Mix sound files on android

I was trying to make a program that开发者_如何学JAVA would take a recording from the microphone, and overlay it on an existing wav file. How would this be possible?

If you don't have to save the file as one file and just want to play it together, you can simply create 2 MediaPlayers and play them at the same time. If you want to actually create a new file, you would need to read about WAV file structure and go from there.