android AudioTrack不能播放awr(7)

                        i++; 

                    } 

                    //然后将数据写入到AudioTrack中

                    track.write(buffer, 0, buffer.length); 

                } 

                //播放结束

                track.stop(); 

                dis.close(); 

            } catch (Exception e) { 

                // TODO: handle exception 

            } 

            return null; 

        } 

        protected void onPostExecute(Void result){ 

            btnPlay.setEnabled(true); 

            btnFinish.setEnabled(false); 

            btnStart.setEnabled(true); 

            btnStop.setEnabled(false); 

        } 

        protected void onPreExecute(){   

            //stateView.setText("正在播放"); 

            btnStart.setEnabled(false); 

            btnStop.setEnabled(false); 

            btnPlay.setEnabled(false);