دانلود آهنگ از سرور و پخش در موزیک پلیر (( استاد کمک کن ))

درود
استاد تورو خدا کمکم کنید ..
چند ماهه که من سر این دانلود موندم 
من چطوری باید آهنگ رو از سرور دانلود کنم؟؟
توو مرور گر آدرس لینک رو که میدم دانلود میشه اما توو اندروید دانلود نمیشه ...
 سوال بعدی این که و قتی دانلود شد چوری باید با  موزیک پلیر پخش شه ....
ی قسمت ی دکمه ی Download_music قرار دادم . با زدن این دکمه آهنگ باید دانلود شه .. کمکم کنید

 public class ActivityMusicDetail extends EnhancedActivity implements OnCompletionListener, SeekBar.OnSeekBarChangeListener {

    private MediaPlayer mediaPlayer;

    private int         seekForwardTime  = 3000;
    private int         seekBackwardTime = 3000;

    private double      timeElapsed      = 0;

    private SeekBar     songProgressBar;
    private Button      btnPlay;
    private Button      btnForward;
    private Button      btnBackward;

    private TextView    songCurrentDurationLabel;
    private TextView    songTotalDurationLabel;

    private Utilities   utils;
    public static int   oneTimeOnly      = 0;

    private int         currentSongIndex = 0;

    private TextView    music_name;
    private TextView    singer_name;
    private Button      btnBack;
    private Button      Download_music;
    private ImageView   imgLogo;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_music_detail);

        music_name = (TextView) findViewById(R.id.music_name);
        singer_name = (TextView) findViewById(R.id.singer_name);
        btnBack = (Button) findViewById(R.id.btnBack);
        Download_music = (Button) findViewById(R.id.Download_music);

        imgLogo = (ImageView) findViewById(R.id.imgLogo);

        btnPlay = (Button) findViewById(R.id.btnPlay);
        btnForward = (Button) findViewById(R.id.btnForward);
        btnBackward = (Button) findViewById(R.id.btnBackward);
        songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
        songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
        songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);
        mediaPlayer = new MediaPlayer();
        mediaPlayer = MediaPlayer.create(this, R.raw.sample_song);
        utils = new Utilities();

        songProgressBar.setClickable(false);
        songProgressBar.setOnSeekBarChangeListener(this);
        mediaPlayer.setOnCompletionListener(this);

        songProgressBar.setProgress(oneTimeOnly);

        music_name.setText(G.selectedApplication.music_name);
        singer_name.setText(G.selectedApplication.singer_name);

        Download_music.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                String musicname = HelperString.getFileName(G.selectedApplication.music_downloadUrl);
                DownloadRequest downloadRequest = new DownloadRequest()
                        .downloadPath("http://169.254.72.1/Folkolor/" + G.selectedApplication.music_downloadUrl)
                        .filepath(G.DIR_MUSIC + "/" + musicname)
                        .listener(new OnDownloadCompleteListener() {

                            @Override
                            public void onDownloadComplete(String url, String localPath) {

                            }
                        })
                        .download();

            }
        });

        String filename = HelperString.getFileName(G.selectedApplication.logoUrl);
        final File imageFile = new File(G.DIR_FINAL + "/" + filename);
        if ( !imageFile.exists()) {
            imgLogo.setImageBitmap(null);
            DownloadManager.addToDownloadList(G.selectedApplication.logoUrl, imgLogo);
        }

        BitmapFactory.Options options = new BitmapFactory.Options();
        //options.inSampleSize = 8;
        Bitmap bitmap = BitmapFactory.decodeFile(imageFile.getAbsolutePath(), options);
        imgLogo.setImageBitmap(bitmap);

        btnBack.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View arg0) {
                Intent intent = new Intent(G.currentActivity, ActivityMusicsList.class);
                G.currentActivity.startActivity(intent);
                G.currentActivity.finish();

            }
        });

        btnPlay.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // check for already playing
                if (mediaPlayer.isPlaying()) {
                    if (mediaPlayer != null) {
                        mediaPlayer.pause();
                        // Changing button image to play button
                        btnPlay.setBackgroundResource(R.drawable.play);
                    }
                } else {
                    // Resume song
                    if (mediaPlayer != null) {
                        mediaPlayer.start();
                        timeElapsed = mediaPlayer.getCurrentPosition();
                        songProgressBar.setProgress((int) timeElapsed);
                        G.HANDLER.postDelayed(mUpdateTimeTask, 100);
                        btnPlay.setBackgroundResource(R.drawable.pause);
                    }
                }

            }
        });

        btnForward.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // get current song position                
                int currentPosition = mediaPlayer.getCurrentPosition();
                // check if seekForward time is lesser than song duration
                if (currentPosition + seekForwardTime <= mediaPlayer.getDuration()) {
                    // forward song
                    mediaPlayer.seekTo(currentPosition + seekForwardTime);
                } else {
                    // forward to end position
                    mediaPlayer.seekTo(mediaPlayer.getDuration());
                }
            }
        });

        /**
         * Backward button click event
         * Backward song to specified seconds
         * */
        btnBackward.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // get current song position                
                int currentPosition = mediaPlayer.getCurrentPosition();
                // check if seekBackward time is greater than 0 sec
                if (currentPosition - seekBackwardTime >= 0) {
                    // forward song
                    mediaPlayer.seekTo(currentPosition - seekBackwardTime);
                } else {
                    // backward to starting position
                    mediaPlayer.seekTo(0);
                }

            }
        });
    }


    public void playSong(int songIndex) {
        // Play song
        try {
            mediaPlayer.reset();
            mediaPlayer.prepare();
            mediaPlayer.start();

            // Changing Button Image to pause image
            btnPlay.setBackgroundResource(R.drawable.play);

            // set Progress bar values
            songProgressBar.setProgress(0);
            songProgressBar.setMax(100);

        }
        catch (IllegalArgumentException e) {
            e.printStackTrace();
        }
        catch (IllegalStateException e) {
            e.printStackTrace();
        }
        catch (IOException e) {
            e.printStackTrace();
        }
    }


    /**
     * Update timer on seekbar
     * */
    public void updateProgressBar() {
        G.HANDLER.postDelayed(mUpdateTimeTask, 100);
    }

    /**
     * Background Runnable thread
     * */
    private Runnable mUpdateTimeTask = new Runnable() {

                                         @Override
                                         public void run() {
                                             long totalDuration = mediaPlayer.getDuration();
                                             long currentDuration = mediaPlayer.getCurrentPosition();

                                             // Displaying Total Duration time
                                             songTotalDurationLabel.setText("" + utils.milliSecondsToTimer(totalDuration));
                                             // Displaying time completed playing
                                             songCurrentDurationLabel.setText("" + utils.milliSecondsToTimer(currentDuration));

                                             // Updating progress bar
                                             int progress = (int) (utils.getProgressPercentage(currentDuration, totalDuration));
                                             //Log.d("Progress", ""+progress);
                                             songProgressBar.setProgress(progress);

                                             // Running this thread after 100 milliseconds
                                             G.HANDLER.postDelayed(this, 100);
                                         }
                                     };


    /**
 * 
 * */
    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) {

    }


    /**
     * When user starts moving the progress handler
     * */
    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {
        // remove message Handler from updating progress bar
        G.HANDLER.removeCallbacks(mUpdateTimeTask);
    }


    /**
     * When user stops moving the progress hanlder
     * */
    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {
        G.HANDLER.removeCallbacks(mUpdateTimeTask);
        int totalDuration = mediaPlayer.getDuration();
        int currentPosition = utils.progressToTimer(seekBar.getProgress(), totalDuration);

        // forward or backward to certain seconds
        mediaPlayer.seekTo(currentPosition);

        // update timer progress again
        updateProgressBar();
    }


    @Override
    public void onDestroy() {
        super.onDestroy();

        mediaPlayer.pause();
    }


    @Override
    public void onCompletion(MediaPlayer arg0) {
        btnPlay.setBackgroundResource(R.drawable.play);