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我正在编写一个可以从 Http 播放的小型播放器。媒体播放器可以使用mPlayer.setDataSource(url) 从 http 流播放 mp3；，但我想保存这个文件。我试过以下：

public static void downloadFile(File f, String songUrl, IDownloadListener listener)throws Exception{
    URL url = new URL(songUrl);
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.setConnectTimeout(5000);
    connection.setRequestMethod("GET");
    connection.setDoInput(true);
    InputStream inStream = connection.getInputStream();
    FileOutputStream outStream = new FileOutputStream(f);

    Integer fileLength = connection.getContentLength();
    try {
        byte data[] = new byte[16384];

        int lastPercentNotify = -1, curPercent;
        int count;
        int total = 0;

        listener.onFileDescriptorAvailable(outStream.getFD());   //!!!! this willnotify about FD

        while ((count = inStream.read(data, 0, data.length)) != -1){
            total += count;
            outStream.write(data, 0, count);
            curPercent = (total * 100) / fileLength;

            if (curPercent != lastPercentNotify && listener != null && curPercent % 10 == 0){
                listener.onDownload(f.getName(), curPercent, 100);
                lastPercentNotify = curPercent;
            }
        }
    }finally {
        inStream.close();
        outStream.close();
    }
}

在我的听众中，我做了以下事情：

 mPlayer.setDataSource(fileDescr);
//prepare and call mPlayer.start()

但是当我尝试更改获取描述符时的点时，我有各种例外情况。

UPD：我的代码可以很好地保存文件。我在播放 mp3 和同时保存到 SD 卡时遇到了麻烦。

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