样，但我不知道我在哪里做错了

>

      private lateinit var btn: Button
      
 override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dynam)
        btn = findViewById(R.id.add1)
        buildDialog()

        btn.setonClickListener(object : View.OnClickListener {
            override fun onClick(v: View?) {
              dialog.show()
            }
        })
    }

    private fun buildDialog() {
        val builder=android.app.AlertDialog.Builder(this)
        val view=layoutInflater.inflate(R.layout.dialog_dynam,null)
      val name=  view.findViewById<EditText>(R.id.nameEdit)
        builder.setView(view)
        builder.setTitle("Enter name")
            .setPositiveButton("Ok",object :DialogInterface.OnClickListener{
                override fun onClick(dialog: DialogInterface?,p1: Int) {
addname(name.text.toString())

                }`

解决方法

我认为您将 dialog 作为 lateinit 变量而您忘记在 buildDialog 函数中对其进行赋值。

      private lateinit var btn: Button
      private lateinit var dialog:AlertDialog

      
      override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_dynam)
        btn = findViewById(R.id.add1)
        buildDialog()

        btn.setOnClickListener(object : View.OnClickListener {
            override fun onClick(v: View?) {
         if (this@YourActivity::dialog.isInitialized) { // to check if dialog is initialize or not
          dialog.show()
         }
            
            }
        })
    }

    private fun buildDialog() {
        val builder=android.app.AlertDialog.Builder(this)
        val view=layoutInflater.inflate(R.layout.dialog_dynam,null)
        val name=  view.findViewById<EditText>(R.id.nameEdit)
        builder.setView(view)
        builder.setTitle("Enter name")
            .setPositiveButton("Ok",object :DialogInterface.OnClickListener{
                override fun onClick(dialog: DialogInterface?,p1: Int) {
                addname(name.text.toString())

        // initialize dialog
        dialog = builder.create()
                }