/**
   * uninstall the Third lock app
   *
   * @param packageName the package name of lock
   * @return the result of delete app
   */
  private static int unInstallSilence(String packageName, Context context) {
    if (TextUtils.isEmpty(packageName)) {
      return 0;
    }
    PackageManager pm = context.getPackageManager();

    PackageDeleteObserver pdo = new PackageDeleteObserver();
    ACA.PackageManager.deletePackage(pm, packageName, pdo, 0);
    synchronized (pdo) {
      while (!pdo.finished) {
        try {
          pdo.wait();
        } catch (InterruptedException e) {
          e.printStackTrace();
        }
      }
      return pdo.result;
      //            if (pdo.result == ACA.PackageManager.DELETE_SUCCEEDED) {
      //                return 1;
      //            }
    }
  }