Tabhost open a new acitivity after clicking on a list

I'm a beginner in android, my question is the following. I knew the TabHost component and found it very interesting to implement it in the application. The app has a list with restaurants and the person chooses the restaurant it opens another acitivity with the menus according to the chosen restaurant, it is working however when I choose the restaurant it opens a new activity and Tabhost disappears. My question is the following how to open this new Activity inside the tabhost (tabspec)? Here is the code:

Creating tabs:

public class tabs extends TabActivity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.activity_pedido);

        // create the TabHost that will contain the Tabs
        TabHost tabHost = (TabHost) findViewById(android.R.id.tabhost);
        tabHost.setup();

        TabSpec tab1 = tabHost.newTabSpec("Aba 1");
        tab1.setContent(new Intent(this, lista_restaurantes.class));
        tab1.setIndicator("",
                getResources().getDrawable(R.drawable.ic_restaurante));

        TabSpec tab2 = tabHost.newTabSpec("Aba 2");
        tab2.setIndicator("", getResources().getDrawable(R.drawable.ic_promo));
        tab2.setContent(new Intent(this, promocoes.class));

        TabSpec tab3 = tabHost.newTabSpec("Aba 3");
        tab3.setIndicator("",
                getResources().getDrawable(R.drawable.ic_carrrinho));
        tab3.setContent(new Intent(this, carrinho.class));

        /** Add the tabs to the TabHost to display. */
        tabHost.addTab(tab1);
        tabHost.addTab(tab2);
        tabHost.addTab(tab3);

        tabHost.setCurrentTab(0);
    }
}

It loads the class lista_restaurante into TabSpec

public class lista_restaurantes extends ListActivity {

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

    // Hashmap for ListView
    restauranteList = new ArrayList<HashMap<String, String>>();

   // chama restaurante
   new restaurante().execute()
    // Cria lista com Vendas no Dia
    ListView lv = getListView();

    // Quando Selecionar um restaurante
    lv.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            // OBTEM o valor da ID
            String pid = ((TextView) view.findViewById(R.id.pid)).getText()
                    .toString();

             Chama intent com o cardapio de acordo com restaurante
             Intent intent = new
            Intent(lista_restaurantes.this,lista_caradapio.class);

             intent.putExtra(TAG_PID, pid);

             Chama a acctivity lista_cardapio
            startActivity(intent);
        }
    });

}

How to call lista_cardapio.class within tabspec?