in androidx.fragment.app.Fragment，setUserVisibleHint（）is Deprecated，and not executed,why？

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They just changed API in Fragments.

If you use this method to limit fragments lifecycle:

You can now set a max Lifecycle state for a Fragment by calling
setMaxLifecycle() on a FragmentTransaction. This replaces the now
deprecated setUserVisibleHint().

Source: https://developer.android.com/jetpack/androidx/releases/fragment#1.1.0-alpha07 .

If you need this method because you try to detect which fragment is currently visible in ViewPager. You can now just use onResume and onPause methods instead but before that you should change default behaviour in FragmentPagerAdapter constructor.

Like this:

FragmentPagerAdapter(fragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT)

Edit:
Because FragmentPagerAdapter is deprecated as well it is better to use ViewPager2 now.
In case of ViewPager2 it is default behaviour and we can use onResume and onPause methods to know which fragment is currently visible.

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