InfinitePhotosPagerAdapter

InfinitePhotosPagerAdapter.java

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;

import java.util.List;

/**
 * @author Yundin Vladislav
 */
public class InfinitePhotosPagerAdapter extends PhotosPagerAdapter {

    FragmentManager fragmentManager;

    public InfinitePhotosPagerAdapter(FragmentManager fm) {
        super(fm);
        this.fragmentManager = fm;
    }
    public InfinitePhotosPagerAdapter(FragmentManager fm, List<PhotoFragment> fragments) {
        super(fm, fragments);
        this.fragmentManager = fm;
    }

    @Override
    public Fragment getItem(int position) {
        return PhotoFragment.newInstance(fragments.get(position % fragments.size()).getImageUrl());
    }

    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }
}

PhotosPagerAdapter.java

import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

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

/**
 * @author Yundin Vladislav
 */
public class PhotosPagerAdapter extends FragmentPagerAdapter {

    List<PhotoFragment> fragments = new ArrayList<>();

    public PhotosPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    public PhotosPagerAdapter(FragmentManager fm, List<PhotoFragment> fragments) {
        super(fm);
        this.fragments = fragments;
    }

    @Override
    public Fragment getItem(int position) {
        return fragments.get(position);
    }

    // notifyDataSetChanged doesn't work correctly without this code
    public int getItemPosition(@NonNull Object object) {
        return POSITION_NONE;
    }

    @Override
    public int getCount() {
        return fragments.size();
    }

    public void replacePhotos(List<PhotoFragment> fragments) {
        this.fragments.clear();
        this.fragments.addAll(fragments);
        notifyDataSetChanged();
    }
}