41、使用AppBarLayout+CollapsingToolbarLayout+toolbar实现自定义工具栏折叠效果

https://blog.csdn.net/sinat_28238111/article/details/77892214

https://github.com/CTSN/TestCollapsingToolbarLayout

https://www.jianshu.com/p/c643d277fe41

https://blog.csdn.net/u012045061/article/details/69568807?utm_source=blogkpcl13