Single Selection ListView in android

< ?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    > 
     <ListView
            android:id="@android:id/list"
            android:cacheColorHint="#00000000"
            android:scrollbars="none"
            android:fadingEdge="vertical"
            android:soundEffectsEnabled="true"
            android:dividerHeight="1px"
            android:padding="5dip"
            android:smoothScrollbar="true"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:drawSelectorOnTop="false"
            android:layout_marginLeft="10dip"
            android:layout_marginRight="10dip"
            android:layout_marginBottom="10dip"
            android:layout_weight="1"/> 

</LinearLayout> 

public class ListView1 extends ListActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        String[] phonenames = new String[] { "Android", "Windows7","Symbian", "iPhone",
                "Android", "Windows7", "Symbian", "iPhone",
                "Android", "Windows7", "Symbian", "iPhone" };
        setListAdapter(new ArrayAdapter<string>(this,
                                      android.R.layout.simple_list_item_single_choice,android.R.id.text1, phonenames));
        ListView list = getListView();
        list.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

    }
}