Android ListView IllegalStateException The content of the adapter has changed but ListView did not receive a notification

Question

What I want to do  run a background thread which calculates ListView contents and update ListView partially  while results are calculated   What I know I have to avoid  I cannot mess with ListAdapter contents from background thread  so I inherited AsyncTask and publish result  add entries to adapter  from onProgressUpdate  My Adapter uses ArrayList of result objects  all operations on those arraylists are synchronized   Research of other people  there is very valuable data here  I also suffered from almost daily crashes for group of  500 users  and when I added list setVisibility GONE  trackList setVisibility VISIBLE  block in onProgressUpdate  crashes lowered by a factor of 10 but not disappeared   it was suggested in answer    What I got sometimes  please notice  it happens really rarely  once a week for one of 3 5k users   But I d like to get rid of this bug completely  Here is partial stacktrace    java lang IllegalStateException   The content of the adapter has changed but ListView  did not receive a notification  Make sure the content of your adapter is not modified from a background thread  but only from the UI thread   in ListView 2131296334  class android widget ListView  with Adapter class com transportoid Tracks TrackListAdapter   at android widget ListView layoutChildren ListView java 1432  at android widget AbsListView onTouchEvent AbsListView java 2062  at android widget ListView onTouchEvent ListView java 3234  at android view View dispatchTouchEvent View java 3709  at android view ViewGroup dispatchTouchEvent ViewGroup java 852  at android view ViewGroup dispatchTouchEvent ViewGroup java 884  at android view ViewGroup dispatchTouchEvent ViewGroup java 884  at android view ViewGroup dispatchTouchEvent ViewGroup java 884          Help  Not needed anymore  see below  FINAL ANSWER  As it turned out  I was calling notifyDataSetChanged every 5 insertions to avoid flickering and sudden list changes  It cannot be done such way  always notify adapter when base list changes  This bug it long gone for me now

User · Answer

I m was facing the same problem with exactly the same error log  In my case onProgress   of the AsyncTask adds the values to the adapter using mAdapter add newEntry   To avoid the UI becoming less responsive I set mAdapter setNotifyOnChange false  and call mAdapter notifyDataSetChanged   4 times the second  Once per second the array is sorted   This work well and looks very addictive  but unfortunately it is possible to crash it by touching the shown list items often enough   But it seems I have found an acceptable workaround  My guess it that even if you just work on the ui thread the adapter does not accept many changes to it s data without calling notifyDataSetChanged    because of this I created a queue that is storing all the new items until the mentioned 300ms are over  If this moment is reached I add all the stored items in one shot and call notifyDataSetChanged    Until now I was not able to crash the list anymore

User · Answer

I had the same problem and I solved it  My problem was that I was using a listview  with an array adapter and with filter  On the method performFiltering I was messing with the array that have the data and it was the problem since this method is not running on the UI thread and EVENTUALLY it raises some problems

User · Answer

Please try one of these solutions     Sometimes  if you add new object to data list in a thread  or doInBackground method   this error will occur  The solution is   create a temporary list and do adding data to this list in thread or doInBackground   then do copying all data from temporary list to the list of adapter in UI thread  or onPostExcute  Make sure all UI updates are called in UI thread

User · Answer

i had the same problem  finally i got the solution  before updating listview  if the soft keypad is present close it first  after that set data source and call notifydatasetchanged     while closing keypad internally listview will update its ui  it keep calling till closing keypad  that time if data source change it willl throw this exception  if data is updating in onActivityResult  there is a chance for same error    InputMethodManager imm    InputMethodManager  activity getSystemService Context INPUT METHOD SERVICE               imm hideSoftInputFromWindow v getWindowToken    0            view postDelayed new Runnable                  Override             public void run                     refreshList                            100L

User · Answer

Several days ago I met the same problem and causes several thousands of crash per day  about 0 1  of users meet this situation  I tried setVisibility GONE VISIBLE  and requestLayout    but crash count only decreases a little    And I finally solved it  Nothing with setVisibility GONE VISIBLE   Nothing with requestLayout     Finally I found the reason is I used a Handler to call notifyDataSetChanged   after update data  which may lead to a sort of     Updates data to a model object I call it a DataSource  User touches listview which may call checkForTap   onTouchEvent   and finally calls layoutChildren     Adapter gets data from model object and call notifyDataSetChanged   and update views   And I made another mistake that in getCount    getItem   and getView    I directly use fields in DataSource  rather than copy them to the adapter  So finally it crashes when    Adapter updates data which last response gives When next response back  DataSource updates data  which causes item count change User touches listview  which may be a tap or a move or flip getCount   and getView   is called  and listview finds data is not consistent  and throws exceptions like java lang IllegalStateException  The content of the adapter has changed but     Another common exception is an IndexOutOfBoundException if you use header footer in ListView    So solution is easy  I just copy data to adapter from my DataSource when my Handler triggers adapter to get data and calls notifyDataSetChanged    The crash now never happens again

User · Answer

I had the same problem  but I fixed it using the method  requestLayout      from the class ListView

User · Answer

I wrote this code and had it run in a 2 1 emulator image for  12 hours and did not get the IllegalStateException  I m going to give the android framework the benefit of the doubt on this one and say that it is most likely an error in your code  I hope this helps  Maybe you can adapt it to your list and data   public class ListViewStressTest extends ListActivity       ArrayAdapter lt String gt  adapter      ListView list      AsyncTask lt Void  String  Void gt  task        Override     public void onCreate Bundle savedInstanceState            super onCreate savedInstanceState            this adapter   new ArrayAdapter lt String gt  this  android R layout simple list item 1           this list   this getListView             this list setAdapter this adapter            this task   new AsyncTask lt Void  String  Void gt                  Random r   new Random                int   delete              volatile boolean scroll   false                Override             protected void onProgressUpdate String    values                    if scroll                        scroll   false                      doScroll                        return                                     if values    null                        doDelete                        return                                     doUpdate values                    if ListViewStressTest this adapter getCount    gt  5000                        ListViewStressTest this adapter clear                                                 private void doScroll                     if ListViewStressTest this adapter getCount      0                        return                                     int n   r nextInt ListViewStressTest this adapter getCount                     ListViewStressTest this list setSelection n                              private void doDelete                     int   d                  synchronized this                        d   this delete                                    if d    null                        return                                    for int i   0   i  lt  d length   i                          int index   d i                       if index  gt   0  amp  amp  index  lt  ListViewStressTest this adapter getCount                              ListViewStressTest this adapter remove ListViewStressTest this adapter getItem index                                                                       private void doUpdate String    values                    for int i   0   i  lt  values length   i                          ListViewStressTest this adapter add values i                                                 private void updateList                     int number   r nextInt 30    1                  String   strings   new String number                    for int i   0   i  lt  number   i                          strings i    Long toString r nextLong                                        this publishProgress strings                              private void deleteFromList                     int number   r nextInt 20    1                  int   toDelete   new int number                    for int i   0   i  lt  number   i                          int num   ListViewStressTest this adapter getCount                        if num  lt  2                            break                                            toDelete i    r nextInt num                                      synchronized this                        this delete   toDelete                                     this publishProgress null                              private void scrollSomewhere                     this scroll   true                  this publishProgress null                               Override             protected Void doInBackground Void    params                    while true                        int what   r nextInt 3                        switch what                            case 0                              updateList                                break                          case 1                              deleteFromList                                break                          case 2                              scrollSomewhere                                break                                             try                           Thread sleep 0                         catch InterruptedException e                               TODO Auto-generated catch block                         e printStackTrace                                                                               this task execute null

User · Answer

I was also getting exact same error and using AsyncTask     java lang IllegalStateException   The content of the adapter has changed but ListView  did not receive a notification  Make sure the content of your adapter is not modified from a background thread  but only from the UI thread   in ListView 2131296334  class android widget ListView  with Adapter    etc   I solved it by puttingadapter notifyDataSetChanged    at the bottom of my UI thread  that is my AsyncTask onPostExecute method  Like this     protected void onPostExecute Void aVoid      all my other stuff etc        all my other stuff etc                adapter notifyDataSetChanged                                                    Now my app works   EDIT   In fact  my app still crashed about every 1 in 10 times  giving the same error   Eventually I came across runOnUiThread on a previous post  which I thought could be useful  So I put it in my doInBackground method  like this     Override protected Void doInBackground Void    voids         runOnUiThread new Runnable                           public void run     etc    etc      And I removed the  adapter notifyDataSetChanged    method  Now  my app never crashes

User · Answer

This is a known bug in Android  4 to 4 4 KitKat  and is resolved in    4 4    See here    https   code google com p android issues detail id 71936

User · Answer

This is a MultiThreading Issue and Using Properly Synchronized Blocks This can be prevented  Without putting extra things on UI Thread and causing loss of responsiveness of app   I also faced the same  And as the most accepted answer suggests making change to adapter data from UI Thread can solve the issue  That will work but is a quick and easy solution but not the best one    As you can see for a normal case  Updating data adapter from background thread and calling notifyDataSetChanged in UI thread works   This illegalStateException arises when a ui thread is updating the view and another background thread changes the data again  That moment causes this issue   So if you will synchronize all the code which is changing the adapter data and making notifydatasetchange call  This issue should be gone  As gone for me and i am still updating the data from background thread   Here is my case specific code for others to refer   My loader on the main screen loads the phone book contacts into my data sources in the background        Override     public Void loadInBackground             Log v TAG   Init loadings contacts            synchronized  SingleTonProvider getInstance                  PhoneBookManager preparePhoneBookContacts getContext                       This PhoneBookManager getPhoneBookContacts reads contact from phonebook and fills them in the hashmaps  Which is directly usable for List Adapters to draw list   There is a button on my screen  That opens a activity where these phone numbers are listed  If i directly setAdapter over the list before the previous thread finishes its work which is fast naviagtion case happens less often  It pops up the exception  Which is title of this SO question  So i have to do something like this in the second activity   My loader in the second activity waits for first thread to complete  Till it shows a progress bar  Check the loadInBackground of both the loaders   Then it creates the adapter and deliver it to the activity where on ui thread i call setAdapter   That solved my issue   This code is a snippet only  You need to change it to compile well for you    Override public Loader lt PhoneBookContactAdapter gt  onCreateLoader int arg0  Bundle arg1        return new PhoneBookContactLoader this       Override public void onLoadFinished Loader lt PhoneBookContactAdapter gt  arg0  PhoneBookContactAdapter arg1        contactList setAdapter adapter   arg1            AsyncLoader to load phonebook and notify the list once done      private static class PhoneBookContactLoader extends AsyncTaskLoader lt PhoneBookContactAdapter gt         private PhoneBookContactAdapter adapter       public PhoneBookContactLoader Context context            super context               Override     public PhoneBookContactAdapter loadInBackground             synchronized  SingleTonProvider getInstance                  return adapter   new PhoneBookContactAdapter getContext                              Hope this helps

User · Answer

I had the same issue   I was adding items to my ArrayList outside the UI thread   Solution  I have done both  adding the items and called notifyDataSetChanged   in the UI thread

User · Answer

I had the same sittuation   I had many buttongroup insite my item on listview and I was changing some boolean values inside my item like holder rbVar setOnclik     my problem occured because I was calling a method inside getView    and was saving an object inside sharepreference  so I had same error above  How I solved it  I removed my method inside getView   to notifyDataSetInvalidated   and problem gone      Override     public void notifyDataSetChanged             saveCurrentTalebeOnShare currentTalebe           super notifyDataSetChanged

User · Answer

Had this happen intermittently  turns out I only had this issue when the list was scrolled after a  load more  last item was clicked  If the list wasn t scrolled  everything worked fine   After MUCH debugging  it was a bug on my part  but an inconsistency in the Android code also   When the validation happens  this code is executed in ListView            else if  mItemCount    mAdapter getCount                  throw new IllegalStateException  The content of the adapter has changed but                          ListView did not receive a notification  Make sure the content of     But when onChange happens it fires this code in AdapterView  parent of ListView        Override     public void onChanged             mDataChanged   true          mOldItemCount   mItemCount          mItemCount   getAdapter   getCount      Notice the way the Adapter is NOT guaranteed to be the Same   In my case  since it was a  LoadMoreAdapter  I was returning the WrappedAdapter in the getAdapter call  for access to the underlying objects   This resulted in the counts being different due to the extra  Load More  item and the Exception being thrown   I only did this because the docs make it seem like it s ok to do  ListView getAdapter javadoc     Returns the adapter currently in use in this ListView  The returned   adapter might not be the same adapter passed to   setAdapter ListAdapter  but might be a WrapperListAdapter

User · Answer

adapter notifyDataSetChanged

User · Answer

My solution   1  create a temp ArrayList   2  do your heavy works  sqlite row fetch        in doInBackground method and add items to the temp arraylist   3  add all items from temp araylist to your listview s arraylist in onPostExecute method   note  you may want to delete some items from listview and also delete from sqlite database and maybe delete some files related to items from sdcard   just remove items from database and remove their related files and add them to temp arraylist in background thread  then in UI thread delete items existing in temp arraylist from the listview s arraylist   Hope this helps

User · Answer

I solved this by have 2 Lists   One list I use for only the adapter  and I do all data changes updates on the other list   This allows me to do updates on one list in a background thread  and then update the  adapter  list in the main UI thread   List lt  gt  data   new ArrayList lt  gt     List lt  gt  adapterData   new ArrayList         adapter   new Adapter adapterData   listView setAdapter adapter       Whenever data needs to be updated  it can be done in a separate thread void updateDataAsync         new Thread new Runnable                  Override         public void run                            Make updates the  data  list                                  Update your adapter              refreshList                     start       void refreshList         runOnUiThread new Runnable                  Override         public void run                         adapterData clear                adapterData addAll data               adapter notifyDataSetChanged                listView invalidateViews

User · Answer

I had a custom ListAdapter and was calling super notifyDataSetChanged   at the beginning and not the end of the method   Override public void notifyDataSetChanged         recalculate        super notifyDataSetChanged

User · Answer

One cause for this crash is that ArrayList object cannot change completely  So  when I remove an item  I have to do this   mList clear    mList addAll newDataList     This fixed the crash for me

User · Answer

My issue was related to the use of a Filter together with the ListView   When setting or updating the underlying data model of the ListView  I was doing something like this   public void updateUnderlyingContacts List lt Contact gt  newContacts  String filter        this allContacts   newContacts      this filteredContacts   newContacts      getFilter   filter filter       Calling filter   in the last line will  and must  cause notifyDataSetChanged   to be called in the Filter s publishResults   method  This may work okay sometimes  specially in my fast Nexus 5  But in reality  it s hiding a bug that you will notice with slower devices or in resource intensive conditions   The problem is that the filtering is done asynchronously  and thus between the end of the filter   statement and the call to publishResults    both in the UI thread  some other UI thread code may execute and change the content of the adapter   The actual fix is easy  just call notifyDataSetChanged   also before requesting the filtering to be performed   public void updateUnderlyingContacts List lt Contact gt  newContacts  String filter        this allContacts   newContacts      this filteredContacts   newContacts      notifyDataSetChanged       Fix     getFilter   filter filter

User · Answer

I have a List if Feed objects  It s appended and truncated from none-UI thread  It works fine with adapter below  I call FeedAdapter notifyDataSetChanged in UI thread anyway but little bit later  I do like this because my Feed objects stay in memory in Local Service even when UI is dead   public class FeedAdapter extends BaseAdapter       private int size   0      private final List lt Feed gt  objects       public FeedAdapter Activity context  List lt Feed gt  objects            this context   context          this objects   objects          size   objects size               public View getView int position  View convertView  ViewGroup parent                            Override     public void notifyDataSetChanged             size   objects size             super notifyDataSetChanged                Override     public int getCount             return size              Override     public Object getItem int position            try               return objects get position             catch  Error e                return Feed emptyFeed                        Override     public long getItemId int position            return position

User · Answer

Like  Mullins said   I both added the items and called notifyDataSetChanged   in the UI thread and I resolved this       Mullins    In my case I have asynctask and I called notifyDataSetChanged   in the doInBackground   method and the problem is solved  when I called from onPostExecute   I received the exception

User · Answer

I faced a similar problem  here s how I solved in my case  I verify if the task already is RUNNING or FINISHED because an task can run only once  Below you will see a partial and adapted code from my solution   public class MyActivity          private MyTask task        Override     protected void onCreate Bundle savedInstanceState              your code        task   new MyTask           setList               private void setList         if  task    null          if  task getStatus   equals AsyncTask Status RUNNING                task cancel true               task   new MyTask                task execute                       else if  task getStatus   equals AsyncTask Status FINISHED                 task   new MyTask                task execute              else              task execute               class MyTask extends AsyncTask lt Void  Item  Void gt          List lt Item gt  Itens           Override        protected void onPreExecute                your code          list setVisibility View GONE           adapterItem  new MyListAdapter MyActivity this  R layout item  new ArrayList lt Item gt              list setAdapter adapterItem            adapterItem notifyDataSetChanged                Override     protected Void doInBackground Void    params             Itens   getItens            for  Item item   Itens                publishProgress item                       return null              Override     protected void onProgressUpdate Item     item                        adapterItem add item 0                Override     protected void onPostExecute Void result              your code         adapterItem notifyDataSetChanged                 list setVisibility View VISIBLE

User · Answer

In my case I called the method GetFilter   on an adapter from the TextWatcher   method on main Activity  and I added the data with a For loop on GetFilter    The solution was change the For loop to AfterTextChanged   sub method on main Activity and delete the call to GetFilter

User · Answer

Even I faced the same problem in my XMPP notification application  receivers message needs to be added back to list view  implemented with ArrayList   When I tried to add the receiver content through MessageListener  separate thread   application quits with above error  I solved this by adding the content to my arraylist  amp  setListviewadapater through runOnUiThread method which is part of Activity class  This solved my problem

User · Answer

i haved same problem when add new data in lazy image loader  i just put            adapter notifyDataSetChanged      in          protected void onPostExecute Void args            adapter notifyDataSetChanged               Close the progressdialog         mProgressDialog dismiss                 hope it helps you

[android] Android, ListView IllegalStateException: "The content of the adapter has changed but ListView did not receive a notification"

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