How to get total song duration of songs provided in array

How can I provide ending text view the song duration that gets an increment whenever it gets a new song, it is just showing the total duration of the first song it gets, for all the songs.

package com.example.lec8;

import androidx.appcompat.app.AppCompatActivity;

import android.drm.DrmStore;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;
import java.util.concurrent.TimeUnit;

public class MainActivity extends AppCompatActivity {
    int [] song_list = {R.raw.b,R.raw.k,R.raw.n};
    int c_pos = 0;
    Button foward,p,rewind,stop;
    TextView starting,ending;
    SeekBar sb;
    CountDownTimer t;
    MediaPlayer mp;
    private static int  sTime =0;
    private Handler hdlr = new Handler();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        foward = findViewById(R.id.btfoward);
        rewind = findViewById(R.id.btrewind);
        stop = findViewById(R.id.btpause);
        p = findViewById(R.id.btplay);
        starting = findViewById(R.id.startduration);
        ending = findViewById(R.id.lastduration);
        sb = findViewById(R.id.skbar);
        mp = MediaPlayer.create(this, song_list[c_pos++]);
        mp.start();
        int s_duration = mp.getDuration();
        sTime = mp.getCurrentPosition();

        ending.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes((long) s_duration), TimeUnit.MILLISECONDS.toSeconds((long) s_duration) -
                        TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long)s_duration))));

           
*/
            starting.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes(sTime),
                    TimeUnit.MILLISECONDS.toSeconds(sTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(sTime))));
            sb.setProgress(sTime);
            hdlr.postDelayed(UpdateSongTime, 100);

        sb.setMax(s_duration);
        t = new CountDownTimer(s_duration, 250) {
            @Override
            public void onTick(long millisUntilFinished) {
                sb.setProgress((mp.getCurrentPosition()));
            }
            @Override
            public void onFinish() {
                Toast.makeText(MainActivity.this, "Song Completed", Toast.LENGTH_SHORT).show();
            }
        };
        sb.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                mp.seekTo(seekBar.getProgress());
            }
        });
        t.start();
        foward.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (c_pos <= 1) {
                    c_pos++;
                    mp.reset();
                    mp = MediaPlayer.create(getApplicationContext(), song_list[c_pos]);
                    mp.start();
                } else {
                    Toast.makeText(getApplicationContext(), "No more songs", Toast.LENGTH_LONG).show();
                }
            }
        });
        rewind.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (c_pos >= 1) {
                    c_pos--;
                    mp.reset();
                    mp = MediaPlayer.create(getApplicationContext(), song_list[c_pos]);
                    mp.start();
                } else {
                    Toast.makeText(getApplicationContext(), "No more songs", Toast.LENGTH_LONG).show();
                }
            }
        });
        stop.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mp.pause();
                stop.setVisibility(Button.INVISIBLE);
                p.setVisibility(Button.VISIBLE);
            }
        });
        p.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mp.start();
                p.setVisibility(Button.INVISIBLE);
                stop.setVisibility(Button.VISIBLE);
            }
        });
    }
    private Runnable UpdateSongTime = new Runnable() {
        @Override
        public void run() {
            sTime = mp.getCurrentPosition();
            starting.setText(String.format("%d min, %d sec", TimeUnit.MILLISECONDS.toMinutes(sTime),
                    TimeUnit.MILLISECONDS.toSeconds(sTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(sTime))) );
            sb.setProgress(sTime);
            hdlr.postDelayed(this, 100);
        }
    };
}