In Androidx.Fragment.App.Fragment，Setuservisiblehint（）Is Deprecated，And Not Executed,Why

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

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.

Load data when setUserVisibleHint is deprecated in AndroidX

You can use onResume and onPause methods instead of setUserVisibleHint. For this you have to change default behaviour in FragmentPagerAdapter constructor.

FragmentPagerAdapter(fragmentManager, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT)

Checkout this https://developer.android.com/reference/androidx/fragment/app/FragmentPagerAdapter#BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT

How to determine when Fragment becomes visible in ViewPager

How to determine when Fragment becomes visible in ViewPager

You can do the following by overriding setUserVisibleHint in your Fragment:

public class MyFragment extends Fragment {
    @Override
    public void setUserVisibleHint(boolean isVisibleToUser) {
        super.setUserVisibleHint(isVisibleToUser);
        if (isVisibleToUser) {
        }
        else {
        }
    }
}

Android Fragment with ViewPager and SectionsPageAdapter method executed on user clicks tab name to display it or swipes to it

That's because ViewPager loads some fragments on the left side and on the right side of the current fragment. By default, ViewPager loads one on the left side and one on the right side of the fragment. You can change the number via: viewpager.setOfScreenPageLimit(int);

What you thinking is working exactly the same way in androidx's Fragment. Means onPause and onResume will call accordingly. So the first suggestion is to use androix. Check this answer: https://stackoverflow.com/a/57886441/7682257

For some reason, If you do not want to use androidx then in your Fragment, override setUserVisibleHint method, which gives you isVisibleToUser as a parameter.

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