android - シークバーアンドロイドの特定の位置からオーディオストリーミングを開始する方法

Question

私はこれでオーディオストリーミングAndroidアプリケーションに取り組んでいます。再生を開始すると、このオーディオストリーミングアプリケーションを使用して再生しているサーバーから曲のURLを取得し、バッファリングも表示されますが、シークバーを特定の位置に移動すると問題が発生しますバッファリングされていないシークバー ハンドルが後方に移動しています。実際には、その位置から曲の再生を開始する必要があります。私のコードを見て、このシナリオの処理方法を教えてください

public class StreamingMp3Player extends Activity implements OnClickListener, OnTouchListener, OnCompletionListener, OnBufferingUpdateListener{

    private ImageButton buttonPlayPause;
    private SeekBar seekBarProgress;
    public EditText editTextSongURL;

    private MediaPlayer mediaPlayer;
    private int mediaFileLengthInMilliseconds; // this value contains the song duration in milliseconds. Look at getDuration() method in MediaPlayer class

    private final Handler handler = new Handler();

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        initView();
    }

    /** This method initialise all the views in project*/
    private void initView() {
        buttonPlayPause = (ImageButton)findViewById(R.id.ButtonTestPlayPause);
        buttonPlayPause.setOnClickListener(this);

        seekBarProgress = (SeekBar)findViewById(R.id.SeekBarTestPlay);  
        seekBarProgress.setMax(99); // It means 100% .0-99
        seekBarProgress.setOnTouchListener(this);
        editTextSongURL = (EditText)findViewById(R.id.EditTextSongURL);
        editTextSongURL.setText("http://instilltech.netii.net/01LECHIPODAMA.mp3");

        mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnBufferingUpdateListener(this);
        mediaPlayer.setOnCompletionListener(this);
    }



    /** Method which updates the SeekBar primary progress by current song playing position*/
    private void primarySeekBarProgressUpdater() {
        seekBarProgress.setProgress((int)(((float)mediaPlayer.getCurrentPosition()/mediaFileLengthInMilliseconds)*100)); // This math construction give a percentage of "was playing"/"song length"
        if (mediaPlayer.isPlaying()) {
            Runnable notification = new Runnable() {
                public void run() {
                    primarySeekBarProgressUpdater();
                }
            };
            handler.postDelayed(notification,1000);
        }
    }

    @Override
    public void onClick(View v) {
        if(v.getId() == R.id.ButtonTestPlayPause){
             /** ImageButton onClick event handler. Method which start/pause mediaplayer playing */
            try {
                mediaPlayer.setDataSource(editTextSongURL.getText().toString()); // setup song from http://www.hrupin.com/wp-content/uploads/mp3/testsong_20_sec.mp3 URL to mediaplayer data source
                mediaPlayer.prepare(); // you must call this method after setup the datasource in setDataSource method. After calling prepare() the instance of MediaPlayer starts load data from URL to internal buffer. 
            } catch (Exception e) {
                e.printStackTrace();
            }

            mediaFileLengthInMilliseconds = mediaPlayer.getDuration(); // gets the song length in milliseconds from URL

            if(!mediaPlayer.isPlaying()){
                mediaPlayer.start();
                buttonPlayPause.setImageResource(R.drawable.button_pause);
            }else {
                mediaPlayer.pause();
                buttonPlayPause.setImageResource(R.drawable.button_play);
            }

            primarySeekBarProgressUpdater();
        }
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if(v.getId() == R.id.SeekBarTestPlay){
            /** Seekbar onTouch event handler. Method which seeks MediaPlayer to seekBar primary progress position*/
            if(mediaPlayer.isPlaying()){
                SeekBar sb = (SeekBar)v;
                int playPositionInMillisecconds = (mediaFileLengthInMilliseconds / 100) * sb.getProgress();
                mediaPlayer.seekTo(playPositionInMillisecconds);
            }
        }
        return false;
    }

    @Override
    public void onCompletion(MediaPlayer mp) {
         /** MediaPlayer onCompletion event handler. Method which calls then song playing is complete*/
        buttonPlayPause.setImageResource(R.drawable.button_play);
    }

    @Override
    public void onBufferingUpdate(MediaPlayer mp, int percent) {
        /** Method which updates the SeekBar secondary progress by current song loading from URL position*/
        seekBarProgress.setSecondaryProgress(percent);
    }
}