Android Question unicode (\u) to string

is there any simple and fast way to convert large amount of unicode text into a string?
like, "\u3069\u3046\u3082\u3042\u308a\u304c\u3068\u3046" into "どうもありがとう".
i already tried this function:
https://www.b4x.com/android/forum/t...results-i-cant-read-hebrew.27461/#post-159533
it works but it is very slow.

thanks