[android-developers] Indeterminate Progress Bar not animating

I have an indeterminate ProgressBar in an XML layout for a fragment. When I display this fragment the first time, the ProgressBar visibility is set to VISIBLE, and the activity circle spins until a loading operation is complete, at which time the ProgressBar visibility is set to INVISIBLE, and it disappears. All good so far.

However, when conditions occur that causing the loading operation to happen again, the ProgressBar visibility is set to VISIBLE, but it does not animate (spin), it stays static. I can reinitiate that loading operation as many times as I want, and reset the ProgressBar visibility ad naseum, but it never spins again.

First, the code is being invoked already on the UI thread, so it should work (it is actually downstream from the onReceive callback of a BroadcastReceiver, which at least with the references I've been able to dig up, is supposed to happen on the UI thread). However, just to be safe, I tried two other means of putting the changing of ProgressBar visibility on the UI thread, via:

1. Explicitly running on the UI thread:

getActivity().runOnUiThread(new Runnable()
{
@Override
public void run()
{
progressBar.setVisibility(View.VISIBLE);
}
});

2. Using an AsyncTask, where onPostExecute() is guaranteed to be on the UI thread.:

public static class ProgressBarTask extends AsyncTask<Void, Void, Bitmap>
{
private ImageLoader loader;

@Override
protected Bitmap doInBackground(Void... params)
{
return true
}

@Override
protected void onPostExecute(Bitmap result)
{
ImportantWrappingClass.this.progressBar.setVisibility(View.VISIBLE);
}
}

In addition to this, I also tried resetting the ProgressBar's progress to 0 (even though it was indeterminate). None of the above had any effect, the ProgressBar still doesn't spin the second (or third, or n time it is displayed).

So my question -- how can I get an indeterminate ProgressBar to spin when hidden/displayed again after the first time?

Your answers are appreciated.

Thanks,

Brad

--
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+unsubscribe@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/android-developers?hl=en
---
You received this message because you are subscribed to the Google Groups "Android Developers" group.
To unsubscribe from this group and stop receiving emails from it, send an email to android-developers+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.