Android播放外部MP3：错误 - MediaPlayer开始呼叫状态1

Question

我在播放Android上的外部MP3文件时遇到问题。我使用下面的代码：

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就是外部文件是字符串。我确实有SD卡的写入权限（WRITE_EXTERNAL_STORAGE）。

在调试，我看到：

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

什么可能的问题是什么？

Answer 1

找到答案：在致电player.start()之前，您必须根据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(); 

Answer 2

您需要设置权限AndroidManifest.xml为：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>