flutter加载图片问题

1、加载asset图片：

Container(
  child: Image.asset("assets/xxx",cacheWidth: xxx,cacheHeight:xxx, fit: BoxFit.xxx),
)

Image.asset("assets/xxx",cacheWidth: xxx,cacheHeight:xxx, fit: BoxFit.xxx)

比如原图大小为1200 X 900,此时设置cacheWidth为400,cacheHeight为300，按照比例设置，避免报：has a display size of XXX×XXX but a decode size of XXX×XXX, which uses an additional XXXKB.错误。