I went through your Jetpack Navigation tutorial and got hung up on step 12 to create your own shopping cart fragment. I did not realize the id's in the mobile_navigation.xml and the main_menu.xml need to match. Typically id's are unique, so this part was not intuitive. It would have been nice to know this under part 9 of the tutorial. Maybe a side note?
Thanks for reporting this and the feedback and apologies about the confusion. We do mention this in step 9, I'm bolding and underlining it, since it's easily missed.
I went through your Jetpack Navigation tutorial and got hung up on step 12 to create your own shopping cart fragment. I did not realize the id's in the mobile_navigation.xml and the main_menu.xml need to match. Typically id's are unique, so this part was not intuitive. It would have been nice to know this under part 9 of the tutorial. Maybe a side note?