我写了一个Android应用程序（在Eclipse），可播放的音乐文件，如下所示：

I have written an Android application ( in eclipse) that plays a music file as follows:

MediaPlayer mediaPlayer = new MediaPlayer();
        try
        {

            mediaPlayer.setDataSource(fileName);
            mediaPlayer.prepare();
            mediaPlayer.start();
        //  mediaPlayer.stop();

        }
        catch (Exception e)
        {
            Log.d("Exception---", e.getMessage());
        }

当我运行它，它不播放该文件（并没有显示任何异常），但是当我切换到调试模式，并逐行跟踪它，它播放的文件。我真的很困惑。请您帮我看看有什么不对？

When I run it, it does not play the file ( and does not show any exception ), but when I switch to 'debug mode', and trace it line by line, it plays the file. I'm really confused. Would you please help me find out what's wrong?

感谢。

推荐答案

把前一个日志mediaPlayer.setDataSource（文件名）和检查，如果你得到一个有效的文件名在释放模式。

Put a log before "mediaPlayer.setDataSource(fileName)" and check if you are getting a valid fileName in release mode.