--- title: AS BottomNavigation does not have a NavController set url: 'https://yayi.site/archives/asbottomnavigationdoesnothaveanavcontrollerset' categories: andriod cover: 'https://cdn.jsdelivr.net/gh/yan-bolan/picbed/img/动漫/結城友奈は勇者である/三ノ·輪 銀.png' tags: 'Navigation,ANDROID' abbrlink: 8075a9b0 date: 2020-09-13 22:06:36 updated: 2021-05-14 22:01:06 ---  ### 使用AS 生成 activity BottomNavigation 结果 ：==does not have a NavController set== \[google stackoverflow\](https://www.google.com/url?sa=t\&rct=j\&q=\&esrc=s\&source=web\&cd=\&cad=rja\&uact=8\&ved=2ahUKEwiju62wpebrAhWXPXAKHWm5CtIQFjAAegQICxAB\&url=https://stackoverflow.com/questions/50502269/illegalstateexception-link-does-not-have-a-navcontroller-set\&usg=AOvVaw0sI_JbKbtRrzzed_tldnsb) ### 不行 重新生成 一个项目 as 生成BottomNav就能运行 ### 于是把 启动activity 换为 Navigation 排查错误 \[https://www.cnblogs.com/zHQQQQ/p/12696995.html\](https://www.cnblogs.com/zHQQQQ/p/12696995.html) ### 我之前项目设置了NoactionBar 而且 setContentView 的布局 应该是 !\[在这里插入图片描述\](http://img.yayi.site/csdn/20200913220402493.png-watermaskStyle) R8: !\[在这里插入图片描述\](http://img.yayi.site/csdn/20200913220435706.png-watermaskStyle) !\[在这里插入图片描述\](http://img.yayi.site/csdn/20200913220525406.png-watermaskStyle) \[移除actionBar\](https://stackoverflow.com/questions/50545521/removing-action-bar-in-bottomnavigation-view)