Android decode/encode audio file

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http://stackoverflow.com – I have a problem about decode, cut and encode mp3 file. I research it about one month. I am using jlayer library for decode and cut and can play AudioTrack but I don't find have can encode it mp3 or may be ogg. I read a lot of post about decode/encode libraries. Everyone recommend a library, I don't find a good docs or examples. Can you give some informations? (HowTos)