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参考：
   
   
   
建议下载一个铃声文件（小点的），然后用千千静听，转换成wav格式的。
   
源码如下：
   
public class Playmp3Activity extends Activity  {     private final String file="//sdcard//testring.wav";    private final static String tag="22";    static byte[] buffer=null;    AudioTrack at=null;    int pcmlen=0;        @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        try {            FileInputStream fis=new FileInputStream(file);            buffer=new byte[1024*1024*2];            int len=fis.read(buffer);            Log.i(tag, "fis len="+len);            Log.i(tag, "0:"+(char)buffer[0]);            pcmlen=0;            pcmlen+=buffer[0x2b];            pcmlen=pcmlen*256+buffer[0x2a];            pcmlen=pcmlen*256+buffer[0x29];            pcmlen=pcmlen*256+buffer[0x28];                        int channel=buffer[0x17];            channel=channel*256+buffer[0x16];                        int bits=buffer[0x23];            bits=bits*256+buffer[0x22];                        Log.i(tag, "pcmlen="+pcmlen+",channel="+channel+",bits="+bits);            at = new AudioTrack(AudioManager.STREAM_MUSIC, 44100,                 channel, AudioFormat.ENCODING_PCM_16BIT, pcmlen, AudioTrack.MODE_STATIC);            at.write(buffer, 0x2C, pcmlen);            Log.i(tag, "write 1...");            at.play();            Log.i(tag, "play 1...");        } catch (Exception e) {            e.printStackTrace();        }    }        @Override    protected void onDestroy() {        super.onDestroy();        at.release();    }}

@Override

protected void onCreate(Bundle savedInstanceState)

@Override

protected void onDestroy()

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