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.

W

Answer 1

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.