blocks|key|4540624|text|错误消息指出了您应该执行的操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4540625|//+TEXTVIEW
if(tv.getParent()+!=+null)+{
++++((ViewGroup)tv.getParent()).removeView(tv);+//+<-+fix
}
layout.addView(tv);+//++<==========++ERROR+IN+THIS+LINE+DURING+2ND+RUN
//+EDITTEXT|code-block|syntax|javascript|4540626|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The error message says what You should do.

<pre><code>// TEXTVIEW
if(tv.getParent() != null) {
 ((ViewGroup)tv.getParent()).removeView(tv); // &lt;- fix
}
layout.addView(tv); // &lt;========== ERROR IN THIS LINE DURING 2ND RUN
// EDITTEXT
</code></pre>

blocks|key|4540665|text|我来这里用我的回收视图搜索错误，但解决方案不起作用(显然)。我已经写了它的原因和解决方案的情况下回收视图。希望这能帮助到别人。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4540666|如果在onCreateViewHolder()中遵循以下方法，则会导致错误：|offset|length|style|CODE|4540667|layoutInflater+=+LayoutInflater.from(context);
return+new+VH(layoutInflater.inflate(R.layout.single_row,+parent));|code-block|syntax|javascript|4540668|相反，它应该是|4540669|return+new+VH(layoutInflater.inflate(R.layout.single_row,+null));|4540670|entityMap^0|0|3|K|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|W|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|X|8|@]|9|@]|A|$]]|$1|O|3|P|5|J|7|Y|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

I came here on searching the error with my recyclerview but the solution didn't work (obviously). I have written the cause and the solution for it in case of recyclerview. Hope it helps someone.

The error is caused if in the <code>onCreateViewHolder()</code> the following method is followed:

<pre><code>layoutInflater = LayoutInflater.from(context);
return new VH(layoutInflater.inflate(R.layout.single_row, parent));
</code></pre>

Instead it should be 

<pre><code>return new VH(layoutInflater.inflate(R.layout.single_row, null));
</code></pre>

blocks|key|4540688|text|我找到了另一个解决方法：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4540689|if+(mView.getParent()+==+null)+{
++++++++++++++++++++myDialog+=+new+Dialog(MainActivity.this);
++++++++++++++++++++myDialog.setContentView(mView);
++++++++++++++++++++createAlgorithmDialog();
++++++++++++++++}+else+{
++++++++++++++++++++createAlgorithmDialog();
++++++++++++++++}|code-block|syntax|javascript|4540690|在这里，我只使用了一条if语句来检查视图是否有父级，如果没有创建新的对话框，则在"createAlgorithmDialog()“方法中设置contentView并显示对话框。|4540691|这也用onClickListeners设置了正和负按钮(ok和cancel按钮)。|4540692|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

I found another fix:

<pre><code>if (mView.getParent() == null) {
 myDialog = new Dialog(MainActivity.this);
 myDialog.setContentView(mView);
 createAlgorithmDialog();
 } else {
 createAlgorithmDialog();
 }
</code></pre>

Here i just have an if statement check if the view had a parent and if it didn't Create the new dialog, set the contentView and show the dialog in my "createAlgorithmDialog()" method.

This also sets the positive and negative buttons (ok and cancel buttons) up with onClickListeners.

blocks|key|33455|text|您可以使用此方法检查视图是否有子视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33456|public+static+boolean+hasChildren(ViewGroup+viewGroup)+{
++++return+viewGroup.getChildCount()+>+0;
+}|code-block|syntax|javascript|33457|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You can use this methode to check if a view has children or not .

<pre><code>public static boolean hasChildren(ViewGroup viewGroup) {
 return viewGroup.getChildCount() &gt; 0;
 }
</code></pre>

blocks|key|4540814|text|如果其他解决方案不起作用，如：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4540815|View+view+=+inflater.inflate(R.layout.child_layout_to_merge,+parent_layout,+false);|code-block|syntax|javascript|4540816|检查从fragment的onCreateView返回的内容是单视图还是视图组？在我的例子中，我在片段的xml根上有viewpager，我返回viewpager，当我在布局中添加viewgroup时，我没有更新我现在必须返回viewgroup，而不是viewpager(view)。|4540817|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If other solution is not working like:

<pre><code>View view = inflater.inflate(R.layout.child_layout_to_merge, parent_layout, false);
</code></pre>

check for what are you returning from onCreateView of fragment is it single view or viewgroup? in my case I had viewpager on root of xml of fragment and I was returning viewpager, when i added viewgroup in layout i didnt updated that i have to return viewgroup now, not viewpager(view).

blocks|key|4540848|text|检查是否已添加视图|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4540849|if+(textView.getParent()+==+null)
++++layout.addView(textView);|code-block|syntax|javascript|4540850|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

check if you already added the view

<pre><code>if (textView.getParent() == null)
 layout.addView(textView);
</code></pre>

blocks|key|4540868|text|下面的代码为我解决了这个问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4540869|@Override
public+void+onDestroyView()+{
++++if+(getView()+!=+null)+{
++++++++ViewGroup+parent+=+(ViewGroup)+getView().getParent();
++++++++parent.removeAllViews();
++++}
++++super.onDestroyView();
}|code-block|syntax|javascript|4540870|注意:这个错误来自我的fragment类，通过像这样覆盖onDestroy方法，我可以解决它。|4540871|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

The code below solved it for me:

<pre><code>@Override
public void onDestroyView() {
 if (getView() != null) {
 ViewGroup parent = (ViewGroup) getView().getParent();
 parent.removeAllViews();
 }
 super.onDestroyView();
}
</code></pre>

Note: The error was from my fragment class and by overriding the onDestroy method like this, I could solve it.

blocks|key|33611|text|frameLayout.addView(bannerAdView)；<-如果此行出现错误，请执行下面的操作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33612|if+(bannerAdView.getParent()+!=+null)

++((ViewGroup)+bannerAdView.getParent()).removeView(bannerAdView);

+++frameLayout.addView(bannerAdView);+++++<------+now+added+view|code-block|syntax|javascript|33613|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

frameLayout.addView(bannerAdView); &lt;----- if you get error on this line the do like below..

<pre><code>if (bannerAdView.getParent() != null)

 ((ViewGroup) bannerAdView.getParent()).removeView(bannerAdView);

 frameLayout.addView(bannerAdView); &lt;------ now added view
</code></pre>

blocks|key|4540926|text|if(tv!=+null){
++++((ViewGroup)tv.getParent()).removeView(tv);+//+<-+fix
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4540927|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>if(tv!= null){
 ((ViewGroup)tv.getParent()).removeView(tv); // &lt;- fix
}
</code></pre>

blocks|key|33688|text|我的情况不同，子视图已经有了父视图，我正在将父视图中的子视图添加到不同的父视图中。下面的示例代码|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33689|<?xml+version="1.0"+encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"+android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/lineGap"
>
<TextView
++++android:layout_width="wrap_content"
++++android:layout_height="wrap_content"
++++android:textColor="@color/black1"
++++android:layout_gravity="center"
++++android:gravity="center"
++++/>

</LinearLayout>|code-block|syntax|javascript|33690|我膨胀了这个视图并添加到另一个LinearLayout，然后我从上面的布局中删除了LinaarLayout，它开始工作了|33691|下面的代码修复了这个问题：|33692|<?xml+version="1.0"+encoding="utf-8"?>
<TextView+xmlns:android="http://schemas.android.com/apk/res/android"
+++android:layout_width="wrap_content"
+++android:layout_height="wrap_content"
+++android:gravity="center"
+++android:textColor="@color/black1"+/>|33693|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

My case was different the child view already had a parent view i am adding the child view inside parent view to different parent. example code below

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="@dimen/lineGap"
&gt;
&lt;TextView
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:textColor="@color/black1"
 android:layout_gravity="center"
 android:gravity="center"
 /&gt;

&lt;/LinearLayout&gt;
</code></pre>

And i was inflating this view and adding to another LinearLayout, then i removed the LinaarLayout from the above layout and its started working 

below code fixed the issue: 

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;TextView xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:gravity="center"
 android:textColor="@color/black1" /&gt;
</code></pre>

blocks|key|33704|text|我的错误是这样定义视图：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|33705|view+=+inflater.inflate(R.layout.qr_fragment,+container);|code-block|syntax|javascript|33706|它丢失了：|33707|view+=+inflater.inflate(R.layout.qr_fragment,+container,+false);|33708|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

My error was define the view like this:

<pre><code>view = inflater.inflate(R.layout.qr_fragment, container);
</code></pre>

It was missing:

<pre><code>view = inflater.inflate(R.layout.qr_fragment, container, false);
</code></pre>

blocks|key|4541025|text|在我的例子中，当我想要将父视图添加到其他视图时，就会发生这种情况|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4541026|View+root+=+inflater.inflate(R.layout.single,+null);
LinearLayout+lyt+=+root.findViewById(R.id.lytRoot);
lytAll.addView(lyt);++//+->++crash|code-block|syntax|javascript|4541027|您必须像这样添加父视图|4541028|View+root+=+inflater.inflate(R.layout.single,+null);
LinearLayout+lyt+=+root.findViewById(R.id.lytRoot);
lytAll.addView(root);|4541029|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In my case it happens when i want add view by parent to other view

<pre><code>View root = inflater.inflate(R.layout.single, null);
LinearLayout lyt = root.findViewById(R.id.lytRoot);
lytAll.addView(lyt); // -&gt; crash
</code></pre>

you must add parent view like this

<pre><code>View root = inflater.inflate(R.layout.single, null);
LinearLayout lyt = root.findViewById(R.id.lytRoot);
lytAll.addView(root);
</code></pre>

blocks|key|4541072|text|必须首先从其父视图中删除子视图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4541073|如果您的项目是在Kotlin中，那么您的解决方案看起来与Java略有不同。Kotlin使用as?简化了强制转换，如果左侧为null或强制转换失败，则返回null。|offset|length|style|CODE|4541074|(childView.parent+as?+ViewGroup)?.removeView(childView)
newParent.addView(childView)|code-block|syntax|javascript|4541075|Kotlin扩展解决方案|4541076|如果您需要多次执行此操作，请添加此扩展以使代码更具可读性。|4541077|childView.removeSelf()

fun+View?.removeSelf()+{
++++this+?:+return
++++val+parentView+=+parent+as?+ViewGroup+?:+return
++++parentView.removeView(this)
}|4541078|如果此视图为null、父视图为null或父视图不是ViewGroup，它将安全地不执行任何操作|4541079|entityMap^0|0|19|3|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@$D|Y|E|Z|F|G]]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|12|8|@]|9|@]|A|$]]|$1|Q|3|R|5|J|7|13|8|@]|9|@]|A|$K|L]]|$1|S|3|T|5|6|7|14|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|V|$]]

You must first remove the child view from its parent.

If your project is in Kotlin, your solution will look slightly different than Java. Kotlin simplifies casting with <code>as?</code>, returning null if left side is null or cast fails.

<pre><code>(childView.parent as? ViewGroup)?.removeView(childView)
newParent.addView(childView)
</code></pre>

<h3>Kotlin Extension Solution</h3>

If you need to do this more than once, add this extension to make your code more readable.

<pre><code>childView.removeSelf()

fun View?.removeSelf() {
 this ?: return
 val parentView = parent as? ViewGroup ?: return
 parentView.removeView(this)
}
</code></pre>

It will safely do nothing if this View is null, parent view is null, or parent view is not a ViewGroup

blocks|key|4541119|text|我的问题与其他许多答案有关，但需要做出改变的原因略有不同……我正在尝试将活动转换为片段。所以我把膨胀代码从onCreate移到了onCreateView，但是我忘记了从setContentView转换成膨胀方法，同样的IllegalStateException把我带到了这个页面。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4541120|我改变了这一点：|4541121|binding+=+DataBindingUtil.setContentView(requireActivity(),+R.layout.my_fragment)|code-block|syntax|javascript|4541122|要这样做：|4541123|binding+=+DataBindingUtil.inflate(inflater,+R.layout.my_fragment,+container,+false)|4541124|这就解决了问题。|4541125|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|L|5|F|7|U|8|@]|9|@]|A|$G|H]]|$1|M|3|N|5|6|7|V|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

My problem is related to many of the other answers, but a little bit different reason for needing to make the change... I was trying to convert an Activity to a Fragment. So I moved the inflate code from onCreate to onCreateView, but I forgot to convert from setContentView to the inflate method, and the same IllegalStateException brought me to this page.

I changed this:

<pre><code>binding = DataBindingUtil.setContentView(requireActivity(), R.layout.my_fragment)
</code></pre>

to this:

<pre><code>binding = DataBindingUtil.inflate(inflater, R.layout.my_fragment, container, false)
</code></pre>

That solved the problem.

blocks|key|4541160|text|当我对活动和片段使用数据绑定时，就发生了这种情况。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4541161|对于fragment+-+in+onCreateView，我们可以使用充气器以传统的方式对布局进行膨胀。在onViewCreated方法中，绑定对象可以更新为|4541162|+binding+=+DataBindingUtil.getBinding<FragmentReceiverBinding>(view)+as+FragmentReceiverBinding|code-block|syntax|javascript|4541163|它解决了我的问题|4541164|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|O|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|P|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

It happened with me when I was using Databinding for Activity and Fragments.
For fragment - in onCreateView we can inflate the layout in traditional way using inflater.
and in onViewCreated method, binding object can be updated as
<pre><code> binding = DataBindingUtil.getBinding&lt;FragmentReceiverBinding&gt;(view) as FragmentReceiverBinding
</code></pre>
It solved my issue

blocks|key|4541185|text|在我的例子中，我是这样做的(错误的)：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4541186|...
TextView+content+=+new+TextView(context);
for+(Quote+quote+:+favQuotes)+{
++content.setText(quote.content);
...|code-block|syntax|javascript|4541187|而不是(好)：|4541188|...
for+(Quote+quote+:+favQuotes)+{
++TextView+content+=+new+TextView(context);
++content.setText(quote.content);
...|4541189|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

In my case, I was doing this (wrong):
<pre><code>...
TextView content = new TextView(context);
for (Quote quote : favQuotes) {
 content.setText(quote.content);
...
</code></pre>
instead of (good):
<pre><code>...
for (Quote quote : favQuotes) {
 TextView content = new TextView(context);
 content.setText(quote.content);
...
</code></pre>

blocks|key|4541214|text|如果在XML中使用id+"root“布局有问题，只需更改id名称|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4541215|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If in your XML you have layout with id &quot;root&quot; It`s problem, just change id name

blocks|key|34035|text|我也面临着同样的错误，看看我在做什么。我的错误是，我试图将相同的视图NativeAdView添加到多个FrameLayouts中，通过为每个FrameLayout创建单独的视图NativeAdView来解决这个问题，谢谢|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|34036|entityMap^0|Y|C|1F|C|1Y|B|2G|C|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]|$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|G|$]]

I was facing the same error, and look what I was doing. My bad, I was trying to add the same view <code>NativeAdView</code> to the multiple <code>FrameLayouts</code>, resolved by creating a separate view <code>NativeAdView</code> for each <code>FrameLayout</code>, Thanks

blocks|key|4541318|text|在我的例子中，我意外地从Layout.onCreateView()中返回了一个子视图，如下所示：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4541319|@Override
public+View+onCreateView(LayoutInflater+inflater,+ViewGroup+container,+Bundle+savedInstanceState)+{
++++View+v=+inflater.inflate(R.layout.activity_deliveries,+container,+false);
++++RecyclerView+rv++=+(RecyclerView)+v.findViewById(R.id.deliver_list);
++++
++++return+rv;+//+<-+here's+the+issue
}|code-block|syntax|javascript|4541320|解决方案是返回父视图(v)而不是子视图(rv)。|4541321|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In my case I was accidentally returning a child view from within Layout.onCreateView() as shown below:
<pre><code>@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
 View v= inflater.inflate(R.layout.activity_deliveries, container, false);
 RecyclerView rv = (RecyclerView) v.findViewById(R.id.deliver_list);
 
 return rv; // &lt;- here's the issue
}
</code></pre>
The solution was to return the parent view (v) instead of the child view (rv).

blocks|key|34109|text|简化为KOTLIN|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34110|+viewToRemove?.apply+{
++++++++++++if+(parent+!=+null)+{
++++++++++++++++(parent+as+ViewGroup).removeView(this)
++++++++++++}
++++++++}|code-block|syntax|javascript|34111|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<h2>Simplified in KOTLIN</h2>
<pre><code> viewToRemove?.apply {
 if (parent != null) {
 (parent as ViewGroup).removeView(this)
 }
 }
</code></pre>

blocks|key|34134|text|您只需要传递attachToRoot参数false即可。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34135|mBinding+=+FragmentCategoryBinding.inflate(inflater,+container,+false)|code-block|syntax|javascript|34136|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

You just need to pass attachToRoot parameter false.
<pre><code>mBinding = FragmentCategoryBinding.inflate(inflater, container, false)
</code></pre>

blocks|key|34155|text|在我的例子中，我将id命名为约束布局的"+root“，这与现有的父根id冲突。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34156|尝试更改id。|34157|<androidx.constraintlayout.widget.ConstraintLayout
++++++++++++android:id="@%2Bid/root"++//<--It+should+not+named+as+root.
++++++++++++android:layout_width="match_parent"
++++++++++++android:layout_height="match_parent"

</androidx.constraintlayout.widget.ConstraintLayout>|code-block|syntax|javascript|34158|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

In my case, I had id named as &quot;root&quot; for constraint layout, which was conflicting the existing parent root id.
Try to change the id.
<pre><code>&lt;androidx.constraintlayout.widget.ConstraintLayout
 android:id=&quot;@+id/root&quot; //&lt;--It should not named as root.
 android:layout_width=&quot;match_parent&quot;
 android:layout_height=&quot;match_parent&quot;

&lt;/androidx.constraintlayout.widget.ConstraintLayout&gt;
</code></pre>

blocks|key|34177|text|如果您使用的是ViewBinding，请确保您引用的是正确的绑定！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|34178|当我试图在一个活动中扩展一个自定义对话框时，我遇到了这个问题：|34179|AlertDialog.Builder+builder+=+new+AlertDialog.Builder(this);

final+AlertBinding+alertBinding+=+AlertBinding.inflate(LayoutInflater.from(this),+null,+false);

builder.setView(binding.getRoot());+//+<---+I+was+using+binding+(which+is+my+Activity's+binding),+instead+of+alertBinding.|code-block|syntax|javascript|34180|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

If you're using ViewBinding, make sure you're referring to the right binding!
I had this issue when I was trying to inflate a custom dialog from within an activity:
<pre class="lang-java prettyprint-override"><code>AlertDialog.Builder builder = new AlertDialog.Builder(this);

final AlertBinding alertBinding = AlertBinding.inflate(LayoutInflater.from(this), null, false);

builder.setView(binding.getRoot()); // &lt;--- I was using binding (which is my Activity's binding), instead of alertBinding.
</code></pre>

I have to switch between two layouts frequently. The error is happening in the layout posted below.

When my layout is called the first time, there doesn't occur any error and everything's fine. When I then call a different layout (a blank one) and afterwards call my layout a second time, it throws the following error:

<pre><code>&gt; FATAL EXCEPTION: main
&gt; java.lang.IllegalStateException: The specified child already has a parent. You must call removeView() on the child's parent first.
</code></pre>

My layout-code looks like this:

<pre><code> tv = new TextView(getApplicationContext()); // are initialized somewhere else
 et = new EditText(getApplicationContext()); // in the code


private void ConsoleWindow(){
 runOnUiThread(new Runnable(){

 @Override
 public void run(){

 // MY LAYOUT:
 setContentView(R.layout.activity_console);
 // LINEAR LAYOUT
 LinearLayout layout=new LinearLayout(getApplicationContext());
 layout.setOrientation(LinearLayout.VERTICAL);
 setContentView(layout);

 // TEXTVIEW
 layout.addView(tv); // &lt;========== ERROR IN THIS LINE DURING 2ND RUN
 // EDITTEXT
 et.setHint("Enter Command");
 layout.addView(et);
 }
 }
}
</code></pre>

I know this question has been asked before, but it didn't help in my case.

The specified child already has a parent. You must call removeView() on the child's parent first (Android)

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我不得不频繁地在两种布局之间切换。错误发生在下面发布的布局中。当我的布局第一次被调用时，没有出现任何错误，一切正常。然后，当我调用一个不同的布局(空白布局)，然后再次调用我的布局时，它抛出以下错误：> FATAL EXCEPTION: main>     java.lang.IllegalStateException:...

问指定的子级已有父级。你必须先在孩子的父母上调用removeView() (Android)
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问指定的子级已有父级。你必须先在孩子的父母上调用removeView() (Android)
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