I want to make a simple app that shows a list of contacts (name, surname). My code:

package lista.android;

import java.util.*;

import android.app.ListActivity;
import android.os.Bundle;
import android.widget.*;

class Contact{
    String nume;
    String prenume;

    Contact(String nume, String prenume){
        this.nume=nume;
        this.prenume=prenume;
    }

    public String toString(){
        return prenume +" "+ nume;
    }
}

public class Lista1Activity extends ListActivity {
    /** Called when the activity is first created. */
    ArrayList <Contact> lista;
    ArrayAdapter <Contact> adaptor;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setListAdapter(adaptor);

        lista=new ArrayList<Contact>();
        adaptor=new ArrayAdapter<Contact>(this, R.id.element, lista);

        adaugaContact("Florian", "Iancu");
        adaugaContact("Ioana", "Constantina");

    }

    public void adaugaContact(String nume, String prenume){
        lista.add(new Contact(nume, prenume));
        adaptor.notifyDataSetChanged();
    }
}

In the XML I have the LinearLayout and a TextView that is the list element. When I run it, the simulator says "Sorry, the application [...] has stopped unexpectedly. Please try again." The LogCat tells me I have to have a ListView whose id is android.R.id.lista. If I create a random ListView field in the XML file and give it the "lista" id, it still doesn't work. How to I call that ListView from XML to match something in my Java code? In other words, I know I'm wrong, but where and how do I fix it?