Call removeView on the child s parent first

Question

First a little background   I have a layout inside a scrollview  At first  when the user scrolls on the screen  the scrollview scrolls  However  after a certain amount of scroll  I was to disable the scroll on the scroll view the move the  scroll focus  onto a webview inside the child layout  This way  the scrollview sticks and all the scroll events go to the webview inside it   So  for a solution  when the scroll threshold is reached  I remove the child layout from the scrollview and put it in scrollview s parent  And make the scrollview invisible       Remove the child view from the scroll view scrollView removeView scrollChildLayout       Get scroll view out of the way scrollView setVisibility View GONE       Put the child view into scrollview s parent view parentLayout addView scrollChildLayout     General Idea   -  means contains   Before  parentlayout -  scrollview -  scrollChildLayout  After   parentLayout -  scrollChildLayout  The above code is giving me this exception   java lang IllegalStateException  The specified child already has a parent  You must call removeView   on the child s parent first             at android view ViewGroup addViewInner ViewGroup java 1976             at android view ViewGroup addView ViewGroup java 1871             at android view ViewGroup addView ViewGroup java 1828             at android view ViewGroup addView ViewGroup java 1808    Do you know what s going on  I am clearly calling removeView on the parent

User · Answer

I was calling parentView removeView childView  and childView was still showing   I eventually realized that a method was somehow being triggered twice and added the childView to the parentView twice   So  use parentView getChildCount   to determine how many children the parent has before you add a view and afterwards   If the child is added too many times then the top most child is being removed and the copy childView remains-which looks like removeView is working even when it is   Also  you shouldn t use View GONE to remove a view   If it s truly removed then you won t need to hide it  otherwise it s still there and you re just hiding it from yourself

User · Answer

Here is my solution   Lets say you have two TextViews and put them on a LinearLayout  named ll   You ll put this LinerLayout on another LinerLayout    lt  lm Linear Layout gt           lt  ll Linear Layout gt                 lt name Text view gt                lt  name Text view gt                lt surname Text view gt                lt  surname Text view gt          lt  ll Linear Layout gt    lt  lm Linear Layout gt     When you want to create this structure you need to give parent as inheritance    If you want use it in an onCreate method this will enough   Otherwise here is solition   LinerLayout lm   new LinearLayout this      You can use getApplicationContext   also LinerLayout ll   new LinearLayout lm getContext     TextView name   new TextView ll getContext     TextView surname   new TextView ll getContext

User · Answer

Kotlin Solution  Kotlin simplifies parent casting with as   returning null if left side is null or cast fails    childView parent as  ViewGroup   removeView childView    Kotlin Extension Solution  If you want to simplify this even further  you can add this extension   childView removeSelf    fun View  removeSelf         this    return     val parentView   parent as  ViewGroup    return     parentView removeView this      It will safely do nothing if this View is null  parent view is null  or parent view is not a ViewGroup     NOTE  If you also want safe removal of child views by parent  add this    fun ViewGroup removeViewSafe toRemove  View        if  contains toRemove   removeView toRemove

User · Answer

What I was doing wrong so I got this error is I wasn t instantiating dynamic layout and adding childs to it so got this error

User · Answer

In onCreate with activity or in onCreateView with fragment    if  view    null        ViewGroup parent    ViewGroup  view getParent        if  parent    null            parent removeView view           try       view   inflater inflate R layout fragment main  container  false     catch  InflateException e

User · Answer

Solution     ViewGroup scrollChildLayout getParent    removeView scrollChildLayout     scrollView removeView scrollChildLayout     Use the child element to get a reference to the parent  Cast the parent to a ViewGroup so that you get access to the removeView method and use that   Thanks to  Dongshengcn for the solution

User · Answer

Try remove scrollChildLayout from its parent view first   scrollview removeView scrollChildLayout    Or remove all the child from the parent view  and add them again   scrollview removeAllViews

User · Answer

Ok  call me paranoid but I suggest     final android view ViewParent parent   view getParent        if  parent instanceof android view ViewManager           final android view ViewManager viewManager    android view ViewManager  parent        viewManager removeView  view          if   casting without instanceof just seems wrong  And  thanks IntelliJ IDEA for telling me   removeView is part of the ViewManager interface  And one should not cast to a concrete class when a perfectly suitable interface is available

User · Answer

You can also do it by checking if View s  indexOfView method  if indexOfView method returns -1 then we can use   ViewGroup s detachViewFromParent v   followed by  ViewGroup s removeDetachedView v  true false

User · Answer

In my case   I have BaseFragment and all other fragment inherits from this   So my solytion was add this lines in OnDestroyView   method   Override public final View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        if  mRootView    null                mRootView    inflater    null   getActivity   getLayoutInflater     inflater  inflate mContentViewResourceId  container  false                      Override public void onDestroyView         if  mRootView    null                ViewGroup parentViewGroup    ViewGroup  mRootView getParent             if  parentViewGroup    null                        parentViewGroup removeAllViews                         super onDestroyView

User · Answer

All you have to do is post   a Runnable that does the addView

[android] Call removeView() on the child's parent first

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