android MVVM ItemViewSelector achieve different list of view types

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public final ItemViewSelector<String> itemView = new ItemViewSelector<String>() { 
   
    @Override
    public void select(ItemView itemView, int position, String item) {
        itemView.set(BR.item, position == 0 ? R.layout.item_header : R.layout.item); //此处切换视图类型
    } 
 
    // This is only needed if you are using a BindingListViewAdapter
    @Override
    public int viewTypeCount() {
        return 2;
    }
};