Change android.R.layout to R.layout

package com.example.b1.lab4_3;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

import java.util.List;

public class ShowUserActivity extends ListActivity {
private UserDataSource datasource;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    datasource = new UserDataSource(this);
    datasource.open();
    final List<UserRecord> values = datasource.getAllUsers();
    setListAdapter(new ArrayAdapter<UserRecord>(this,
            android.R.layout.simple_list_item_2,
            android.R.id.text1, //this will be ignored by getView
            values) {
        @Override
        public View getView(int position, View convertView,
                            ViewGroup parent) {
//Must return a View
            View view = super.getView(position, convertView,
                    parent);
            UserRecord entry = values.get(position);
            TextView text1 =
                    (TextView) view.findViewById(android.R.id.text1);
            TextView text2 =
                    (TextView) view.findViewById(android.R.id.text2);
            text1.setText(entry.getName());
            text2.setText(entry.getEmail());
            return view;
        }
    });
}

@Override
protected void onResume() {
    datasource.open();
    super.onResume();
}

protected void onPause() {
    datasource.close();
    super.onPause();
}
}

Currently i have a Layout.xml name activity_show_cart.xml, the activity display the layout in simple_list_item_2, that is android.R.layout.simple_list_item_2. How to change it to R.layout.activity_show_cart instead of android.R.layout.simple_list_item_2? this one is for me to retrieve the detail from database. Because when i change it to R.layout.activity_show_cart, it will display error.