![]() With the new Navigation Architecture Component Google introduces a similar concept which uses a NavHostFragment hosting a NavController operating on a navigation graph. The “new” pattern behavior is about to maintain the view state a user left in one section when navigating back to it. ![]() Other approaches popped up, like the Conductor framework making it possible to maintain different controller-based backstacks attached to different Router’s used in one Activity. ![]() Therefore the "old" pattern behavior was about to remove the whole backstack when the user switched from one section to another.īut this wasn’t the best user experience. Building up a backstack for each single view section accessible by the Bottom Navigation bar was impossible. Here is one way to handle popping off a certain subset of the backstack yourself by keeping track of how many subscreens are on the stack: When I. ![]() The FragmentManager used for dealing with fragments within an Activity only knows one backstack. One solution: manage the backstack yourself. The common architectural approach for such a top level navigation would be to make use of Fragments which are added/replaced in a FrameLayout serving as a holder in the Activity's view hierarchy. Meanwhile Google introduced the Bottom Navigation bar as an implementation. The goal was to give the user quick access to 3–5 top-level destinations in an Android app, but an appropriate implementation was missing for long time. The bottom navigation was introduced 2 years ago as a material design pattern. Mastering the Bottom Navigation with the new Navigation Architecture Component Bottom Navigation
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