public class MainActivity extends Activity implements AdapterView.OnItemClickListener {

    private ArrayList<String> audioList;
    private File file;
    private ListView lvAudio;
    private Context context;
    private Adapter Adaptr;
    private Handler durationHandler = new Handler();

    double timeElapsed = 0, finalTime = 0;
    int forwardTime = 2000, backwardTime = 2000;

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

        audioList = new ArrayList<String>();

        String root_sd = Environment.getExternalStorageDirectory().toString();
        file = new File( root_sd + "/Music/AudioFile/" ) ;
        File list[] = file.listFiles();

        for( int i=0; i< list.length; i++)
        {
            audioList.add(list[i].getName());
            Log.e("Checking","Checking"+audioList.get(i));
        }
        getid();

        Adaptr = new Adapter(MainActivity.this,audioList);
        lvAudio.setAdapter(Adaptr);
        Adaptr.notifyDataSetChanged();

        setListner();
    }

    private void setListner() {

        lvAudio.setOnItemClickListener(this);
    }

    private void getid() {

        lvAudio =(ListView)findViewById(R.id.lvAudio);
    }

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

        final String fileName = audioList.get(position);
        final String path = "/Music/AudioFile/";
        Log.e("Checking File:", "Checking=======:" + fileName);

        final MediaPlayer mp = MediaPlayer.create(MainActivity.this, Uri.parse(Environment.getExternalStorageDirectory().getPath() + path + fileName));

        final ImageView  imgPlay = (ImageView)view.findViewById(R.id.imgPlay);
        final ImageView imgPause =(ImageView)view.findViewById(R.id.imgPause);
        final TextView tvTotalTime =(TextView)view.findViewById(R.id.tvTotalTime);
        final TextView duration =(TextView)view.findViewById(R.id.duration);
        final SeekBar seekbar = (SeekBar)view.findViewById(R.id.seekbar);

//        Handler class to change seekbar
       final Runnable updateSeekBarTime = new Runnable() {
            public void run() {
                //get current position
                timeElapsed = mp.getCurrentPosition();

                finalTime = mp.getDuration();
                //set seekbar progress
                seekbar.setProgress((int) timeElapsed);

                tvTotalTime.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes((long) finalTime), TimeUnit.MILLISECONDS.toSeconds((long) finalTime)));

                //set time remaing
                double timeRemaining = finalTime - timeElapsed;
                duration.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining), TimeUnit.MILLISECONDS.toSeconds((long) timeRemaining) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) timeRemaining))));

                //repeat yourself that again in 100 miliseconds
                durationHandler.postDelayed(this, 100);
            }
        };

        seekbar.setClickable(true);

        seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

                if (fromUser) {
                    mp.seekTo(progress);
                }
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });


       imgPlay.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {

               if (mp.isPlaying()) {
                   mp.reset();
               } else {
                   mp.start();
                   Toast.makeText(MainActivity.this, "Playing", Toast.LENGTH_SHORT).show();
                   timeElapsed = mp.getCurrentPosition();
                   seekbar.setProgress((int) timeElapsed);
                   durationHandler.postDelayed(updateSeekBarTime, 100);
                   finalTime = mp.getDuration();
                   seekbar.setMax((int) finalTime);
                   imgPlay.setVisibility(View.INVISIBLE);
                   imgPause.setVisibility(View.VISIBLE);
               }
           }
       });

        imgPause.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                mp.pause();
                imgPause.setVisibility(View.INVISIBLE);
                imgPlay.setVisibility(View.VISIBLE);
                Toast.makeText(MainActivity.this, "Paused..............", Toast.LENGTH_SHORT).show();
            }
        });

        mp.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
            @Override
            public void onCompletion(MediaPlayer mp) {

                imgPause.setVisibility(View.INVISIBLE);
                imgPlay.setVisibility(View.VISIBLE);
            }
        });

    }
}


Adapter:

public class Adapter extends BaseAdapter {

    ArrayList<String> audioList;
    Context context;
    private static LayoutInflater inflater = null;
    private MediaPlayer mediaPlayer=new MediaPlayer();
    public Adapter(MainActivity mainActivity, ArrayList<String> audioList) {

        this.context = mainActivity;
        this.audioList = audioList;
    }
    @Override
    public int getCount() {
        return audioList.size();
    }

    @Override
    public Object getItem(int position) {
        return position;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    public class Holder {
        public ImageView imgIcon, imgPlay, imgPause, imgStop;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

        View myView = convertView;

        if (myView == null) {
           ImageView imgIcon, imgPlay, imgPause, imgStop;
            SeekBar seekbar;
            LayoutInflater inflater = LayoutInflater.from(context);
            myView = inflater.inflate(R.layout.video_adapter, null);
            TextView tvTotalTime,duration;
        }

        return myView;
    }
}