btnPlay = (ImageButton) findViewById(R.id.btnPlay);
    btnForward = (ImageButton) findViewById(R.id.btnForward);
    btnBackward = (ImageButton) findViewById(R.id.btnBackward);
    btnPlaylist = (ImageButton) findViewById(R.id.btnPlaylist);
    btnRepeat = (ImageButton) findViewById(R.id.btnRepeat);
    btnShuffle = (ImageButton) findViewById(R.id.btnShuffle);
    songProgressBar = (SeekBar) findViewById(R.id.songProgressBar);
    songTitleLabel = (TextView) findViewById(R.id.songTitle);
    songCurrentDurationLabel = (TextView) findViewById(R.id.songCurrentDurationLabel);
    songTotalDurationLabel = (TextView) findViewById(R.id.songTotalDurationLabel);

    // Mediaplayer
    mp = new MediaPlayer();
    songManager = new SongsManager();
    utils = new Utilities();

    // Listeners
    songProgressBar.setOnSeekBarChangeListener(this); // Important
    mp.setOnCompletionListener(this); // Important

    // Getting all songs list
    songsList = songManager.getPlayList();

    // By default play first song
    playSong(0);

    /**
     * Play button click event plays a song and changes button to pause
     * image pauses a song and changes button to play image
     * */
    btnPlay.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // check for already playing
            if (mp.isPlaying()) {
                if (mp != null) {
                    mp.pause();
                    // Changing button image to play button
                    btnPlay.setImageResource(R.drawable.btn_play);
                }
            } else {
                // Resume song
                if (mp != null) {
                    mp.start();
                    // Changing button image to pause button
                    btnPlay.setImageResource(R.drawable.btn_pause);
                }
            }

        }
    });

    btnForward.setOnLongClickListener(new OnLongClickListener() {

        @Override
        public boolean onLongClick(View v) {
            // get current song position
            int currentPosition = mp.getCurrentPosition();
            // check if seekForward time is lesser than song duration
            if (currentPosition + seekForwardTime <= mp.getDuration()) {
                // forward song
                mp.seekTo(currentPosition + seekForwardTime);
            } else {
                // forward to end position
                mp.seekTo(mp.getDuration());
            }
            return false;
        }
    });

    /**
     * Forward button click event Forwards song specified seconds
     * */
    btnForward.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // get current song position
            // check if next song is there or not
            if (currentSongIndex < (songsList.size() - 1)) {
                playSong(currentSongIndex + 1);
                currentSongIndex = currentSongIndex + 1;
            } else {
                // play first song
                playSong(0);
                currentSongIndex = 0;
            }
        }
    });

    btnBackward.setOnLongClickListener(new OnLongClickListener() {

        @Override
        public boolean onLongClick(View v) {
            int currentPosition = mp.getCurrentPosition();
            // check if seekBackward time is greater than 0 sec
            if (currentPosition - seekBackwardTime >= 0) {
                // forward song
                mp.seekTo(currentPosition - seekBackwardTime);
            } else {
                // backward to starting position
                mp.seekTo(0);
            }
            return false;
        }
    });

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

        @Override
        public void onClick(View arg0) {
            if (currentSongIndex > 0) {
                playSong(currentSongIndex - 1);
                currentSongIndex = currentSongIndex - 1;
            } else {
                // play last song
                playSong(songsList.size() - 1);
                currentSongIndex = songsList.size() - 1;
            }

        }
    });

    /**
     * Button Click event for Repeat button Enables repeat flag to true
     * */
    btnRepeat.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            if (isRepeat) {
                isRepeat = false;
                Toast.makeText(getApplicationContext(), "Repeat is OFF",
                        Toast.LENGTH_SHORT).show();
                btnRepeat.setImageResource(R.drawable.btn_repeat);
            } else {
                // make repeat to true
                isRepeat = true;
                Toast.makeText(getApplicationContext(), "Repeat is ON",
                        Toast.LENGTH_SHORT).show();
                // make shuffle to false
                isShuffle = false;
                btnRepeat.setImageResource(R.drawable.btn_repeat_focused);
                btnShuffle.setImageResource(R.drawable.btn_shuffle);
            }
        }
    });

    /**
     * Button Click event for Shuffle button Enables shuffle flag to true
     * */
    btnShuffle.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            if (isShuffle) {
                isShuffle = false;
                Toast.makeText(getApplicationContext(), "Shuffle is OFF",
                        Toast.LENGTH_SHORT).show();
                btnShuffle.setImageResource(R.drawable.btn_shuffle);
            } else {
                // make repeat to true
                isShuffle = true;
                Toast.makeText(getApplicationContext(), "Shuffle is ON",
                        Toast.LENGTH_SHORT).show();
                // make shuffle to false
                isRepeat = false;
                btnShuffle.setImageResource(R.drawable.btn_shuffle_focused);
                btnRepeat.setImageResource(R.drawable.btn_repeat);
            }
        }
    });

    /**
     * Button Click event for Play list click event Launches list activity
     * which displays list of songs
     * */
    btnPlaylist.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View arg0) {
            Intent i = new Intent(getApplicationContext(),
                    PlayListActivity.class);
            startActivityForResult(i, 100);
        }
    });

}

/**
 * Receiving song index from playlist view and play the song
 * */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (resultCode == 100) {
        currentSongIndex = data.getExtras().getInt("songIndex");
        // play selected song
        playSong(currentSongIndex);
    }

}

/**
 * Function to play a song
 *
 * @param songIndex
 *            - index of song
 * */
public void playSong(int songIndex) {
    // Play song
    try {
        mp.reset();
        mp.setDataSource(songsList.get(songIndex).get("songPath"));
        mp.prepare();
        mp.start();
        // Displaying Song title
        String songTitle = songsList.get(songIndex).get("songTitle");
        songTitleLabel.setText(songTitle);

        // Changing Button Image to pause image
        btnPlay.setImageResource(R.drawable.btn_pause);

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

        // Updating progress bar
        updateProgressBar();
    } catch (IllegalArgumentException e) {
        e.printStackTrace();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
}

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

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    // TODO Auto-generated method stub
    if (keyCode == KeyEvent.KEYCODE_BACK) {
        mHandler.removeCallbacks(mUpdateTimeTask);
        mp.release();
    }
    return super.onKeyDown(keyCode, event);
}

/**
 * Background Runnable thread
 * */
private Runnable mUpdateTimeTask = new Runnable() {
    public void run() {
        long totalDuration = mp.getDuration();
        long currentDuration = mp.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));
        // System.out.println("Progress : "+progress);
        songProgressBar.setProgress(progress);

        // Running this thread after 100 milliseconds
        mHandler.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
    mHandler.removeCallbacks(mUpdateTimeTask);
}

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

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

    // update timer progress again
    updateProgressBar();
}

/**
 * On Song Playing completed if repeat is ON play same song again if shuffle
 * is ON play random song
 * */
@Override
public void onCompletion(MediaPlayer arg0) {

    // check for repeat is ON or OFF
    if (isRepeat) {
        // repeat is on play same song again
        playSong(currentSongIndex);
    } else if (isShuffle) {
        // shuffle is on - play a random song
        Random rand = new Random();
        currentSongIndex = rand.nextInt((songsList.size() - 1) - 0 + 1) + 0;
        playSong(currentSongIndex);
    } else {
        // no repeat or shuffle ON - play next song
        if (currentSongIndex < (songsList.size() - 1)) {
            playSong(currentSongIndex + 1);
            currentSongIndex = currentSongIndex + 1;
        } else {
            // play first song
            playSong(0);
            currentSongIndex = 0;
        }
    }
}

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