Android : Record sound in mp3 format

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There’s a work around for saving .mp3 files using MediaRecorder. Here’s how:

recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
recorder.setOutputFile(Environment.getExternalStorageDirectory()
        .getAbsolutePath() + "/myrecording.mp3");
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
recorder.prepare();
recorder.start();

The important part here is the setOuputFormat and the setAudioEncoder. Apparently MediaRecorder records playable mp3 if you’re using MediaRecorder.OutputFormat.MPEG_4 and MediaRecorder.AudioEncoder.AAC together. Hope this helps somebody.

Of course, if you’d rather use the AudioRecorder class I think the source code Chirag linked below should work just fine – https://github.com/yhirano/Mp3VoiceRecorderSampleForAndroid (although you might need to translate some of it from Japanese to English)

Edit: As Bruno, and a few others pointed out in the comments, this does not encode the file in MP3. The encoding is still AAC. However, if you try to play a sound, saved using a .mp3 extension via the code above, it will still play without issues because most media players are smart enough to detect the real encoding.

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