listview 选择后高亮显示

public class UserTypeParentAdapter extends MyBaseAdapter<UserTypeList> {
    private int selectItem = -1;

    public UserTypeParentAdapter(Context context, List<UserTypeList> datas) {
        super(context, datas);
    }

    public void setSelectItem(int selectItem) {
        this.selectItem = selectItem;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = mInflater.inflate(R.layout.usertype_superclass_item,null);
        }
        TextView txtTitle = ViewHolder.get(convertView, R.id.txt_title);
        txtTitle.setText(mDatas.get(position).getTypename());
        if (position == selectItem) {
            txtTitle.setSelected(true);
            txtTitle.setEnabled(true);
        } else {
            txtTitle.setSelected(false);
            txtTitle.setEnabled(false);
        }
        return convertView;
    }

}

    lv_superclass.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                adapterParent.setSelectItem(position);  
                adapterParent.notifyDataSetInvalidated();  
            }
        });

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50.0dip"
    android:orientation="vertical" >

    <TextView 
        android:id="@id/txt_title"
        android:layout_width="match_parent"
        android:layout_height="50.0dip"
        android:background="@drawable/usertype_super_select"
        android:drawableRight="@drawable/arrows_identity_select"
        android:gravity="center"
        android:textColor="@color/login_font"
        android:textSize="16.0sp" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:state_enabled="true" android:state_focused="true" android:drawable="@color/white"></item>
    <item android:state_enabled="true" android:state_selected="true" android:drawable="@color/white"></item>
    <item android:state_pressed="true" android:drawable="@color/white"></item>
    <item android:drawable="@color/layout_bg"></item>

</selector>