android - Androidビデオプレーヤーにシークバーを追加する

Question

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.webkit.URLUtil;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.SeekBar;
import android.widget.Toast;
import android.widget.VideoView;

public class VideoViewDemo extends Activity implements OnClickListener, OnTouchListener {
    private static final String TAG = "VideoViewDemo";

    private VideoView mVideoView;
    private EditText mPath;
    private ImageButton mPlay;
    private ImageButton mPause;
    private ImageButton mReset;
    private ImageButton mStop;
    private String current;

    private int lengthOfAudio;
    private SeekBar seekBar;
    private final Handler handler = new Handler();
    private final Runnable r = new Runnable() {@
        Override
        public void run() {
            updateSeekProgress();
        }
    };


    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.main);
        mVideoView = (VideoView) findViewById(R.id.surface_view);

        mPath = (EditText) findViewById(R.id.path);
        mPath.setText("http://daily3gp.com/vids/747.3gp");

        mPlay = (ImageButton) findViewById(R.id.play);
        mPause = (ImageButton) findViewById(R.id.pause);
        mReset = (ImageButton) findViewById(R.id.reset);
        mStop = (ImageButton) findViewById(R.id.stop);

        seekBar = (SeekBar) findViewById(R.id.seekBar);
        seekBar.setOnTouchListener(this);

        mPlay.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                playVideo();
            }
        });
        mPause.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                if (mVideoView != null) {
                    mVideoView.pause();
                }
            }
        });
        mReset.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                if (mVideoView != null) {
                    mVideoView.seekTo(0);
                }
            }
        });
        mStop.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                if (mVideoView != null) {
                    current = null;
                    mVideoView.stopPlayback();
                }
            }
        });

        runOnUiThread(new Runnable() {
            public void run() {
                playVideo();
                updateSeekProgress();
            }
        });
    }
    public void onClick(View view) {
        updateSeekProgress();
    }


    public boolean onTouch(View v, MotionEvent event) {
        if (mVideoView.isPlaying()) {
            SeekBar tmpSeekBar = (SeekBar) v;
            mVideoView.seekTo((lengthOfAudio / 100) * tmpSeekBar.getProgress());
        }
        return false;
    }

    private void playVideo() {
        try {
            final String path = mPath.getText().toString();
            Log.v(TAG, "path: " + path);
            if (path == null || path.length() == 0) {
                Toast.makeText(VideoViewDemo.this, "File URL/path is empty",
                    Toast.LENGTH_LONG).show();

            } else {
                // If the path has not changed, just start the media player
                if (path.equals(current) && mVideoView != null) {
                    mVideoView.start();
                    //mVideoView.requestFocus();
                    return;
                }
                current = path;
                mVideoView.setVideoPath(getDataSource(path));

                lengthOfAudio = 180000;
                mVideoView.start();
                //mVideoView.requestFocus();

            }
        } catch (Exception e) {
            Log.e(TAG, "error: " + e.getMessage(), e);
            if (mVideoView != null) {
                mVideoView.stopPlayback();
            }
        }
    }


    private void updateSeekProgress() {
        if (mVideoView.isPlaying()) {
            seekBar.setProgress((int)(((float) mVideoView.getCurrentPosition() / lengthOfAudio) * 100));
            handler.postDelayed(r, 1000);
        }
    }

    private String getDataSource(String path) throws IOException {
        if (!URLUtil.isNetworkUrl(path)) {
            return path;
        } else {
            URL url = new URL(path);
            URLConnection cn = url.openConnection();
            cn.connect();
            InputStream stream = cn.getInputStream();
            if (stream == null)
                throw new RuntimeException("stream is null");
            File temp = File.createTempFile("mediaplayertmp", "dat");
            temp.deleteOnExit();
            String tempPath = temp.getAbsolutePath();
            FileOutputStream out = new FileOutputStream(temp);
            byte buf[] = new byte[128];
            do {
                int numread = stream.read(buf);
                if (numread <= 0)
                    break;
                out.write(buf, 0, numread);
            } while (true);
            try {
                stream.close();
            } catch (IOException ex) {
                Log.e(TAG, "error: " + ex.getMessage(), ex);
            }
            return tempPath;
        }
    }
}

http://davanum.wordpress.com/2009/12/04/android-%E2%80%93-videomusic-player-sample-take-2/からサンプル チュートリアルを取得し、 それをさらに拡張してシーク バーを実装しました。コードを追加しましたが、ビデオの進行に合わせてシーク バーが移動しません。私は何か間違ったことをしていますか？私はアンドロイドプログラミングが初めてです。