Disable adding fragment to backstack in Navigation Architecture Component

Question

Suppose i have 4 fragments: A, B, C, X, and I can navigate between them in this way:

... -> A -> C -> X    and ... -> B -> C -> X

But when I'm in fragment X call mNavController.navigateUp() I want skip fragment C and go to fragment A or B. What I need to do?

UPD: I need solution only for Navigation Architecture Component https://developer.android.com/topic/libraries/architecture/navigation/ Thanks!

score 30 · Answer 1 · answered Mar 18 '19 at 07:19

Alternatively you could use app:popUpTo and app:popUpToInclusive attributes in navigation xml resource to cleanup back stack automatically when perform certain transactions, so back / up button will bring your user to the root fragment.

<fragment
    android:id="@+id/fragment1"
    android:name="com.package.Fragment1"
    android:label="Fragment 1">

    <action
        android:id="@+id/action_fragment1_to_fragment2"
        app:destination="@id/fragment2"
        app:popUpTo="@id/fragment1"
        app:popUpToInclusive="true / false" />

</fragment>

Simple and sophisticated! – Abdul Waheed Jan 12 '21 at 10:46 — Abdul Waheed, Jan 12 '21 at 10:46

score 24 · Accepted Answer · edited Feb 28 '19 at 05:57

24

Given R.id.fragmentC is the name of C destination, from X destination, you can do the following:

NavController controller = Navigation.findNavController(view);
controller.popBackStack(R.id.fragmentC, true);

This should pop all destinations off the stack until before C, and leave either A or B on top of the stack.

edited Feb 28 '19 at 05:57

Reaz Murshed

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answered Sep 27 '18 at 17:00

bentesha

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2

That is ok if you are navigating programmatically what if you're using bottomNavigation view to navigate to other fragments – Odai A. Ali Mar 12 '20 at 07:44
@Robotec did you find a solution to this error via bottom navigation? – Thomas Oct 08 '20 at 23:19
This is not the same thing as disabling adding specific fragment to backstack with popping them all. – Serdar Samancıoğlu Sep 30 '21 at 11:34

score 5 · Answer 3 · answered Feb 05 '19 at 14:18

5

As mentioned by @bentesha this works in this way that it will pop fragments until fragmentC inclusively.

You can also achieve this as below:

NavController controller = Navigation.findNavController(view);
controller.popBackStack(R.id.fragmentA, false);

OR

NavController controller = Navigation.findNavController(view);
controller.popBackStack(R.id.fragmentB, false);

And this will pop up to fragmentA/fragmentB exclusively, I think it's most descriptive way for yourself and for others to understand.

answered Feb 05 '19 at 14:18

Muhammad Maqsood

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What if there were dynamically changing locations the user could navigate in from? (for example, there are destinations A, B, X, Y, Z. How could we identify which one was navigated from in order to navigate back to it dynamically? – Thomas Oct 09 '20 at 12:07

Disable adding fragment to backstack in Navigation Architecture Component

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