android - get duration of audio file

Question

I have made a voice recorder app, and I want to show the duration of the recordings in a listview. I save the recordings like this:

MediaRecorder recorder = new MediaRecorder();
recorder.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);
folder = new File(Environment.getExternalStorageDirectory()
            + File.separator + "Audio recordings");
String[] files = folder.list();
    int number = files.length + 1;
    String filename = "AudioSample" + number + ".mp3";
    File output = new File(Environment.getExternalStorageDirectory()
            + File.separator + "Audio recordings" + File.separator
            + filename);
    FileOutputStream writer = new FileOutputStream(output);
    FileDescriptor fd = writer.getFD();
    recorder.setOutputFile(fd);
    try {
        recorder.prepare();
        recorder.start();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        Log.e(LOG_TAG, "prepare() failed");
        e.printStackTrace();
    }

How can I get the duration in seconds of this file?

Thanks in advance

---EDIT I got it working, I called MediaPlayer.getduration() inside the MediaPlayer.setOnPreparedListener() method so it returned 0.

Answer 1

MediaMetadataRetriever is a lightweight and efficient way to do this. MediaPlayer is too heavy and could arise performance issue in high performance environment like scrolling, paging, listing, etc.

Furthermore, Error (100,0) could happen on MediaPlayer since it's a heavy and sometimes restart needs to be done again and again.

Uri uri = Uri.parse(pathStr);
MediaMetadataRetriever mmr = new MediaMetadataRetriever();
mmr.setDataSource(AppContext.getAppContext(),uri);
String durationStr = mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_DURATION);
int millSecond = Integer.parseInt(durationStr);