获取音频文件的持续时间 [英] get duration of audio file

问题描述

我制作了一个录音机应用，我想在列表视图中显示录音的持续时间.我这样保存录音:

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();
    }

如何获取此文件的持续时间(以秒为单位)?

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

预先感谢

-编辑 我成功了，我在MediaPlayer.setOnPreparedListener()方法内调用了MediaPlayer.getduration()，所以它返回了0.

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

推荐答案

MediaMetadataRetriever是一种轻便高效的方法. MediaPlayer太重，可能会在滚动，分页，列出等高性能环境中出现性能问题.

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.

此外，Error (100,0)可能会在MediaPlayer上发生，因为它很繁重，有时需要一次又一次地重新启动.

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);

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