Timer funktioniert nur in innerer Klasse?!

public String timer(long milliSecs)
{
    int year,day,hour,min,sec;


    year=milliSecs%31 556 926 000;
    milliSecs-=year*31 556 926 000;

    day=milliSecs%86 400 000;
    milliSecs-=day*86 400 000;

    hour=milliSecs%3 600 000;
    milliSecs-=hour*3 600 000;

    minute=milliSecs%60 000;
    milliSecs-=minute*60 000;

    sec=milliSecs%1 000;
    milliSecs-=sec*1 000;


   return (year + " years, " + day + " days, " + hour + ... + milliSecs + " ms")
  
   
}

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


public class GameActivity extends Activity implements View.OnClickListener {

    Button tButton, stButton;
    TextView tss;  //tss = timeSetStart
    //Zahl zahl = new Zahl();
    Counter timer = new Counter(60000, 1000);


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.game);
        tButton = (Button) findViewById(R.id.tButton);
        tButton.setOnClickListener(this);
        stButton = (Button) findViewById(R.id.stButton);
        stButton.setOnClickListener(this);

        tss = (TextView) findViewById(R.id.time);
        tss.setText(timer.zwei);
        //tss.setText(zahl.sechs);
        //timer.start();

    }

    @Override
    public void onClick(View v){
        switch (v.getId()){
            case R.id.tButton:
                timer.start();
                break;
            case R.id.stButton:
                timer.cancel();
        }

    }

    }

import android.os.CountDownTimer;
import java.util.concurrent.TimeUnit;





    public class Counter extends CountDownTimer {

public String zwei = "2";



        public Counter(long millisInFuture, long countDownInterval) {
                super(millisInFuture, countDownInterval);

            }


            @Override
            public void onTick(long millisUntilFinished) {


                long millis = millisUntilFinished;
                 String hms = String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
                        TimeUnit.MILLISECONDS.toMinutes(millis) -  TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis))/
                        TimeUnit.MILLISECONDS.toSeconds(millis) -  TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis)));
                System.out.println(hms);



            }


            @Override
            public void onFinish() {

            }

        }