Android R8 not keep fragment used in FragmentContainerView

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My class of fragment is removed after build because of R8, but it is used in main_activity.xml in "androidx.fragment.app.FragmentContainerView". On open the app release i have error of class not found

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ianhanniballake On

As per this issue, automatically generating the proper keep rules for fragments used in FragmentContainerView requires you to use Android Gradle Plugin 4.1-alpha04 or higher.

Therefore you can either upgrade your Android Gradle Plugin version or add @Keep to manually keep your fragment.