Foggy day

When making app, we mostly use viewpager and tablayout, and appbar. Animation showing or hiding appbar in activity is not too difficult. But, Sometimes a slightly complicated UI bothers us. For example, there is a fragment A in the activity, and the AppBar, tablayout, and ViewPager ars in the A fragment. The VewPapger has fragments B, C, and D. In this structure what i want to do is an animation..