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jb...@google.com <jb...@google.com>
be...@google.com <be...@google.com> #2
Can you attach a sample project that reproduces your issue?
ap...@google.com <ap...@google.com> #3
I'm experiencing this issue in a commercial non-open source project so I'd have to provide extracted code fragments. The menu file for instance looks similar to this:
<menu>
<item
android:id="@+id/destination_one" />
<item
android:id="@+id/destination_two" />
<item
android:id="@+id/destination_three" />
<item
android:id="@+id/destination_four" />
</menu>
The menu item ids match the top level destination ids as for instance destination_one as required by the NavigationUI library.
The xml layout file of the main activity (there is only one activity) looks pretty much like this:
<androidx.coordinatorlayout.widget.CoordinatorLayout>
<androidx.constraintlayout.widget.ConstraintLayout>
<androidx.fragment.app.FragmentContainerView
android:id="@+id/navigation_host_fragment"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="0dp"
app:defaultNavHost="true"
app:layout_constraintBottom_toTopOf="@id/bottom_navigation"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:navGraph="@navigation/main_navigation" />
<com.google.android.material.bottomnavigation.BottomNavigationView
android:id="@+id/bottom_navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/navigation_host_fragment"
app:menu="@menu/main_menu" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.coordinatorlayout.widget.CoordinatorLayout>
The main_navigation
is the first navigation graph I posted in the original post. The behavior I described above only affects the first bottomNavigation item which corresponds to the top level navGraph's startDestination.
il...@google.com <il...@google.com> #4
Yeah, what we're looking for is a full project (i.e., take a brand new project in Android Studio, put your few bits of code in, and make sure your problem reproduces) as there are a lot of little pieces that can make a difference here.
b9...@gmail.com <b9...@gmail.com> #5
Of course the logic of my project is more sophisticated but this reproduces the issue quite well. If you click the first BottomNavigation item N times you need N+1 system back navigation triggers to leave the app.
be...@google.com <be...@google.com> #6
So first, we plan to get rid of these APIs in the future. The only behavior for NavigationUI will be to always save and restore the state of the back stack. Luckily, NavigationUI is purposely built only on publicly available APIs so you could always copy our code and make your custom adjustments for whatever your desired behavior is.
The source of the bug is
We need to add a fix to ensure we take into account the proper destination on our side, but as I mentioned those APIs will go away in the future. So if you wanted to proactively create your own API, you could make your API navigate directly to the start destination instead of the graph. That would allow you to not wait on our release and ensure you always have your desired behavior going forward.
b9...@gmail.com <b9...@gmail.com> #7
Thanks a lot for your help! I basically removed the first embedded graph by moving the code directly into the topmost navGraph and as you said, navigate directly to the start destination. As far as I can tell, it seems to work now.
b9...@gmail.com <b9...@gmail.com> #8
Branch: androidx-main
commit 5624b7cefcfe5e0abb01f1063b040e5f2f135b75
Author: Clara Fok <clarafok@google.com>
Date: Wed Nov 30 16:47:38 2022
Clean up launchSingleTop logic
Basic refactoring in preparation for fix to
Test: ./gradlew navigation:navigation-runtime:cC
Bug: 253256629
Change-Id: Ib65764c345451d8be4613f6e3d278cc1a170091e
M navigation/navigation-runtime/src/main/java/androidx/navigation/NavController.kt
ap...@google.com <ap...@google.com> #9
Branch: androidx-main
commit f433d5458950a632900f8a2685ce6eab27272f8c
Author: Clara Fok <clarafok@google.com>
Date: Thu Dec 01 15:52:28 2022
Fix BottomNavView launchSingleTop with NavGraph
NavController previously did not apply launchSingleTop when user repeatedly navigates to the starting destination of a Menu when this starting destination is a NavGraph. This results in the destination being added mulitple times to backstack.
Now NavController checks if the destination is a NavGraph and if so, adds all destinations from the node to its final startDestination (i.e. nested nav graphs) to singleTop.
NavController backstack and Navigator backstacks entries are replaced accordingly upon singleTop navigations.
Test: ./gradlew navigation:navigation-runtime:cC
Bug: 253256629
Relnote: singleTop now works with NavGraph such that if the top destination of the backstack is a NavGraph's startDestination, all destinations starting from original destination to its startDestination will only be added to the top of the backstack once.
Change-Id: Id4bea16aff3dd776826fc6d746475e293eb64b0e
M navigation/navigation-common/src/main/java/androidx/navigation/NavigatorState.kt
M navigation/navigation-runtime/src/androidTest/java/androidx/navigation/NavControllerTest.kt
M navigation/navigation-runtime/src/main/java/androidx/navigation/NavController.kt
b9...@gmail.com <b9...@gmail.com> #10
This has been fixed internally and will be available in Navigation 2.6.0-alpha05
il...@google.com <il...@google.com> #11
The following release(s) address this bug.It is possible this bug has only been partially addressed:
androidx.navigation:navigation-common:2.6.0-alpha05
androidx.navigation:navigation-runtime:2.6.0-alpha05
b9...@gmail.com <b9...@gmail.com> #12
za...@gmail.com <za...@gmail.com> #13
I believe I'm facing another issue because of this fix:
When navigating to an activity that belongs to a dynamic module, the AbstractProgressFragment
is not removed from the back stack. The line that's supposed to do it was moved from onResume
to onViewCreated
:
if (navigated) {
findNavController().popBackStack()
return
}
And onViewCreated
is not called since we're coming back from another activity.
Moving that block back to the onResume
method should solve the problem. In the meantime (as a workaround), I guess we can do as follows:
class CustomProgressFragment : AbstractProgressFragment() {
private var navigated = false
override fun onResume() {
super.onResume()
// Workaround:
// AbstractProgressFragment is not being removed from the back stack when returning from another activity
if (navigated) findNavController().popBackStack()
}
override fun onInstalled() {
testing = true
}
...
...
}
za...@gmail.com <za...@gmail.com> #14
Update:
Regarding the workaround I mentioned, this is the correct implementation of the onInstalled
method
override fun onInstalled() {
navigated = true
}
il...@google.com <il...@google.com> #15
Re onViewCreated()
is indeed called when you return to the AbstractProgressFragment
from another fragment, which is the only thing your newly loaded graph should have as its start destination. You...don't happen to have a start destination that is an activity destination? You shouldn't be using Dynamic Navigation at all in that case (as the system will auto-download the module your activity is in upon request).
Description
Component used: androidx.navigation:navigation-dynamic-features-fragment
Version used:2.3.0 Devices/Android versions reproduced on: all devices/android versions
override fun onResume() { super.onResume() if (navigated) { findNavController().popBackStack() return } var monitor = installViewModel.installMonitor if (monitor == null) { Log.i(TAG, "onResume: monitor is null, navigating") navigate() monitor = installViewModel.installMonitor } if (monitor != null) { Log.i(TAG, "onResume: monitor is now not null, observing") monitor.status.observe(this, StateObserver(monitor)) } }
Any time onResume() is called, monitor.status observed. When dynamic feature module is installed, each StateObserver will call navigate() and destination activity/fragment will be navigated multiple time