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 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{
       List Itens;

       @Override
       protected void onPreExecute() {

        //your code

        list.setVisibility(View.GONE);
        adapterItem= new MyListAdapter(MyActivity.this, R.layout.item, new ArrayList());
        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);
    }

}

}