code: @Nullable
      public static long[] optLongArray(@Nullable Bundle bundle, @Nullable String key, @Nullable long[] fallback) {
          if (bundle == null) {
              return fallback;
          }
          return bundle.getLongArray(key);
      }
docs: Returns a optional long array value. In other words, returns the value mapped by key if it exists and is a long array.
  The bundle argument is allowed to be {@code null}. If the bundle is null, this method returns null.
  @param bundle a bundle. If the bundle is null, this method will return null.
  @param key a key for the value.
  @param fallback fallback value.
  @return a long array value if exists, null otherwise.
  @see android.os.Bundle#getInt(String, int)