从URI里面的音频播放Listview,但Seekbar在Android Listview项目中没有更新

问题：音频正在播放列表视图,但仍然Seekbar没有移动(更新).

编辑：1

1.Audio正在播放每个Listview项目完全,但Seekbar不工作(不更新).

请帮我解决这个问题.

我的Listview数组适配器类：

Adapter.class

private static final int UPDATE_FREQUENCY = 500;

 int progress=0;

        public View getView(final int position,View view,ViewGroup parent) {
            LayoutInflater inflater = context.getLayoutInflater();
            View rowView = inflater.inflate(R.layout.audio_listview,null,true);


            ListenAUdioButton = (Button) rowView.findViewById(R.id.ListenAudiobuttonxml);
            seek_bar_view = (SeekBar) rowView.findViewById(R.id.seek_bar);
            ListenAUdioButton.setonClickListener(new View.OnClickListener() {
                public void onClick(View v) {
                    // text_shown.setText("Playing...");
                    try {


                        try {
                            // get Internet status
                            isInternetPresent = cd1.isConnectingToInternet();
                            // check for Internet status
                            if (isInternetPresent) {
                                if (!itemname3_AUdio_FILE[position].equals("") || !itemname3_AUdio_FILE[position].equals("null")) {
                                    System.out.println(" AUdio FILE :-)" + itemname3_AUdio_FILE[position]);

                                    player = new MediaPlayer();
                                    player.setAudioStreamType(AudioManager.STREAM_MUSIC);

                                    player.setDataSource(context,Uri.parse(itemname3_AUdio_FILE[position]));
                                    player.prepareAsync();


                                    player.setonPreparedListener(new MediaPlayer.OnPreparedListener() {
                                        @Override
                                        public void onPrepared(MediaPlayer mp) {
                                            try {

                                                mp.start();

                                                seek_bar_view.setMax(player.getDuration());
                                                updatePosition();


                                            } catch (Exception e) {
                                                e.printstacktrace();
                                            }
                                        }
                                    });


                                    player.setonCompletionListener(new MediaPlayer.OnCompletionListener() {
                                        @Override
                                        public void onCompletion(MediaPlayer mp) {
                                            stopPlay();
                                        }
                                    });


                                    MediaPlayer.OnErrorListener onError = new MediaPlayer.OnErrorListener() {

                                        @Override
                                        public boolean onError(MediaPlayer mp,int what,int extra) {
                                            // returning false will call the OnCompletionListener
                                            return false;
                                        }
                                    };


                                } else {
                                    Toast.makeText(getContext(),"Audio Not Found..!",Toast.LENGTH_SHORT).show();
                                }

                            } else {

                                Toast.makeText(getContext(),"Please Check Your Internet Connection..!",Toast.LENGTH_SHORT).show();

                            }

                        } catch (Exception e) {
                            e.printstacktrace();

                            Toast.makeText(getContext(),Toast.LENGTH_SHORT).show();

                        }

                    } catch (Exception e) {
                        e.printstacktrace();
                    }
                }
            });
            return rowView;
        }

        private void stopPlay() {
            player.stop();
            player.reset();
            // playButton.setimageResource(android.R.drawable.ic_media_play);
            handler.removeCallbacks(updatePositionRunnable);
            seek_bar_view.setProgress(0);

            // isstarted = false;
        }


        private final Handler handler = new Handler();

        private final Runnable updatePositionRunnable = new Runnable() {
            public void run() {
                updatePosition();
            }
        };



private void updatePosition()
    {
        handler.removeCallbacks(updatePositionRunnable);

        seek_bar_view.setProgress(progress);
progress=getProgresspercentage(player.getCurrentPosition(),player.getDuration();
        notifyDataSetChanged();

       handler.postDelayed(updatePositionRunnable,UPDATE_FREQUENCY);

    }