Viewpager in Android to switch between days endlessly

Question

I am currently making a app where students can view there lesson grid. The lessons are retrieved using a json file. Now the date changing is done via buttons in the actionba

Answer 1

I have fixed this problems a little time ago, this code is a bit based ont the answer from Kuffs but I dont't get the date in an array because it's a lot of performance to put a lot of days in array.

Summarry of code (1) The code makes a fragmentpager with around 10.000 pages in it. On main activity init the app set te current page in the middle(5000)

pager.setAdapter(new BootstrapPagerAdapter(getResources(), getSupportFragmentManager()));
        pager.setCurrentItem(5000, false);
        pager.post(new Runnable() {
                            public void run() {
                            pager.setCurrentItem(5000, false);
                        }
                    });
        pager.getAdapter().notifyDataSetChanged();
        pager.setOffscreenPageLimit(0);

Summary of code (2) in the bootstrappageradapter

The code looks what position the user has scrolled and looks for the date now

   DateTime pagerdate = DateTime.now(TimeZone.getDefault());
   DateTime days = pagerdate.plusDays(position - 5000);

e.g. user swiped five days next. position is 5003 so the sum is 5003-5000=3 days

the days count easily plus 3 days with date4j library (I highly recommend it!) then I make a new fragment with the date in its bundle!

public class BootstrapPagerAdapter extends FragmentPagerAdapter  {

/**
 * Create pager adapter
 *
 * @param resources
 * @param fragmentManager
 */
public BootstrapPagerAdapter(Resources resources, FragmentManager fragmentManager) {
    super(fragmentManager);
}

@Override
public int getCount() {
    return 10000;
}
@Override
public int getItemPosition(Object object){
    return FragmentStatePagerAdapter.POSITION_NONE;
}
@Override
public Fragment getItem(int position) {

    DateTime pagerdate = DateTime.now(TimeZone.getDefault());
    DateTime days = pagerdate.plusDays(position - 5000);

    Bundle bundle = new Bundle();
    bundle.putString("date", days.format("YYYY-MM-DD").toString());

    RoosterFragment roosterFragment = new RoosterFragment();
    roosterFragment.setArguments(bundle);

    return roosterFragment;
}
}

You could fake the endlessly count with more high numbers like year 0001 year 3999

Around the: 1.500.000 days believe me no one is gonna go this far all the way swiping! I've tried the a lot infinite examples but this is the only working example I think!

Upvote if it worked for you and don't be shy to ask for more examples or help with your app!

However it would be cool if someone got something like a really infinte viewpager without fake counts and so on ;)