扩展列表视图子项中的问题

Question

例如假设Foodmenu是该汉堡中的父项，piza是列表子菜单，另一个父项目商店菜单在该蔬菜店，非蔬菜店是列表submneu.Now当我点击Foodmenu它显示正确的数据。下一个我点击Shopmenu它显示商店菜单数据，但在Foodmenu daata更改它显示商店菜单数据我该如何解决？

private Context context;
private ArrayList<String> Mainmenu;
private ArrayList child;
private ArrayList<Object> Submenu;
String[] sub;

@Override

public View getChildView(int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {

    View view = convertView;
    if(view == null){

        LayoutInflater inflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        view = inflater.inflate(R.layout.child_layout, parent, false);

    }

    TextView childItem = (TextView)view.findViewById(R.id.child_layout);
    String item=Submenu.get(groupPosition).toString().replace("[","").replace("]","").replace("\"", "");
        Log.e("Submenu",""+Submenu.get(0).toString());
    sub=item.split(",");
    Log.e("sub",""+sub);

        for (int k = 0; k < sub.length; k++) {
            child.add(sub[k]);
            childItem.setText(child.get(childPosition).toString());

        }


    return view;

}