IssueTracker

Component used: Fragment

Version used: 1.3.0, 1.4.0. Does not reproduce on 1.2.5.

Devices/Android versions reproduced on: Android Emulator.

Issue description

Given the following navigation graph:

<?xml version="1.0" encoding="utf-8"?>
<navigation xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/nav_graph"
    app:startDestination="@id/AFragment">

    <fragment
        android:id="@+id/AFragment"
        android:name="com.example.navigationanimationtest.AFragment"
        tools:layout="@layout/fragment_a">

        <action
            android:id="@+id/action_fragmentA_to_fragmentB"
            app:enterAnim="@anim/slide_in_from_right"
            app:exitAnim="@anim/slide_out_to_left"
            app:destination="@id/BFragment" />

    </fragment>

    <fragment
        android:id="@+id/BFragment"
        android:name="com.example.navigationanimationtest.BFragment"
        tools:layout="@layout/fragment_b">

        <action
            android:id="@+id/action_fragmentB_to_fragmentC"
            app:enterAnim="@anim/fadein"
            app:exitAnim="@anim/fadeout"
            app:destination="@id/CFragment"
            app:popUpTo="@id/AFragment" />

    </fragment>

    <fragment
        android:id="@+id/CFragment"
        android:name="com.example.navigationanimationtest.CFragment"
        tools:layout="@layout/fragment_c" />

</navigation>

Expected result:

I expect the following transition for the action action_fragmentB_to_fragmentC:

• B exists with @anim/fadeout
• C enters with @anim/fadein

See expected.mp4 attachment.

This is what actually happens with fragment:1.2.5, but is broken in 1.3.0 and 1.4.0.

Actual result

From fragment:1.3.0 onwards, what happens is that, when app:popUpTo="A" is used, and while A is in the backstack, the transition for the action action_fragmentB_to_fragmentC is different:

• B exists with @anim/slide_out_to_left - Unexpected!
• C enters with @anim/fadein

It seems that the navigation component uses the exitAnim transition from the previously executed action, @id/action_fragmentA_to_fragmentB.

Removing app:popUpTo="A" from the action resolves the issue.

See actual.mp4 attachment.

Reproducer

Attached minimal reproducer project: NavigationAnimationTest.zip.

For swapping fragment versions, comment/uncomment the following app/build.gradle lines:

configurations.all {
    resolutionStrategy {
//        force 'androidx.fragment:fragment:1.2.5' // -- works
        force 'androidx.fragment:fragment:1.4.0' // -- broken
    }
}