我的Kotlin代码总是出现“指定的子级已经有父级”错误

Question

我试图做一个问答应用程序，在那里你点击加号按钮来添加一个问答。屏幕上弹出一个按钮，你可以点击它来播放或编辑测验。当我点击新创建的按钮一次很好，但第二次点击它时，应用程序崩溃了。有人知道我如何专门修复这个错误吗？

    package com.example.k_ari

import android.content.Intent
import android.graphics.Color
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.util.Log
import android.view.Gravity
import android.view.ViewGroup
import android.widget.Button
import android.widget.EditText
import android.widget.LinearLayout
import androidx.appcompat.app.AlertDialog
import com.google.android.material.floatingactionbutton.FloatingActionButton

class MainActivity : AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        showEditTextDialogue()
    }

    private fun showEditTextDialogue() {
        val btn = findViewById<FloatingActionButton>(R.id.btn)
        btn.setOnClickListener{

            val inflator = layoutInflater
            val layout = findViewById<LinearLayout>(R.id.mainlayout)
            val dialogLayout = inflator.inflate(R.layout.edit_text_layout, null)
            val editText = dialogLayout.findViewById<EditText>(R.id.et_editText)
            val builder = AlertDialog.Builder(this)
            val newbutton = Button(this@MainActivity)
            val btnintent = Intent(this, Newbtn::class.java)
            val dialogLayout2 = inflator.inflate(R.layout.new_button_option, null)

            newbutton.layoutParams = LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT)
            newbutton.width=1010
            newbutton.height=300
            newbutton.gravity = Gravity.CENTER
            newbutton.translationX= 65F
            newbutton.setTextColor(Color.parseColor("#FFFFFFFF"))
            newbutton.setBackgroundColor(Color.parseColor("#250A43"))

            with(builder) {
                setTitle("Title:")
                setPositiveButton("Ok"){dialog, which ->
                    layout.addView(newbutton)
                    newbutton.text = editText.text.toString()
                }
                setNegativeButton("Cancel"){dialog, which ->
                    Log.d("Main", "Negative button clicked")
                }
                setView(dialogLayout)
                show()
            }
            newbutton.setOnClickListener{
                with(builder){
                    setPositiveButton("Play"){dialog, which ->
                        startActivity(btnintent)
                    }
                    setPositiveButton("Edit"){dialog, which ->
                        startActivity(btnintent)
                    }
                    setView(dialogLayout2)
                    show()
            }
        }
    }
}}

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

    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:id="@+id/btn"
        android:layout_width="wrap_content"
        android:layout_height="56dp"
        android:backgroundTint="#250A43"
        android:backgroundTintMode="add"
        android:clickable="true"
        android:contentDescription="@string/todo"
        android:tint="#250A43"
        android:translationX="280dp"
        android:translationY="580dp"
        app:backgroundTint="#250A43"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.56"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:rippleColor="#FFFFFF"
        app:srcCompat="@android:drawable/ic_input_add"
        android:focusable="true" />
    <ScrollView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

        <LinearLayout
            android:layout_width="match_parent"
            android:id="@+id/mainlayout"
            android:layout_height="wrap_content"
            android:orientation="vertical">
        </LinearLayout>
    </ScrollView>

</LinearLayout>

2020-12-28 13:48:47.521 266 48-26648/com.example.k_ari E/AndroidRuntime：致命异常：main process:com.example.k_ari,PID:26648 java.lang.IllegalStateException：指定的子进程已经有父进程。必须首先调用子级父级的removeView（）。在Androidx.appcomp.appcomp.app.AlertController.setupCustomContent（AlertController.java:657)在Androidx.appcomp.app.comp.app.AlertController.java:475)在Androidx.appcomp.app.alertController.java:233)在Androidx.appcomp.app.comp.app.alertDialog.onCreate（AlertDialog.java:279)在Android.view.viewgroup.addViewWinner（adp.dialog.dispatchoncreate(dialog.java:708)在Android.app.dialog.show(dialog.java:422)在Androidx.appcompat.app.alertdialog$builder.show(alertdialog.java:1009)在com.example.k_ari.mainactivity$showwedittextDialog.java:1$2.2.onclick（mainactivity.kt:66)在Android.widget.textview.performclick（在Android.view.view$PerformClick.r在Android.os.handler.handleCallback（handler.java:938)在Android.os.handler.dispatchMessage（handler.java:99)在Android.os.handler.dispatchMessage（handler.java:246)在Android.app.activityThread.loop（looper.java:246)在Android.app.activityThread.main（activityThread.java:8414)在java.lang.reflect.Method.invoke（原生方法）在30）

Answer 1

您遇到这种崩溃的原因是因为您的新按钮在这里使用了两次相同的视图：

 newbutton.setOnClickListener{
            with(builder){
                setPositiveButton("Play"){dialog, which ->
                    startActivity(btnintent)
                }
                setPositiveButton("Edit"){dialog, which ->
                    startActivity(btnintent)
                }
                setView(dialogLayout2)
                show()
        }

这里，当单击添加按钮时，DialogLayout2会膨胀，并立即将单击监听器添加到新创建的按钮中。最初DialogLayout2没有父级，直到第一次单击new按钮时，第二次单击DialogLayout2已经有了父级，因此它崩溃了。可能的解决方案是在new按钮单击listener中放大警报对话框布局，如下所示：

newbutton.setOnClickListener{
            val dialogLayout2 = inflator.inflate(R.layout.new_button_option, null)
            with(builder){
                setPositiveButton("Play"){dialog, which ->
                    startActivity(btnintent)
                }
                setPositiveButton("Edit"){dialog, which ->
                    startActivity(btnintent)
                }
                setView(dialogLayout2)
                show()
        }
    }