قرار دادن تایمر در media player

سلام خدمت دوستان.من میخواستم تو این کد یک تایمر هم قرار بدم که  شامل دو قسمت باشه(زمان فعلی و کل زمان موزیک).میشه راهنمایی کنید؟(اگر کد هم بدین ممنون میشم).

 package shahkar.app.bookdo;

import android.app.Activity;
import android.content.SharedPreferences;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;


public class Activity_s1 extends Activity {

    SeekBar     seekBar;
    MediaPlayer mediaplayer;

    ImageView   pause_btn;
    ImageView   play_btn;
    TextView    txt_zamanefeli;


    @Override
    public void onBackPressed() {
        // TODO Auto-generated method stub

        mediaplayer.stop();

        Activity_s1.this.finish();
        mediaplayer.stop();

    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.s1);
        SharedPreferences shp = getSharedPreferences("sett", MODE_PRIVATE);
        boolean chbt = shp.getBoolean("chk", true);

        if (chbt)
            getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        pause_btn = (ImageView) findViewById(R.id.pause_btn);
        play_btn = (ImageView) findViewById(R.id.play_btn);
        seekBar = (SeekBar) findViewById(R.id.slider);
        mediaplayer = MediaPlayer.create(Activity_s1.this, R.raw.d1);

        // ######### az rooye moshakhasate file soti seekbar ro tanzim mikonim...
        mediaplayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {

            @Override
            public void onPrepared(MediaPlayer mediaPlayer) {

                seekBar.setMax(mediaplayer.getDuration());
                seekBar.postDelayed(onEverySecond, 1000);
            }
        });

        // ########## mediaplayer ro start mikonim
        mediaplayer.start();

        // ############## baraye inke vaghti seekbar ro jabeja mikonid...
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {}


            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {}


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

                if (fromUser) {
                    // vaghti seek bar ro jabeja mikonim inja ejra mishe...
                    mediaplayer.seekTo(progress);

                }
            }
        });

        //dokmeye pause
        pause_btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                mediaplayer.pause();
            }
        });

        //dokmeye play
        play_btn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View view) {
                mediaplayer.start();

                // tanzim e dobareye seekbar bad az inke dobare play kardim
                seekBar.setMax(mediaplayer.getDuration());
                seekBar.postDelayed(onEverySecond, 1000);

            }
        });

        ///////////////////////////
    } // end of onCreate
      /////////////////////////    
      //  in ye joor timer hast ke har sanie yek bar seekbar ro update mikone

    private Runnable onEverySecond = new Runnable() {

                                       @Override
                                       public void run() {
                                           if (seekBar != null) {
                                               seekBar.setProgress(mediaplayer.getCurrentPosition());

                                           }

                                           if (mediaplayer.isPlaying()) {
                                               seekBar.postDelayed(onEverySecond, 1000);
                                           }
                                       }
                                   };

}