security - Secure my applcation used file in sdcard android -

I have used AES encryption to secure my data in sdcard. It works fine, but it takes a while to decrypt the MP3 file as a file size is big.

When I stored in another app that is stored in app-app, facebook etc. It is encrypted differently.

Is there any other option that I can apply to secure my files in Sdcard please help me

First of all, I would like to mention that you should evaluate file size and encryption / decryption time Vs. File Importance For example, we want 500 MB files available through our application through our Android, in which case we can set the necessary permissions. Because this file is not important to us, so we can not encrypt it and decide to encrypt small and important files.

That said, I will look for faster / less reliable encryption schemes which will produce faster results. After this you mentioned Facebook, you can see the open source framework developed by Facebook.