AndroidX navigation navigateUp twice

Question

I am using the new AndroidX navigation framework.

I have a few fragments all linked in a navigation chain.

FragmentA --> FragmentB --> FragmentC

FragmentC has a Cancel button that should send me up all the way back to FragmentA.

Should I do the following:
on FragmentC call the method:

 Navigation.findNavController(view).navigateUp();

then on FragmentB listen to some callback and using some passed parameter or argument trigger another navigateUp() function from FragmentB

or is there some method that will do the equivalent of navigateUpTwice()

score 20 · Accepted Answer · answered Nov 09 '19 at 13:23

20

What I ended up doing was

Navigation.findNavController(view).popBackStack(R.id.fragmant_a,false)

answered Nov 09 '19 at 13:23

Vasili Fedotov

1,091
14
31

Nik Mohammad · Answer 2 · 2022-09-29T17:20:20.107

In your navigation.xml file under the action that you have created to navigate to starting fragment (FragmentA in your case) add the following

<action
....
app:popUpTo="@id/fragmentA"
app:popUpToInclusive="false"/>

This will pop up all the fragments until FragmentA and will exclude FragmentA since popUpToInclusive is set to false.

Edit: The full form of your action under FragmentC tag of your navigation.xml file will be something similar to this:

<fragment
    android:id="@+id/FragmentC"
    android:name="com.yourdomain.FragmentC"
    android:label="FragmentC">
    <action
        android:id="@+id/action_fragmentC_to_fragmentA"
        app:destination="@id/fragmentA"
        app:popUpTo="@id/fragmentA"
        app:popUpToInclusive="false"/>
</fragment>

The missing piece here is the description of the way to get back to FragmentA. — heiligbasil, Sep 24 '22 at 04:49

score 3 · Answer 3 · answered Dec 15 '21 at 20:42

3

Try with this, it works for me.

findNavController().navigateUp()
findNavController().navigateUp()

answered Dec 15 '21 at 20:42

vibroto

188
1
5

1

This should be the accepted answer! – Hank Chan Jan 13 '22 at 07:00
This method does work, however I noticed that the performance was a bit worse. – heiligbasil Sep 24 '22 at 04:46

score 2 · Answer 4 · answered Oct 14 '18 at 18:42

2

You can set pop To FragmentA in your action from FragmentB --> FragmentC and when then you press back it goes to Fragment A instead of Fragment B

answered Oct 14 '18 at 18:42

shakil.k

1,623
5
17
27

3

But what if back button should got back to Fragment B but the cancel button should go back to Fragment A? – Morten Holmgaard Nov 08 '19 at 12:43
This is accurate. If only it had a bit more detail and some actual code snippets. – heiligbasil Sep 24 '22 at 04:47

score 0 · Answer 5 · answered Dec 20 '22 at 09:43

So I found myself in a situation where I had to navigateUp() twice, but with a twist: I could reach the view through several paths. Think of it like this:

Fragment A --> Fragment C --> Fragment D

Fragment B --> Fragment C --> Fragment D

In a normal situation, using the popTo xml attribute or the popBackStack() method would work. However it is unusable here. Fortunately, what you can do is:

val navController = NavHostFragment.findNavController(this)
navController.navigateUp()
navController.navigateUp

As other people have pointed out, this is absolutely not optimised performance-wise. In any situation where you can reach Fragment D through a single path, use popTo instead.

score 0 · Answer 6 · answered Apr 18 '23 at 14:09

If you have situation like @flagg10ma in his answer, you can get info about previous destination and then use its id in the popBackStack() call. Like this:

NavController navController = NavHostFragment.findNavController(this);
NavBackStackEntry prevEntry = navController.getPreviousBackStackEntry();
if (prevEntry == null) {
  // There is no previous destination, so just pop once normally
  navController.popBackStack();
  return;
}
// Pop to previous destination and then pop that destination too (as we use inclusive=true)
navController.popBackStack(prevEntry.getDestination().getId(), true);

AndroidX navigation navigateUp twice

6 Answers6