4月23日

这是具体的viewpager的adapdter的代码，棘突怎么实现有些神奇，不是很理解，按照视频教程一步步敲下来就成功了。
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.lifecycle.Lifecycle;
import androidx.viewpager2.adapter.FragmentStateAdapter;

import java.util.ArrayList;
import java.util.List;

public class MyFragmentPagerAdapter extends FragmentStateAdapter {
    List<Fragment> fragmentList=new ArrayList<>();
    public MyFragmentPagerAdapter(@NonNull FragmentManager fragmentManager, @NonNull Lifecycle lifecycle,List<Fragment> fragments) {
        super(fragmentManager, lifecycle);
        fragmentList=fragments;
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        return fragmentList.get(position);
    }

    @Override
    public int getItemCount() {
        return fragmentList.size();
    }
}