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

Question

I have looked through a lot of content online but none of the suggestions work. I have a listview that sometimes work and sometimes crashes my app with the following:

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. Make sure your adapter calls notifyDataSetChanged() when its content changes.

I am definitely calling the notifyDataSetChanged() (In the onPostExecute() of an async task). I have tried as suggested by examples online to run it on the main thread like below:

getActivity().runOnUiThread(new Runnable() {
                public void run() {
                    CAdapterFilter.notifyDataSetChanged();
                }
            });

but that did not work either. Still my app will crash at random times. Can anyone shed some light here? Why is it only crashing randomly and not every time. What am I missing?

do you add items to your adapter on UI or background thread? — Stefan Golubović, Mar 12 '18 at 10:16
notifyDataSetChanged() will only get notified when your data is gets changed using add(),delete(),update() methods. — Jaydip Kalkani, Mar 12 '18 at 10:16
shall we guess the error ? is your `logcat error` **Irritating ListView exception** ? — Santanu Sur, Mar 12 '18 at 10:17
I have a custom adapter where the items are being added in the doInBackground process? Is this the issue? Should it be added onPostExecute? — Christopher Smit, Mar 12 '18 at 10:17
@Santanu - You obviously didn't read my question because I am quoting the error. — Christopher Smit, Mar 12 '18 at 10:18
[@Christopher Smit](https://stackoverflow.com/users/3948544/christopher-smit) [could be](https://stackoverflow.com/questions/3132021/android-listview-illegalstateexception-the-content-of-the-adapter-has-changed) — Stefan Golubović, Mar 12 '18 at 10:19
got it..now post your `doInBackground` method we will fix it !! — Santanu Sur, Mar 12 '18 at 10:21
Post your logcat here and what is CAdapterFilter ??? is it class or object ? — Pragnesh Ghoda シ, Mar 12 '18 at 10:24

score 1 · Accepted Answer · answered Mar 12 '18 at 10:28

1

Try this :-

doInBackground(....) {
 mPseudoList.addAll(fetched_list);
 return xyz;
}

onPostExecute(...) {
 mAdapterList.addAll(mPseudoList);
 mAdapter.notifyDataSetChanged();
}

Change the adapter list reference in onPostExecute(...) and then notify the adapter !!

Note :-

In doInBackground dont update the list whose reference the adapter holds , instead use a pseudo-list and update the adapter reference list in onPostExecute

answered Mar 12 '18 at 10:28

Santanu Sur

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1

This is basically the approach I went with and it works so will accept the answer. Thanks. – Christopher Smit Mar 12 '18 at 10:43

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

1 Answers1