Android Dice Roll App - Need Help!

[iMaxtr]

Hi, I'm trying to make a simple dice roller app.
This is what I want to be able to do.

The game allows player throwing an arbitrary number of dice (1-6). Each die can show the number from 1 to 6 if thrown. On each throw you are to calculate the sum of all dice thrown
If your single iteration yielded 7, 11, 21 the player won the game
If your single iteration yielded 13 or 26 the player lost the game
The player can go for maximum of 6 iterations. They can change the number of dice in each iteration.
You must keep the running sum of all iterations. If the sum is exactly 120 the player won the game.

Can anyone tell me how this can be done? I've tried searching for dice roll apps to get some understanding of how it can be done, but didn't find any source code. I'm new to programming, so any help will be greatly appreciated, thanks.

This is what I have sofar.

import java.util.Random;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class dicroller extends Activity
{
    private TextView firstRollResult;
    private TextView secondRollResult;
    private TextView thirdRollResult;
    private TextView finalResult;
    private Button rollerButton;
    private Random rand = new Random();
    private String[] fRoll = new String[] { "1", "2", "3", "4", "5", "6" };
    private String[] sRoll = new String[] { "1", "2", "3", "4", "5", "6" };
    private String[] tRoll = new String[] { "1", "2", "3", "4", "5", "6" };
    private int total = 0;
    private int numOfRolls = 6;
    int firstResult;
    int secondResult;
    int thirdResult;

    
    private OnClickListener buttonClickListener = new OnClickListener() {
        public void onClick( View v )
        {

                
            int num = rand.nextInt( fRoll.length );
            String fresult = fRoll[num];
            firstResult = Integer.parseInt(fresult);
            firstRollResult.setText( fresult );
            
            int numTwo = rand.nextInt( sRoll.length );
            String sresult = sRoll[numTwo];
            secondResult = Integer.parseInt(sresult);
            secondRollResult.setText( sresult );
            
            int numThree = rand.nextInt( sRoll.length );
            String tresult = tRoll[numThree];
            thirdResult = Integer.parseInt(tresult);
            thirdRollResult.setText( tresult );
        
            
            //total = firstResult + secondResult + thirdResult;
            //finalResult.setText( total );
            }

        };
  
    
    @Override
    public void onCreate( Bundle savedInstanceState )
    {
        super.onCreate( savedInstanceState );
        setContentView( R.layout.main );
        
        firstRollResult = (TextView)findViewById( R.id.firstRollResult );
        secondRollResult = (TextView)findViewById( R.id.secondRollResult );
        thirdRollResult = (TextView)findViewById( R.id.thirdRollResult);
        finalResult = (TextView)findViewById( R.id.total);
        rollerButton = (Button)findViewById( R.id.rollerButton );
        
        rollerButton.setOnClickListener( buttonClickListener );
    }
}

When I add the total code to calculate the total of all the dice rolls the application just crashes.