IssueTracker

Component used: leanback Version used: 1.0.0-alpha05 Devices/Android versions reproduced on: all

GuidedStepSupportFragment never add shared elements before runing the shared element transition.

https://cs.android.com/androidx/platform/frameworks/support/+/androidx-master-dev:leanback/leanback/src/main/java/androidx/leanback/app/GuidedStepSupportFragment.java;l=555;bpv=0

    private static void addNonNullSharedElementTransition (FragmentTransaction ft, View subView,
                                                           String transitionName)
    {
        if (IS_FRAMEWORK_FRAGMENT && Build.VERSION.SDK_INT >= 21) {
            if (subView != null) {
                ft.addSharedElement(subView, transitionName);
            }
        }
    }

Since IS_FRAMEWORK_FRAGMENT == false, so addNonNullSharedElementTransition is actually doing nothing.