Timer con countdown de android

package com.Timer_con_countdown;
 
import android.app.Activity;
import android.os.Bundle;
import android.os.CountDownTimer;
import android.widget.TextView;
 
public class Timer_con_countdown extends Activity {
	Contador counter;
	TextView texto;
 
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
 
        texto = (TextView) findViewById(R.id.txt);
        counter = new Contador(10000,1000);
 
        counter.start();
    }
 
    public void fin(){
    	texto.setText(texto.getText() + "FIN");
    }
 
    public void hola(){
    	texto.setText(texto.getText() + "Hola\n");
    }
 
    public class Contador extends CountDownTimer{
 
    	public Contador(long millisInFuture, long countDownInterval) {
    		super(millisInFuture, countDownInterval);
    	}
 
    	@Override
    	public void onFinish() {
    		fin();
    	}
 
    	@Override
    	public void onTick(long millisUntilFinished) {
    		hola();
    	}
 
    }
}