关于Android中BottomNavigationView的问题

Question

I have general questions about BottomNavigationView. I would like to have a BottomNavigationView in each of my Activities in an App for ordering something (eg food). It should have 4 buttoms:

• Back
• Info
• Stats
• My Orders

With 'Back' the app should just go back to the previous activity. The buttoms 'Stats' and 'My Orders' should switch to a persistent activity that should not be destroyed when not being displayed. 'My Orders' should display the last orders. The buttom 'Info' should only display some information about the current item or current menu (depending from which activity it is called). So basically I have 2 questions:

1. Should the Activities 'Info', 'Stats', and 'My Orders' be real Activities or just Fragments? Normally I think that at leat 'Stats', and 'My Orders' should be real Activities as they are persistent. But in many BottomNavigationView only Fragments are used?
2. How can I pass content information to the Activity/Fragment 'Info'. This Activity/Fragment should display information based on the Activity is was called from. Let's say the Activities are different dishes. Do I have to create a separate Info-Activity/Fragment for each dish? Or can I somehow define a dynamic Activity/Fragment that displayes information based on the current Activity?

I'd appreciate every comment and I'd really appreciate your help.

Answer 1

1. The recommended approach is Single Activity and Multiple fragments . You can do this using Jetpack's Navigation Component
2. In case you need to pass data from an Activity/Fragment to the new calling Fragment , it can be done by setting arguments on the calling fragment and then getting it on the called fragment . If there is something which requires to be dynamic, for example- dishes fragment , make a single fragment and common layout and load the data dynamically from the backend .

For Setting Arguments , this should help

How to pass a variable from Activity to Fragment, and pass it back?

Note: You can use fragment without using Navigation Components but you have to use FragmentManager and FragmentTransaction and also have to maintain the Backstack by yourself which could be quite complicated