code: @Nullable
      public static float[] optFloatArray(@Nullable Bundle bundle, @Nullable String key, @Nullable float[] fallback) {
          if (bundle == null) {
              return fallback;
          }
          return bundle.getFloatArray(key);
      }
docs: Returns a optional float array value. In other words, returns the value mapped by key if it exists and is a float 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 float array value if exists, null otherwise.
  @see android.os.Bundle#getFloatArray(String)