Wrong 2nd argument type , Found 'androidx.lifecycle.Lifecycle', required 'int' Error

Question

I'm getting this error when trying to implement a viewpager2

here is the relevant code:

public class ViewPagerAdapter extends FragmentPagerAdapter {
private Fragment[] childFragments;
public ViewPagerAdapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle) {
    super(fragmentManager, lifecycle);

}
public ViewPagerAdapter(FragmentManager fm) {
    super(fm);
    childFragments = new Fragment[] {
            new user_fragment(), //0
            new zayyd(), //1
            new chat() //2
    };
}

Answer 1

the FragmentPagerAdapter class may has only a 2 parameters constructor FragmentPagerAdapter(FragmentManager, int), so the sub class cannot super(FragmentManager, Lifecycle).

You can create another constructor in FragmentPagerAdapter that accept (FragmentManager, Lifecycle) or create another contructor in ViewPagerAdapter that use (FragmentManager, int)