android : replace x bytes in the beginning of a file with y bytes

Question

I want to replace first x bytes of a file with y bytes. That is x and y are NOT same length. I tried copying to new file. Its working, but slow for large files. I know for exact length of replacement RAndomAccessfile can be used. But i am not able to use it for my purpose.

Thanks a lot for the your help.

Answer 1

If x and y aren't the same, you have no choice but to write y and then write the remainder of the file, even if all you're doing is shifting the rest of the file up by y - x bytes.