KeyEvent.ACTION_UP fired TWICE for ACTION_MEDIA_BUTTON

I have this broadcast receiver for ACTION_MEDIA_BUTTON which actually works for both Android 2.x and Android 4.1, but for some strange reason, on Android 2.x (only), I get each even twice (for a single click on the pause button, of course):

public class RemoteControlReceiver extends BroadcastReceiver {
  private static long prevEventTime = 0;

  @Override
  public void onReceive(Context ctx, Intent intent) {
    if (Intent.ACTION_MEDIA_BUTTON.equals(intent.getAction())) {
      KeyEvent event = (KeyEvent)intent.getParcelableExtra(Intent.EXTRA_KEY_EVENT);
      long curEventTime = event.getEventTime();
      if (event != null && (event.getAction() == KeyEvent.ACTION_UP) /*&& (curEventTime != prevEventTime)*/) {
        int keycode = event.getKeyCode();
        switch (keycode)
        {
          case KeyEvent.KEYCODE_MEDIA_NEXT:
            Log.i(TAG, "KEYCODE_MEDIA_NEXT"); 
            break;
          case KeyEvent.KEYCODE_HEADSETHOOK:
            Log.i(TAG, "KEYCODE_HEADSETHOOK" + " " +  curEventTime + " <> " + prevEventTime + " (" + event.getAction() + ")");
            prevEventTime = curEventTime;
            break;
          case KeyEvent.KEYCODE_MEDIA_PREVIOUS:
            Log.i(TAG, "KEYCODE_MEDIA_PREVIOUS"); 
            break;
          default:
        }
      }     
    }
  }

}

Attempting to understand the mystery, I log the event time for each such occurrence:

03-01 18:27:05.264: I/RemoteControlReceiver.onReceive(22377): KEYCODE_HEADSETHOOK 142304436 <> 0 (1)
03-01 18:27:05.434: I/RemoteControlReceiver.onReceive(22377): KEYCODE_HEADSETHOOK 142304436 <> 142304436 (1)

03-01 18:27:14.054: I/RemoteControlReceiver.onReceive(22377): KEYCODE_HEADSETHOOK 142313265 <> 142304436 (1)
03-01 18:27:14.074: I/RemoteControlReceiver.onReceive(22377): KEYCODE_HEADSETHOOK 142313265 <> 142313265 (1)

03-01 18:27:24.254: I/