android AudioTrack不能播放awr(6)

            btnStop.setEnabled(true);        

        } 

    } 

    class PlayTask extends AsyncTask<Void, Integer, Void>{ 

        @Override 

        protected Void doInBackground(Void... arg0) { 

            isPlaying = true; 

            int bufferSize = AudioTrack.getMinBufferSize(frequence, channelConfig, audioEncoding); 

            short[] buffer = new short[bufferSize/4]; 

            //byte[] buffer = new byte[bufferSize]; 

            try { 

                //定义输入流，将音频写入到AudioTrack类中，实现播放

                DataInputStream dis = new DataInputStream(new BufferedInputStream(new FileInputStream(audioFile))); 

                //FileInputStream fis = new FileInputStream(audioFile); 

                //实例AudioTrack 

                AudioTrack track = new AudioTrack(AudioManager.STREAM_MUSIC, frequence, channelConfig, audioEncoding, bufferSize, AudioTrack.MODE_STREAM); 

                //开始播放

                track.play(); 

                //由于AudioTrack播放的是流，所以，我们需要一边播放一边读取

                while(isPlaying && dis.available()>0){ 

                    int i = 0; 

                    while(dis.available()>0 && i<buffer.length){ 

                        buffer[i] = dis.readShort();