public static void cancel(){
  if (fetchExe != null) {
    fetchExe.shutdownNow();
    fetchExe=null;
  }
  BitmapAjaxCallback.clearTasks();
}

public static void cancel ( ) { if ( fetchExe != null ) { fetchExe . shutdownNow ( ) ; fetchExe = null ; } BitmapAjaxCallback . clearTasks ( ) ; }
cancel all ajax tasks . warning : do not call this method unless you are exiting an application .
