一、认识GridView 前面学的ListView是列表， 这里的GridView就是显示网格，用于在界面上按行、列分布...
extended list(ListView/GridView) support track collect garbage of children/viewport indexes, build lastChild as special child in the case that it is loadmore/no more item and enable to layout close to trailing. - GitHub - fluttercandies/extended_list: ex