I am using Google's recommended single activity pattern with Android Jetpack's Navigation component.
Fragment 1 is an authentication screen. After the user is authenticated and navigates to Fragment 2, I would like to make pressing of the Android back button close the app, and remove the back arrow in the app bar.
I have found methods, like onBackPressedDispatcher, to add / remove functionality from the back press, but nothing that also removes the back arrow.
I have also tried app:popUpTo="@+id/firstFragment" when navigating from Fragment 1 to Fragment 2, but that doesn't work either.
This should be possible to specify with a single line of code. Still trying to find. Any tips?
You need to remove fragment1 from back-stack when navigation to fragment2
fragment1
<fragment
android:id="@+id/fragment1"
android:name="packagenameforFragment1"
android:label="fragment1"
tools:layout="@layout/fragment_1" >
<action
android:id="@+id/action_Fragment1_to_Fragment2"
app:destination="@id/Fragment2_id"
app:launchSingleTop="true"
app:popUpTo="@+id/your_MainGraph_id"
app:popUpToInclusive="true" />
then when you navigate from fragment1 to fragment2 call this
findNavController(fragment).navigate(R.id.action_Fragment1_to_Fragment2)
to remove the back button from Fragment2 you can use this
in Activity onCreate()
val appBarConfiguration = AppBarConfiguration
.Builder(R.id.your_fragment2_id,R.id.any_other_ids_you_want)
.build()
then setup your toolbar like this
setupActionBarWithNavController(this, yourNavController, appBarConfiguration)
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