code: @TargetApi(Build.VERSION_CODES.ECLAIR)
      public static void cancel(final Context context) {
          final NotificationManager nm = (NotificationManager) context
                  .getSystemService(Context.NOTIFICATION_SERVICE);
          if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ECLAIR) {
              nm.cancel(NOTIFICATION_TAG, 0);
          } else {
              nm.cancel(NOTIFICATION_TAG.hashCode());
          }
      }
docs: Cancels any notifications of this type previously shown using
  {@link #notify(Context, String, int)}.