I have a very simple task, which I can't seem to do... The application runs a background thread to process some files. As it goes, I thought it'd be nice to just show the progress as it happens.
My first thought was to have a Thread, and call append() on a TextView from the activity as each file was processed. That didn't work because of this error: CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views. Ok, so I saw this tutorial, but I can't make it work: http://android-developers.blogspot.com/2009/05/painless-threading.html It looks like I should be able to do this: private class updater extends AsyncTask { public TextView tv = null; protected Object doInBackground(Object[] args) { this.publishProgress("hello..."); return((Object) this); } protected void onProgressUpdate(Object[] msgs) { if (msgs != null) { String msg = msgs[0].toString(); trace(msg); } } private void trace(String msg) { if (tv != null) tv.append(msg + "\n"); } } } As it says in the tutorial: * You can specify the type, using generics, of the parameters, the progress values and the final value of the task * The method doInBackground() executes automatically on a worker thread * onPreExecute(), onPostExecute() and onProgressUpdate() are all invoked on the UI thread * The value returned by doInBackground() is sent to onPostExecute () * You can call publishProgress() at anytime in doInBackground() to execute onProgressUpdate() on the UI thread * You can cancel the task at any time, from any thread So that should work... I guess. Problem: Calling publishProgress() steps into a series of binary-only files, and never invokes onProgressUpdate(). Help? Anyone got a working example of onProgressUpdate()? ~ Doug. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
