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POAndroid, ListView IllegalStateException: "The content of the adapter has changed but ListView did not receive a notification"
 

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  1. POAndroid, ListView IllegalStateException: "The content of the adapter has changed but ListView did not receive a notification"
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    <p><strong>What I want to do</strong>: run a background thread which calculates ListView contents and update ListView partially, while results are calculated.</p> <p><strong>What I know I have to avoid</strong>: 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.</p> <p><strong>Research of other people</strong>: there is very valuable data <a href="http://permalink.gmane.org/gmane.comp.handhelds.android.devel/82685" rel="noreferrer">here</a>. I also suffered from almost daily crashes for group of ~500 users, and when I added <code>list.setVisibility(GONE)/trackList.setVisibility(VISIBLE)</code> block in onProgressUpdate, crashes lowered by a factor of 10 but not disappeared. (it was suggested in <a href="http://www.mailinglistarchive.com/html/android-developers@googlegroups.com/2010-04/msg01174.html" rel="noreferrer">answer</a> )</p> <p><strong>What I got sometimes</strong>: 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:</p> <pre><code>`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) [...] </code></pre> <p><strong>Help?</strong> Not needed anymore, see below</p> <p><strong>FINAL ANSWER:</strong> As it turned out, I was calling <code>notifyDataSetChanged</code> 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.</p>
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    1. USSandip Armal Patil
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      1. USGeraldo Nascimento
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    1. CODid you call notifyDataSetChanged()?
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      1. USDenis Palnitsky
    2. COOf course, in onProgressUpdate there goes sequence: list.setVisibility(GONE) - addObjectToList/synchronized operation on list/ - notifyDataSetChanged() - list.setVisibility(VISIBLE) (and without visibility modifications exception happens far more often)
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    3. COAre you modifying the underlying ArrayList on a different thread? All changes, even to the ArrayList that is referenced by the Adapter, have to occur on the UI thread.
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