[Android] Bottom Navigation

[junseokseo9306]

🤷‍♂️ Description

• Android Navigation bottom bar fragment changing error

📝 Primary Commits

• [x] define error
• [ ] solution

[junseokseo9306]

How to organize multiple backstack in Navigation

Navigation backstack error

what happened?

• Error: jetpack navigation back stack is not connected with each bottom navigation section. upper error happened when the user travels one of the bottom navigation sections and then, clicks to the other bottom section.

• Expectation :

  • setup of multiple back stack is clearly separate nav layouts in each category.
  • bottom navigation plays back stack popup whenever clicks other bottom navigation view

• Solution :

  • separate fragments in the bottom navigation section

  xmlns:app="http://schemas.android.com/apk/res-auto"  
  xmlns:tools="http://schemas.android.com/tools"  
  android:id="@+id/nav_home"  
  app:startDestination="@id/home">  
  <include app:graph="@navigation/home" />  
  <include app:graph="@navigation/record" />  
  <include app:graph="@navigation/community" />  
  <include app:graph="@navigation/user" />  
  </navigation>

  • override back button to prohibit navigation savestatehandle to provide saved data to the planner fragment
  • hide the bottom view when a user edits exercises in planner Fragment

    navController.addOnDestinationChangedListener { _, destination, _ ->  
    when (destination.id) {  
    R.id.plannerFragment -> hideBottomNav()  
    R.id.exerciseSelectFragment -> hideBottomNav()  
    R.id.exerciseDetailFragment -> hideBottomNav()  
    else -> showBottomNav()  
    }}

• Question:

  • How to edit bottom navigation error in a direct way?
  • What happens in navigation back stack