Changing a specific byte in a file

Question

I am trying to write a java function that will change 1 byte in a large file. How can I read and write a specific address in a file from java on Android? I tried fis.read (byte b [], int off, int len) and every time I get power.

Answer 1

Use RandomAccessFile .

Kickoff example:

 RandomAccessFile raf = new RandomAccessFile(file, "rw"); try { raf.seek(5); // Go to byte at offset position 5. raf.write(70); // Write byte 70 (overwrites original byte at this offset). } finally { raf.close(); // Flush/save changes and close resource. }