how to solve FATAL EXCEPTION: Timer-11 in android?

here is the 开发者_如何学Ccode for exception::

if (getZoomLevel() != last_zoom)
 {
 // if computeScroll called before timer counts down we should drop it and start it over again
   zoom_event_delay_timer.cancel();
   zoom_event_delay_timer = new Timer();
   Log.v("last_zoom","last_zoom");
  zoom_event_delay_timer.schedule(new TimerTask()
  {
   @Override
  public void run()
  {
      zoom_change_listener.onZoomChange(_this, getZoomLevel(), last_zoom);
       Log.v("last_zoom","last_zoom"+last_zoom);
       last_zoom = getZoomLevel();
       Log.v("last_zoom","last_zoom");
   }
  }, events_timeout);
}

and the Error:

01-05 12:24:50.791: ERROR/AndroidRuntime(11132): FATAL EXCEPTION: Timer-11
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132): java.util.ConcurrentModificationException
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at java.util.ArrayList$ArrayListIterator.next(ArrayList.java:573)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at com.bluepal.android.parkable.Prakablescreen.onRegionChange(Prakablescreen.java:1028)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at com.bluepal.android.parkable.Prakablescreen$14.onPanChange(Prakablescreen.java:467)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at com.bluepal.android.parkable.EnhancedMapView$2.run(EnhancedMapView.java:126)
    01-05 12:24:50.791: ERROR/AndroidRuntime(11132):     at java.util.Timer$TimerImpl.run(Timer.java:289)

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the problem here seems to be that you are calling the UI thread from another thread (in this case the timer). I found these sites for explanation and solving the problem (i used a handler).

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Please supply some source code .

From the error it seems that you are trying to modify an arraylist while iterating over it.If that is the case , use a temporary container for the arraylist & after all modifications, store this temporary arraylist to your arraylist .

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From the error it seems that you are trying to modify an arraylist while iterating over it

If 100rabh is right and you're not modifying your list though an iterator, maybe you can use a CopyOnWriteArrayList, which is ThreadSafe.