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https://developer.android.com/reference/android/support/design/widget/FloatingActionButton.OnVisibilityChangedListener?authuser=7 FloatingActionButton.OnVisibilityChangedListener | API reference | Android Developers api reference android developers https://developer.android.com/reference/com/google/android/material/floatingactionbutton/FloatingActionButton.OnVisibilityChangedListener?authuser=0 FloatingActionButton.OnVisibilityChangedListener | API reference | Android Developers api reference android developers