How I can retrieve current fragment in NavHostFragment?

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Reference to the displayed fragment (AndroidX):

java

public Fragment getForegroundFragment(){
    Fragment navHostFragment = getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);
    return navHostFragment == null ? null : navHostFragment.getChildFragmentManager().getFragments().get(0);
}

kotlin

val navHostFragment: Fragment? =
        supportFragmentManager.findFragmentById(R.id.nav_host_fragment)
navHostFragment?.childFragmentManager?.fragments?.get(0)

Here nav_host_fragment is an ID
of the fragment tag in your activity_main.xml with android:name="androidx.navigation.fragment.NavHostFragment"

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