Wie mache ich, dass ein ViewPager sowohl horizontal als auch vertikal scrollt?

viewPager = (ViewPager) findViewById(R.id.pager);
        PagerAdapter adapter = new PagerAdapter
                (getSupportFragmentManager(), tabLayout.getTabCount(), viewPager, c);
        viewPager.setAdapter(adapter);
        viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
        tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }


            @Override
            public void onTabUnselected(TabLayout.Tab tab) {


            }


            @Override
            public void onTabReselected(TabLayout.Tab tab) {


            }
        });

package de.ubik.kalender;


/**
 * Created by ubik on 31.05.17.
 */




import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentStatePagerAdapter;
import android.support.v4.view.ViewPager;


import java.util.Calendar;


public class PagerAdapter extends FragmentStatePagerAdapter {
    int mNumOfTabs;




    ViewPager v;
    Calendar c;
    DayFragment tab1;
    WeekFragment tab2;
    MonthFragment tab3;
    YearFragment tab4;
    TasksFragment tab5;


    public PagerAdapter(FragmentManager fm, int NumOfTabs, ViewPager v, Calendar c) {
        super(fm);
        this.mNumOfTabs = NumOfTabs;
        this.c = c;
        this.v = v;
    }


    @Override
    public Fragment getItem(int position) {


        switch (position) {
            case 0:
                this.tab1 = new DayFragment(v, this, this.c);
                return tab1;
            case 1:
                this.tab2 = new WeekFragment();
                return tab2;
            case 2:
                this.tab3 = new MonthFragment();
                return tab3;
            case 3:
                this.tab4 = new YearFragment();
                return tab4;
            case 4:
                this.tab5 = new TasksFragment();
                return tab5;
            default:
                return null;
        }
    }


    @Override
    public int getCount() {
        return mNumOfTabs;
    }
}