我在Android上播放外部MP3文件时遇到问题.我正在使用以下代码：

MediaPlayer player = new MediaPlayer();
try {
    BufferedInputStream bis = new BufferedInputStream(new java.net.URL(url).openStream());
    FileOutputStream fos = new FileOutputStream(Environment.getExternalStorageDirectory().getPath() + "/forvo_temp.mp3");
    BufferedOutputStream bos = new BufferedOutputStream(fos,1024);
    byte [] data = new byte[1024];

    int x=0;
    while((x=bis.read(data,0,1024))>=0){
        bos.write(data,0,x);               
    }
    player.reset();
    player.start();

} catch (Exception e) {
    e.printStackTrace();
}

url是外部文件所在的字符串.我确实具有SD卡的写入权限(WRITE_EXTERNAL_STORAGE).

在调试中,我看到：

E MediaPlayer start called in state 1
E MediaPlayer error (-38, 0)
E MediaPlayer Error (-38,0)

可能是什么问题？

解决方法:

找到了答案：在调用player.start()之前,必须根据State Diagram of the MediaPlayer reference运行setDataSource()和prepare().

像这样：

// Use same path as before
player.setDataSource(Environment.getExternalStorageDirectory().getPath() + "/forvo_temp.mp3");
player.prepare();