code: @TargetApi(Build.VERSION_CODES.KITKAT)
      public static boolean hasDeviceAdminFeature(PackageManager manager) {
          return manager.hasSystemFeature(PackageManager.FEATURE_DEVICE_ADMIN);
      }
docs: Checks if the device has a device administrative feature.
  @param manager the package manager.
  @return {@code true} if the device has a device administrative feature.