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ChoiceChip 选中
Expanded 可以将widget的大小设置为适和行或列
Stack 使用Stack来组织需要重叠的widget。widget可以完全或部分重叠底部widget。
InkWell 添加Material触摸水波效果
#相关框架 网络请求 dio 一个强大易用的dart http请求库，支持Restful API、FormData、拦截器、请求取消、 Cookie管理、文件上传/下载
序列化 json_serializable和built_value
#框架学习 rxdart fluro fluwx flutter_redux