Today understand the jetpack provide navigation components, see a person's blog, link is as follows: https://blog.csdn.net/yucihan/article/details/80596537

Believe that everyone should be used, I found that after the fragments to jump to another fragments, click the back button will create again, but for most of the demand is certainly not every switch to create, so want to ask is what you need to set parameters, and can only be rebuilt every time fragments, please answer!!!!!!!!!!!!!!!