The specified child already has a parent You must call removeView on the child s parent first

Question

I create this post  because i am new at this  and i need a little help  I am doing a little exercise about a application you that put your name  and it returns  hello  the name you put    But after i push the button i get the error  The specified child already has a parent  You must call removeView   on the child s parent first   MainActivity java  package com example holaamigos   import android os Bundle  import android app Activity  import android content Intent  import android view    import android view View OnClickListener  import android widget Button  import android widget EditText   public class MainActivity extends Activity       public final static String EXTRA SALUDO    com example holaamigos SALUDO         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            final EditText txtNombre    EditText findViewById R id TxtNombre           final Button btnHola    Button findViewById R id BtnHola                btnHola setOnClickListener new OnClickListener                      Override                 public void onClick View v                        Intent intent   new Intent MainActivity this  ActivitySaludo class                       String saludo   txtNombre getText   toString                        intent putExtra EXTRA SALUDO  saludo                       startActivity intent                                   Override     public boolean onCreateOptionsMenu Menu menu               Inflate the menu  this adds items to the action bar if it is present          getMenuInflater   inflate R menu main  menu           return true             ActivitySaludo java  package com example holaamigos    import android app Activity  import android content Intent  import android os Bundle  import android widget TextView   public class ActivitySaludo extends Activity         Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity saludo            Intent intent   getIntent            String saludo   intent getStringExtra MainActivity EXTRA SALUDO              TextView txt   new TextView this             txt setText 20             txt setText saludo            TextView txtCambiado    TextView  findViewById R id TxtSaludo           txtCambiado setText saludo           setContentView txtCambiado              activity saludo xml   lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  match parent      android layout height  match parent      android orientation  vertical   gt        lt TextView          android id    id TxtSaludo          android layout width  wrap content          android layout height  wrap content          android text      gt     lt  LinearLayout gt    activity main xml     lt LinearLayout xmlns android  http   schemas android com apk res android      xmlns tools  http   schemas android com tools      android id    id LinearLayout1      android layout width  match parent      android layout height  match parent      android orientation  vertical   gt        lt TextView         android id    id LblNombre          android layout width  wrap content          android layout height  wrap content          android text   string nombre    gt        lt EditText         android id    id TxtNombre          android layout width  match parent          android layout height  wrap content          android inputType  text    gt        lt Button          android id    id BtnHola          android layout width  wrap content          android layout height  wrap content          android text   string hola apy          android onClick  enviarSaludo   gt    lt  LinearLayout gt    LogCat  10-10 16 12 18 470  D AndroidRuntime 810   Shutting down VM 10-10 16 12 18 470  W dalvikvm 810   threadid 1  thread exiting with uncaught exception  group 0x40a71930  10-10 16 12 18 586  E AndroidRuntime 810   FATAL EXCEPTION  main 10-10 16 12 18 586  E AndroidRuntime 810   java lang RuntimeException  Unable to start activity ComponentInfo com example holaamigos com example holaamigos ActivitySaludo   java lang IllegalStateException  The specified child already has a parent  You must call removeView   on the child s parent first  10-10 16 12 18 586  E AndroidRuntime 810    at android app ActivityThread performLaunchActivity ActivityThread java 2180  10-10 16 12 18 586  E AndroidRuntime 810    at android app ActivityThread handleLaunchActivity ActivityThread java 2230  10-10 16 12 18 586  E AndroidRuntime 810    at android app ActivityThread access 600 ActivityThread java 141  10-10 16 12 18 586  E AndroidRuntime 810    at android app ActivityThread H handleMessage ActivityThread java 1234  10-10 16 12 18 586  E AndroidRuntime 810    at android os Handler dispatchMessage Handler java 99  10-10 16 12 18 586  E AndroidRuntime 810    at android os Looper loop Looper java 137  10-10 16 12 18 586  E AndroidRuntime 810    at android app ActivityThread main ActivityThread java 5041  10-10 16 12 18 586  E AndroidRuntime 810    at java lang reflect Method invokeNative Native Method  10-10 16 12 18 586  E AndroidRuntime 810    at java lang reflect Method invoke Method java 511  10-10 16 12 18 586  E AndroidRuntime 810    at com android internal os ZygoteInit MethodAndArgsCaller run ZygoteInit java 793  10-10 16 12 18 586  E AndroidRuntime 810    at com android internal os ZygoteInit main ZygoteInit java 560  10-10 16 12 18 586  E AndroidRuntime 810    at dalvik system NativeStart main Native Method  10-10 16 12 18 586  E AndroidRuntime 810   Caused by  java lang IllegalStateException  The specified child already has a parent  You must call removeView   on the child s parent first  10-10 16 12 18 586  E AndroidRuntime 810    at android view ViewGroup addViewInner ViewGroup java 3339  10-10 16 12 18 586  E AndroidRuntime 810    at android view ViewGroup addView ViewGroup java 3210  10-10 16 12 18 586  E AndroidRuntime 810    at android view ViewGroup addView ViewGroup java 3186  10-10 16 12 18 586  E AndroidRuntime 810    at com android internal policy impl PhoneWindow setContentView PhoneWindow java 289  10-10 16 12 18 586  E AndroidRuntime 810    at com android internal policy impl PhoneWindow setContentView PhoneWindow java 279  10-10 16 12 18 586  E AndroidRuntime 810    at android app Activity setContentView Activity java 1901  10-10 16 12 18 586  E AndroidRuntime 810    at com example holaamigos ActivitySaludo onCreate ActivitySaludo java 25  10-10 16 12 18 586  E AndroidRuntime 810    at android app Activity performCreate Activity java 5104  10-10 16 12 18 586  E AndroidRuntime 810    at android app Instrumentation callActivityOnCreate Instrumentation java 1080  10-10 16 12 18 586  E AndroidRuntime 810    at android app ActivityThread performLaunchActivity ActivityThread java 2144  10-10 16 12 18 586  E AndroidRuntime 810        11 more 10-10 16 12 18 856  D dalvikvm 810   GC CONCURRENT freed 134K  10  free 2630K 2908K  paused 73ms 83ms  total 237ms

User · Answer

I   ve found a solution  I had to clear fragment   s parent from views before destroying and I   ve used the next peace of code for this   in Java  public void onDestroyView             if  rootView    null               ViewGroup viewGroup    ViewGroup rootView getParent                if  viewGroup    null                   viewGroup removeAllViews                                    super onDestroyView            in Kotlin  override fun onDestroyView         if  rootView    null            val viewGroup   rootView parent as ViewGroup          viewGroup  removeAllViews              super onDestroyView

User · Answer

In onCreate with activity or 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        e printStackTrace

User · Answer

In my case i just pass the wrong view to the Method

User · Answer

in ActivitySaludo  this line       setContentView txtCambiado     you must set the content view for the activity only once

User · Answer

I encountered this error while there is an invisible view in an activity xml layout  At that time it was not used in my case so I have removed it and the crash is not seen anymore

User · Answer

Try this way hope this will help you to solve your problem   TextView textView   new TextView this   textView setText  CustomTextView    addContentView textView new ViewGroup LayoutParams ViewGroup LayoutParams WRAP CONTENT  ViewGroup LayoutParams WRAP CONTENT

User · Answer

if you are adding the same view repeatedly in a for loop    if this is the case then try creating the View object of the layout inside the for loop    and add the view in side the for loop   To avoid such issues

User · Answer

You dont need this line  setContentView txtCambiado

User · Answer

In my case the problem was I was trying to add same view multiple times to linear layout   View childView   LayoutInflater from context  inflate R layout lay progressheader  parentLayout false     for  int i   1  i  lt   totalCount  i            parentLayout addView childView         just initialize view every time to fix the issue   for  int i   1  i  lt   totalCount  i            View childView   LayoutInflater from context  inflate R layout lay progressheader  parentLayout false          parentLayout addView childView

User · Answer

frameLayout addView yourView    lt ----- if you are getting error on this line remove view from it s parent first  if  yourView getParent      null     ViewGroup  yourView getParent    removeView yourView   frameLayout addView yourView    Add view to layout

User · Answer

In my case I was accidentally returning a child view from within Layout onCreateView   as shown below   public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        View view   inflater inflate R layout fragment reject  container  false        Button button   view findViewById R id some button        return button      lt -- Problem is this     The solution was to return the parent view instead of the child view

User · Answer

You just need to initialize your view in onCreate   method and then in onCreateDialog   again before setView   and it should be work

User · Answer

I encountered this error whenever I omitted a parameter while inflating the view for a fragment in the onCreateView   method like so   public View onCreateView LayoutInflater inflater  ViewGroup container  Bundle savedInstanceState        View view inflater inflate R layout fragment reject  container       return view      The solution is to change the view inflation line to   View view inflater inflate R layout fragment reject  container false    The explanation can be found at the Android guide for fragments  Quoting from the guide  the final parameter in the view initialization statement is false because        the system is already inserting the inflated layout into the container   passing true would create a redundant view group in the final layout

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

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