Question

As many others, I am getting IllegalStateException when using a ListView 🙁

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

I know the basic explanation – I am probably trying to modify the list from background thread. After exploring my code over and over again, I cant find a place that I am actually doing that. I am not adding \ removing elements from the list – it is static, and does not change from creation.
What I AM doing is only modifying the internal data of the list’s elements from a worker thread – but I am not sure if it is actually my problem.
so – this is my question – is it allowed to modify the underneath data of the list elements from background thread as long as I do not modify the list itself by adding \ removing elements?

Update:
Well I guess you are right, so here is a pseudo code:

//from main GUI thread.
ArrayList<People> namesList = // create and populate the list...
//lets assume that NamesArrayAdapter extends ArrayAdapter<People>
NamesArrayAdapter adapter = new NamesArrayAdapter(context, listViewResource, namesList); //instantiate the list adapter


//from backgroung thread
namesList.getItem(0).setName("et"); //Modifying existing element inside the list - is this ligal???

Answer 1

I AM doing is only modifying the internal data of the list's elements from a worker thread

Is it the same static list as you set in Adapter?

Then you can not change them from Background Thread. If you change them then make sure you call notifyDataSetChanged.