Android AES-128 encryption/decryption of file is very slow. How can I increase the speed

Question

I am developing an android app that secures images and videos like Vaulty and Keep safe. I am trying to use AES-128 encryption/decryption technique to store images and videos. I

Answer 1

Use a larger buffer as suggested by @MikeLaren, and also wrap the FileOutputStream in a BufferedOutputStream. When decrypting, wrap the FileInputStream in a BufferedInputStream. Or do both in both cases: no harm done.

No need for heroic buffer sizes like a megabyte: 8k or 32k is sufficient.