java.lang.RuntimeException: An error occured while executing doInBackground()

Question

Sometimes i get this crash error in my app

java.lang.RuntimeException: An error occured while executing doInBackground()

This is the full l

Answer 1

You're showing a Toast in loadFeed which is called in the doInBackground part of your AsyncTask. You shouldn't access the UI from there.

Answer 2

I think In this code Toast make problem for you,

catch (Throwable t){
              Log.e("OSFP.News",t.getMessage(),t);

                Toast.makeText(nea.this, "Χρειάζεστε σύνδεση στο internet",
                        Toast.LENGTH_SHORT).show();
                finish();

            }

Because you are trying to do UI operation from worker thread of AsyncTask this will never allowed..

UPDATE: If you want to update something from the doInBackGround() of AsyncTask use publishProgress(Progress...) and onProgressUpdate(Progress...).

Answer 3

This is probably because you're trying to display something on doInBackground(). doInBackground runs in a worker thread which cannot do any UI work (including showing Toasts, which is what you're doing). Instead, all UI work should be done on onPostExecute().

Answer 4

You can't do any GUI work on a background thread. Instead you should post a Runnable to a handler created in the GUI thread to make your Toast execute on the correct thread.

EDIT: Since the homework tag was removed, I'll give an outline how to do it;

• new() up a Handler in your GUI thread (onCreate is a good place) and save it in a member variable, say "handler".
• Move showing your Toast to a Runnable (anonymous class is pretty good for this)
• To show the toast, do a handler.post() with your Runnable as a parameter. The Runnable will execute in the GUI thread.

For a complete example, see this article.